Sync with the latest Gnulib code (6f2d632)

1 files changed, 599 insertions, 445 deletions

diff --git a/gl/m4/printf.m4 b/gl/m4/printf.m4
index b31efe3e..ef44f785 100644
--- a/gl/m4/printf.m4
+++ b/gl/m4/printf.m4
@@ -1,5 +1,5 @@
-# printf.m4 serial 34
-dnl Copyright (C) 2003, 2007-2010 Free Software Foundation, Inc.
+# printf.m4 serial 50
+dnl Copyright (C) 2003, 2007-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -17,7 +17,8 @@ AC_DEFUN([gl_PRINTF_SIZES_C99],
   AC_CACHE_CHECK([whether printf supports size specifiers as in C99],
     [gl_cv_func_printf_sizes_c99],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stddef.h>
 #include <stdio.h>
 #include <string.h>
@@ -31,53 +32,56 @@ AC_DEFUN([gl_PRINTF_SIZES_C99],
 static char buf[100];
 int main ()
 {
+  int result = 0;
 #if HAVE_STDINT_H_WITH_UINTMAX || HAVE_INTTYPES_H_WITH_UINTMAX
   buf[0] = '\0';
   if (sprintf (buf, "%ju %d", (uintmax_t) 12345671, 33, 44, 55) < 0
       || strcmp (buf, "12345671 33") != 0)
-    return 1;
+    result |= 1;
 #endif
   buf[0] = '\0';
   if (sprintf (buf, "%zu %d", (size_t) 12345672, 33, 44, 55) < 0
       || strcmp (buf, "12345672 33") != 0)
-    return 1;
+    result |= 2;
   buf[0] = '\0';
   if (sprintf (buf, "%tu %d", (ptrdiff_t) 12345673, 33, 44, 55) < 0
       || strcmp (buf, "12345673 33") != 0)
-    return 1;
+    result |= 4;
   buf[0] = '\0';
   if (sprintf (buf, "%Lg %d", (long double) 1.5, 33, 44, 55) < 0
       || strcmp (buf, "1.5 33") != 0)
-    return 1;
-  return 0;
-}], [gl_cv_func_printf_sizes_c99=yes], [gl_cv_func_printf_sizes_c99=no],
-      [
+    result |= 8;
+  return result;
+}]])],
+        [gl_cv_func_printf_sizes_c99=yes],
+        [gl_cv_func_printf_sizes_c99=no],
+        [
 changequote(,)dnl
-       case "$host_os" in
-                               # Guess yes on glibc systems.
-         *-gnu*)               gl_cv_func_printf_sizes_c99="guessing yes";;
-                               # Guess yes on FreeBSD >= 5.
-         freebsd[1-4]*)        gl_cv_func_printf_sizes_c99="guessing no";;
-         freebsd* | kfreebsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
-                               # Guess yes on MacOS X >= 10.3.
-         darwin[1-6].*)        gl_cv_func_printf_sizes_c99="guessing no";;
-         darwin*)              gl_cv_func_printf_sizes_c99="guessing yes";;
-                               # Guess yes on OpenBSD >= 3.9.
-         openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
-                               gl_cv_func_printf_sizes_c99="guessing no";;
-         openbsd*)             gl_cv_func_printf_sizes_c99="guessing yes";;
-                               # Guess yes on Solaris >= 2.10.
-         solaris2.[0-9]*)      gl_cv_func_printf_sizes_c99="guessing no";;
-         solaris*)             gl_cv_func_printf_sizes_c99="guessing yes";;
-                               # Guess yes on NetBSD >= 3.
-         netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
-                               gl_cv_func_printf_sizes_c99="guessing no";;
-         netbsd*)              gl_cv_func_printf_sizes_c99="guessing yes";;
-                               # If we don't know, assume the worst.
-         *)                    gl_cv_func_printf_sizes_c99="guessing no";;
-       esac
+         case "$host_os" in
+                                 # Guess yes on glibc systems.
+           *-gnu*)               gl_cv_func_printf_sizes_c99="guessing yes";;
+                                 # Guess yes on FreeBSD >= 5.
+           freebsd[1-4]*)        gl_cv_func_printf_sizes_c99="guessing no";;
+           freebsd* | kfreebsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
+                                 # Guess yes on Mac OS X >= 10.3.
+           darwin[1-6].*)        gl_cv_func_printf_sizes_c99="guessing no";;
+           darwin*)              gl_cv_func_printf_sizes_c99="guessing yes";;
+                                 # Guess yes on OpenBSD >= 3.9.
+           openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
+                                 gl_cv_func_printf_sizes_c99="guessing no";;
+           openbsd*)             gl_cv_func_printf_sizes_c99="guessing yes";;
+                                 # Guess yes on Solaris >= 2.10.
+           solaris2.[1-9][0-9]*) gl_cv_func_printf_sizes_c99="guessing yes";;
+           solaris*)             gl_cv_func_printf_sizes_c99="guessing no";;
+                                 # Guess yes on NetBSD >= 3.
+           netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
+                                 gl_cv_func_printf_sizes_c99="guessing no";;
+           netbsd*)              gl_cv_func_printf_sizes_c99="guessing yes";;
+                                 # If we don't know, assume the worst.
+           *)                    gl_cv_func_printf_sizes_c99="guessing no";;
+         esac
 changequote([,])dnl
-      ])
+        ])
     ])
 ])
 
@@ -92,35 +96,39 @@ AC_DEFUN([gl_PRINTF_LONG_DOUBLE],
   AC_CACHE_CHECK([whether printf supports 'long double' arguments],
     [gl_cv_func_printf_long_double],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <string.h>
 static char buf[10000];
 int main ()
 {
+  int result = 0;
   buf[0] = '\0';
   if (sprintf (buf, "%Lf %d", 1.75L, 33, 44, 55) < 0
       || strcmp (buf, "1.750000 33") != 0)
-    return 1;
+    result |= 1;
   buf[0] = '\0';
   if (sprintf (buf, "%Le %d", 1.75L, 33, 44, 55) < 0
       || strcmp (buf, "1.750000e+00 33") != 0)
-    return 1;
+    result |= 2;
   buf[0] = '\0';
   if (sprintf (buf, "%Lg %d", 1.75L, 33, 44, 55) < 0
       || strcmp (buf, "1.75 33") != 0)
-    return 1;
-  return 0;
-}], [gl_cv_func_printf_long_double=yes], [gl_cv_func_printf_long_double=no],
-      [
+    result |= 4;
+  return result;
+}]])],
+        [gl_cv_func_printf_long_double=yes],
+        [gl_cv_func_printf_long_double=no],
+        [
 changequote(,)dnl
-       case "$host_os" in
-         beos*)        gl_cv_func_printf_long_double="guessing no";;
-         mingw* | pw*) gl_cv_func_printf_long_double="guessing no";;
-         *)            gl_cv_func_printf_long_double="guessing yes";;
-       esac
+         case "$host_os" in
+           beos*)        gl_cv_func_printf_long_double="guessing no";;
+           mingw* | pw*) gl_cv_func_printf_long_double="guessing no";;
+           *)            gl_cv_func_printf_long_double="guessing yes";;
+         esac
 changequote([,])dnl
-      ])
+        ])
     ])
 ])
 
@@ -136,7 +144,8 @@ AC_DEFUN([gl_PRINTF_INFINITE],
   AC_CACHE_CHECK([whether printf supports infinite 'double' arguments],
     [gl_cv_func_printf_infinite],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <string.h>
 static int
@@ -168,65 +177,68 @@ static char buf[10000];
 static double zero = 0.0;
 int main ()
 {
-  if (sprintf (buf, "%f", 1.0 / 0.0) < 0
+  int result = 0;
+  if (sprintf (buf, "%f", 1.0 / zero) < 0
       || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
-    return 1;
-  if (sprintf (buf, "%f", -1.0 / 0.0) < 0
+    result |= 1;
+  if (sprintf (buf, "%f", -1.0 / zero) < 0
       || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
-    return 1;
+    result |= 1;
   if (sprintf (buf, "%f", zero / zero) < 0
       || !strisnan (buf, 0, strlen (buf)))
-    return 1;
-  if (sprintf (buf, "%e", 1.0 / 0.0) < 0
+    result |= 2;
+  if (sprintf (buf, "%e", 1.0 / zero) < 0
       || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
-    return 1;
-  if (sprintf (buf, "%e", -1.0 / 0.0) < 0
+    result |= 4;
+  if (sprintf (buf, "%e", -1.0 / zero) < 0
       || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
-    return 1;
+    result |= 4;
   if (sprintf (buf, "%e", zero / zero) < 0
       || !strisnan (buf, 0, strlen (buf)))
-    return 1;
-  if (sprintf (buf, "%g", 1.0 / 0.0) < 0
+    result |= 8;
+  if (sprintf (buf, "%g", 1.0 / zero) < 0
       || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
-    return 1;
-  if (sprintf (buf, "%g", -1.0 / 0.0) < 0
+    result |= 16;
+  if (sprintf (buf, "%g", -1.0 / zero) < 0
       || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
-    return 1;
+    result |= 16;
   if (sprintf (buf, "%g", zero / zero) < 0
       || !strisnan (buf, 0, strlen (buf)))
-    return 1;
+    result |= 32;
   /* This test fails on HP-UX 10.20.  */
   if (have_minus_zero ())
     if (sprintf (buf, "%g", - zero) < 0
         || strcmp (buf, "-0") != 0)
-    return 1;
-  return 0;
-}], [gl_cv_func_printf_infinite=yes], [gl_cv_func_printf_infinite=no],
-      [
+    result |= 64;
+  return result;
+}]])],
+        [gl_cv_func_printf_infinite=yes],
+        [gl_cv_func_printf_infinite=no],
+        [
 changequote(,)dnl
-       case "$host_os" in
-                               # Guess yes on glibc systems.
-         *-gnu*)               gl_cv_func_printf_infinite="guessing yes";;
-                               # Guess yes on FreeBSD >= 6.
-         freebsd[1-5]*)        gl_cv_func_printf_infinite="guessing no";;
-         freebsd* | kfreebsd*) gl_cv_func_printf_infinite="guessing yes";;
-                               # Guess yes on MacOS X >= 10.3.
-         darwin[1-6].*)        gl_cv_func_printf_infinite="guessing no";;
-         darwin*)              gl_cv_func_printf_infinite="guessing yes";;
-                               # Guess yes on HP-UX >= 11.
-         hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite="guessing no";;
-         hpux*)                gl_cv_func_printf_infinite="guessing yes";;
-                               # Guess yes on NetBSD >= 3.
-         netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
-                               gl_cv_func_printf_infinite="guessing no";;
-         netbsd*)              gl_cv_func_printf_infinite="guessing yes";;
-                               # Guess yes on BeOS.
-         beos*)                gl_cv_func_printf_infinite="guessing yes";;
-                               # If we don't know, assume the worst.
-         *)                    gl_cv_func_printf_infinite="guessing no";;
-       esac
+         case "$host_os" in
+                                 # Guess yes on glibc systems.
+           *-gnu*)               gl_cv_func_printf_infinite="guessing yes";;
+                                 # Guess yes on FreeBSD >= 6.
+           freebsd[1-5]*)        gl_cv_func_printf_infinite="guessing no";;
+           freebsd* | kfreebsd*) gl_cv_func_printf_infinite="guessing yes";;
+                                 # Guess yes on Mac OS X >= 10.3.
+           darwin[1-6].*)        gl_cv_func_printf_infinite="guessing no";;
+           darwin*)              gl_cv_func_printf_infinite="guessing yes";;
+                                 # Guess yes on HP-UX >= 11.
+           hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite="guessing no";;
+           hpux*)                gl_cv_func_printf_infinite="guessing yes";;
+                                 # Guess yes on NetBSD >= 3.
+           netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
+                                 gl_cv_func_printf_infinite="guessing no";;
+           netbsd*)              gl_cv_func_printf_infinite="guessing yes";;
+                                 # Guess yes on BeOS.
+           beos*)                gl_cv_func_printf_infinite="guessing yes";;
+                                 # If we don't know, assume the worst.
+           *)                    gl_cv_func_printf_infinite="guessing no";;
+         esac
 changequote([,])dnl
-      ])
+        ])
     ])
 ])
 
@@ -239,6 +251,7 @@ AC_DEFUN([gl_PRINTF_INFINITE_LONG_DOUBLE],
   AC_REQUIRE([gl_PRINTF_LONG_DOUBLE])
   AC_REQUIRE([AC_PROG_CC])
   AC_REQUIRE([gl_BIGENDIAN])
+  AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   dnl The user can set or unset the variable gl_printf_safe to indicate
   dnl that he wishes a safe handling of non-IEEE-754 'long double' values.
@@ -252,7 +265,8 @@ AC_DEFUN([gl_PRINTF_INFINITE_LONG_DOUBLE],
       AC_CACHE_CHECK([whether printf supports infinite 'long double' arguments],
         [gl_cv_func_printf_infinite_long_double],
         [
-          AC_TRY_RUN([
+          AC_RUN_IFELSE(
+            [AC_LANG_SOURCE([[
 ]GL_NOCRASH[
 #include <float.h>
 #include <stdio.h>
@@ -279,35 +293,36 @@ static char buf[10000];
 static long double zeroL = 0.0L;
 int main ()
 {
+  int result = 0;
   nocrash_init();
-  if (sprintf (buf, "%Lf", 1.0L / 0.0L) < 0
+  if (sprintf (buf, "%Lf", 1.0L / zeroL) < 0
       || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
-    return 1;
-  if (sprintf (buf, "%Lf", -1.0L / 0.0L) < 0
+    result |= 1;
+  if (sprintf (buf, "%Lf", -1.0L / zeroL) < 0
       || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
-    return 1;
+    result |= 1;
   if (sprintf (buf, "%Lf", zeroL / zeroL) < 0
       || !strisnan (buf, 0, strlen (buf)))
-    return 1;
-  if (sprintf (buf, "%Le", 1.0L / 0.0L) < 0
+    result |= 1;
+  if (sprintf (buf, "%Le", 1.0L / zeroL) < 0
       || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
-    return 1;
-  if (sprintf (buf, "%Le", -1.0L / 0.0L) < 0
+    result |= 1;
+  if (sprintf (buf, "%Le", -1.0L / zeroL) < 0
       || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
-    return 1;
+    result |= 1;
   if (sprintf (buf, "%Le", zeroL / zeroL) < 0
       || !strisnan (buf, 0, strlen (buf)))
-    return 1;
-  if (sprintf (buf, "%Lg", 1.0L / 0.0L) < 0
+    result |= 1;
+  if (sprintf (buf, "%Lg", 1.0L / zeroL) < 0
       || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
-    return 1;
-  if (sprintf (buf, "%Lg", -1.0L / 0.0L) < 0
+    result |= 1;
+  if (sprintf (buf, "%Lg", -1.0L / zeroL) < 0
       || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
-    return 1;
+    result |= 1;
   if (sprintf (buf, "%Lg", zeroL / zeroL) < 0
       || !strisnan (buf, 0, strlen (buf)))
-    return 1;
-#if CHECK_PRINTF_SAFE && ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
+    result |= 1;
+#if CHECK_PRINTF_SAFE && ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_)) && !HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
 /* Representation of an 80-bit 'long double' as an initializer for a sequence
    of 'unsigned int' words.  */
 # ifdef WORDS_BIGENDIAN
@@ -325,13 +340,13 @@ int main ()
       { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
     if (sprintf (buf, "%Lf", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 2;
     if (sprintf (buf, "%Le", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 2;
     if (sprintf (buf, "%Lg", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 2;
   }
   {
     /* Signalling NaN.  */
@@ -339,113 +354,106 @@ int main ()
       { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
     if (sprintf (buf, "%Lf", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 2;
     if (sprintf (buf, "%Le", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 2;
     if (sprintf (buf, "%Lg", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 2;
   }
   { /* Pseudo-NaN.  */
     static union { unsigned int word[4]; long double value; } x =
       { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
     if (sprintf (buf, "%Lf", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 4;
     if (sprintf (buf, "%Le", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 4;
     if (sprintf (buf, "%Lg", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 4;
   }
   { /* Pseudo-Infinity.  */
     static union { unsigned int word[4]; long double value; } x =
       { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
     if (sprintf (buf, "%Lf", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 8;
     if (sprintf (buf, "%Le", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 8;
     if (sprintf (buf, "%Lg", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 8;
   }
   { /* Pseudo-Zero.  */
     static union { unsigned int word[4]; long double value; } x =
       { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
     if (sprintf (buf, "%Lf", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 16;
     if (sprintf (buf, "%Le", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 16;
     if (sprintf (buf, "%Lg", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 16;
   }
   { /* Unnormalized number.  */
     static union { unsigned int word[4]; long double value; } x =
       { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
     if (sprintf (buf, "%Lf", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 32;
     if (sprintf (buf, "%Le", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 32;
     if (sprintf (buf, "%Lg", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 32;
   }
   { /* Pseudo-Denormal.  */
     static union { unsigned int word[4]; long double value; } x =
       { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
     if (sprintf (buf, "%Lf", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 64;
     if (sprintf (buf, "%Le", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 64;
     if (sprintf (buf, "%Lg", x.value) < 0
         || !strisnan (buf, 0, strlen (buf)))
-      return 1;
+      result |= 64;
   }
 #endif
-  return 0;
-}],
-          [gl_cv_func_printf_infinite_long_double=yes],
-          [gl_cv_func_printf_infinite_long_double=no],
-          [
+  return result;
+}]])],
+            [gl_cv_func_printf_infinite_long_double=yes],
+            [gl_cv_func_printf_infinite_long_double=no],
+            [
 changequote(,)dnl
-           case "$host_cpu" in
-                                   # Guess no on ia64, x86_64, i386.
-             ia64 | x86_64 | i*86) gl_cv_func_printf_infinite_long_double="guessing no";;
-             *)
-               case "$host_os" in
-                                       # Guess yes on glibc systems.
-                 *-gnu*)               gl_cv_func_printf_infinite_long_double="guessing yes";;
-                                       # Guess yes on FreeBSD >= 6.
-                 freebsd[1-5]*)        gl_cv_func_printf_infinite_long_double="guessing no";;
-                 freebsd* | kfreebsd*) gl_cv_func_printf_infinite_long_double="guessing yes";;
-                                       # Guess yes on MacOS X >= 10.3.
-                 darwin[1-6].*)        gl_cv_func_printf_infinite_long_double="guessing no";;
-                 darwin*)              gl_cv_func_printf_infinite_long_double="guessing yes";;
-                                       # Guess yes on HP-UX >= 11.
-                 hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite_long_double="guessing no";;
-                 hpux*)                gl_cv_func_printf_infinite_long_double="guessing yes";;
-                                       # Guess yes on NetBSD >= 3.
-                 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
-                                       gl_cv_func_printf_infinite_long_double="guessing no";;
-                 netbsd*)              gl_cv_func_printf_infinite_long_double="guessing yes";;
-                                       # If we don't know, assume the worst.
-                 *)                    gl_cv_func_printf_infinite_long_double="guessing no";;
-               esac
-               ;;
-           esac
+             case "$host_cpu" in
+                                     # Guess no on ia64, x86_64, i386.
+               ia64 | x86_64 | i*86) gl_cv_func_printf_infinite_long_double="guessing no";;
+               *)
+                 case "$host_os" in
+                                         # Guess yes on glibc systems.
+                   *-gnu*)               gl_cv_func_printf_infinite_long_double="guessing yes";;
+                                         # Guess yes on FreeBSD >= 6.
+                   freebsd[1-5]*)        gl_cv_func_printf_infinite_long_double="guessing no";;
+                   freebsd* | kfreebsd*) gl_cv_func_printf_infinite_long_double="guessing yes";;
+                                         # Guess yes on HP-UX >= 11.
+                   hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite_long_double="guessing no";;
+                   hpux*)                gl_cv_func_printf_infinite_long_double="guessing yes";;
+                                         # If we don't know, assume the worst.
+                   *)                    gl_cv_func_printf_infinite_long_double="guessing no";;
+                 esac
+                 ;;
+             esac
 changequote([,])dnl
-          ])
+            ])
         ])
       ;;
     *)
@@ -466,72 +474,77 @@ AC_DEFUN([gl_PRINTF_DIRECTIVE_A],
   AC_CACHE_CHECK([whether printf supports the 'a' and 'A' directives],
     [gl_cv_func_printf_directive_a],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <string.h>
 static char buf[100];
+static double zero = 0.0;
 int main ()
 {
+  int result = 0;
   if (sprintf (buf, "%a %d", 3.1416015625, 33, 44, 55) < 0
       || (strcmp (buf, "0x1.922p+1 33") != 0
           && strcmp (buf, "0x3.244p+0 33") != 0
           && strcmp (buf, "0x6.488p-1 33") != 0
           && strcmp (buf, "0xc.91p-2 33") != 0))
-    return 1;
+    result |= 1;
   if (sprintf (buf, "%A %d", -3.1416015625, 33, 44, 55) < 0
       || (strcmp (buf, "-0X1.922P+1 33") != 0
           && strcmp (buf, "-0X3.244P+0 33") != 0
           && strcmp (buf, "-0X6.488P-1 33") != 0
           && strcmp (buf, "-0XC.91P-2 33") != 0))
-    return 1;
+    result |= 2;
   /* This catches a FreeBSD 6.1 bug: it doesn't round.  */
   if (sprintf (buf, "%.2a %d", 1.51, 33, 44, 55) < 0
       || (strcmp (buf, "0x1.83p+0 33") != 0
           && strcmp (buf, "0x3.05p-1 33") != 0
           && strcmp (buf, "0x6.0ap-2 33") != 0
           && strcmp (buf, "0xc.14p-3 33") != 0))
-    return 1;
+    result |= 4;
   /* This catches a FreeBSD 6.1 bug.  See
      <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html> */
-  if (sprintf (buf, "%010a %d", 1.0 / 0.0, 33, 44, 55) < 0
+  if (sprintf (buf, "%010a %d", 1.0 / zero, 33, 44, 55) < 0
       || buf[0] == '0')
-    return 1;
-  /* This catches a MacOS X 10.3.9 (Darwin 7.9) bug.  */
+    result |= 8;
+  /* This catches a Mac OS X 10.3.9 (Darwin 7.9) bug.  */
   if (sprintf (buf, "%.1a", 1.999) < 0
       || (strcmp (buf, "0x1.0p+1") != 0
           && strcmp (buf, "0x2.0p+0") != 0
           && strcmp (buf, "0x4.0p-1") != 0
           && strcmp (buf, "0x8.0p-2") != 0))
-    return 1;
-  /* This catches the same MacOS X 10.3.9 (Darwin 7.9) bug and also a
+    result |= 16;
+  /* This catches the same Mac OS X 10.3.9 (Darwin 7.9) bug and also a
      glibc 2.4 bug <http://sourceware.org/bugzilla/show_bug.cgi?id=2908>.  */
   if (sprintf (buf, "%.1La", 1.999L) < 0
       || (strcmp (buf, "0x1.0p+1") != 0
           && strcmp (buf, "0x2.0p+0") != 0
           && strcmp (buf, "0x4.0p-1") != 0
           && strcmp (buf, "0x8.0p-2") != 0))
-    return 1;
-  return 0;
-}], [gl_cv_func_printf_directive_a=yes], [gl_cv_func_printf_directive_a=no],
-      [
-       case "$host_os" in
-                               # Guess yes on glibc >= 2.5 systems.
-         *-gnu*)
-           AC_EGREP_CPP([BZ2908], [
-             #include <features.h>
-             #ifdef __GNU_LIBRARY__
-              #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 5) || (__GLIBC__ > 2)
-               BZ2908
-              #endif
-             #endif
-             ],
-             [gl_cv_func_printf_directive_a="guessing yes"],
-             [gl_cv_func_printf_directive_a="guessing no"])
-           ;;
-                               # If we don't know, assume the worst.
-         *)                    gl_cv_func_printf_directive_a="guessing no";;
-       esac
-      ])
+    result |= 32;
+  return result;
+}]])],
+        [gl_cv_func_printf_directive_a=yes],
+        [gl_cv_func_printf_directive_a=no],
+        [
+         case "$host_os" in
+                                 # Guess yes on glibc >= 2.5 systems.
+           *-gnu*)
+             AC_EGREP_CPP([BZ2908], [
+               #include <features.h>
+               #ifdef __GNU_LIBRARY__
+                #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 5) || (__GLIBC__ > 2)) && !defined __UCLIBC__
+                 BZ2908
+                #endif
+               #endif
+               ],
+               [gl_cv_func_printf_directive_a="guessing yes"],
+               [gl_cv_func_printf_directive_a="guessing no"])
+             ;;
+                                 # If we don't know, assume the worst.
+           *)                    gl_cv_func_printf_directive_a="guessing no";;
+         esac
+        ])
     ])
 ])
 
@@ -546,43 +559,48 @@ AC_DEFUN([gl_PRINTF_DIRECTIVE_F],
   AC_CACHE_CHECK([whether printf supports the 'F' directive],
     [gl_cv_func_printf_directive_f],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <string.h>
 static char buf[100];
+static double zero = 0.0;
 int main ()
 {
+  int result = 0;
   if (sprintf (buf, "%F %d", 1234567.0, 33, 44, 55) < 0
       || strcmp (buf, "1234567.000000 33") != 0)
-    return 1;
-  if (sprintf (buf, "%F", 1.0 / 0.0) < 0
+    result |= 1;
+  if (sprintf (buf, "%F", 1.0 / zero) < 0
       || (strcmp (buf, "INF") != 0 && strcmp (buf, "INFINITY") != 0))
-    return 1;
+    result |= 2;
   /* This catches a Cygwin 1.5.x bug.  */
   if (sprintf (buf, "%.F", 1234.0) < 0
       || strcmp (buf, "1234") != 0)
-    return 1;
-  return 0;
-}], [gl_cv_func_printf_directive_f=yes], [gl_cv_func_printf_directive_f=no],
-      [
+    result |= 4;
+  return result;
+}]])],
+        [gl_cv_func_printf_directive_f=yes],
+        [gl_cv_func_printf_directive_f=no],
+        [
 changequote(,)dnl
-       case "$host_os" in
-                               # Guess yes on glibc systems.
-         *-gnu*)               gl_cv_func_printf_directive_f="guessing yes";;
-                               # Guess yes on FreeBSD >= 6.
-         freebsd[1-5]*)        gl_cv_func_printf_directive_f="guessing no";;
-         freebsd* | kfreebsd*) gl_cv_func_printf_directive_f="guessing yes";;
-                               # Guess yes on MacOS X >= 10.3.
-         darwin[1-6].*)        gl_cv_func_printf_directive_f="guessing no";;
-         darwin*)              gl_cv_func_printf_directive_f="guessing yes";;
-                               # Guess yes on Solaris >= 2.10.
-         solaris2.[0-9]*)      gl_cv_func_printf_directive_f="guessing no";;
-         solaris*)             gl_cv_func_printf_directive_f="guessing yes";;
-                               # If we don't know, assume the worst.
-         *)                    gl_cv_func_printf_directive_f="guessing no";;
-       esac
+         case "$host_os" in
+                                 # Guess yes on glibc systems.
+           *-gnu*)               gl_cv_func_printf_directive_f="guessing yes";;
+                                 # Guess yes on FreeBSD >= 6.
+           freebsd[1-5]*)        gl_cv_func_printf_directive_f="guessing no";;
+           freebsd* | kfreebsd*) gl_cv_func_printf_directive_f="guessing yes";;
+                                 # Guess yes on Mac OS X >= 10.3.
+           darwin[1-6].*)        gl_cv_func_printf_directive_f="guessing no";;
+           darwin*)              gl_cv_func_printf_directive_f="guessing yes";;
+                                 # Guess yes on Solaris >= 2.10.
+           solaris2.[1-9][0-9]*) gl_cv_func_printf_sizes_c99="guessing yes";;
+           solaris*)             gl_cv_func_printf_sizes_c99="guessing no";;
+                                 # If we don't know, assume the worst.
+           *)                    gl_cv_func_printf_directive_f="guessing no";;
+         esac
 changequote([,])dnl
-      ])
+        ])
     ])
 ])
 
@@ -597,14 +615,30 @@ AC_DEFUN([gl_PRINTF_DIRECTIVE_N],
   AC_CACHE_CHECK([whether printf supports the 'n' directive],
     [gl_cv_func_printf_directive_n],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
+#ifdef _MSC_VER
+/* See page about "Parameter Validation" on msdn.microsoft.com.  */
+static void cdecl
+invalid_parameter_handler (const wchar_t *expression,
+                           const wchar_t *function,
+                           const wchar_t *file, unsigned int line,
+                           uintptr_t dummy)
+{
+  exit (1);
+}
+#endif
 static char fmtstring[10];
 static char buf[100];
 int main ()
 {
   int count = -1;
+#ifdef _MSC_VER
+  _set_invalid_parameter_handler (invalid_parameter_handler);
+#endif
   /* Copy the format string.  Some systems (glibc with _FORTIFY_SOURCE=2)
      support %n in format strings in read-only memory but not in writable
      memory.  */
@@ -614,14 +648,17 @@ int main ()
       || count != 4)
     return 1;
   return 0;
-}], [gl_cv_func_printf_directive_n=yes], [gl_cv_func_printf_directive_n=no],
-      [
+}]])],
+        [gl_cv_func_printf_directive_n=yes],
+        [gl_cv_func_printf_directive_n=no],
+        [
 changequote(,)dnl
-       case "$host_os" in
-         *)     gl_cv_func_printf_directive_n="guessing yes";;
-       esac
+         case "$host_os" in
+           mingw*) gl_cv_func_printf_directive_n="guessing no";;
+           *)      gl_cv_func_printf_directive_n="guessing yes";;
+         esac
 changequote([,])dnl
-      ])
+        ])
     ])
 ])
 
@@ -639,7 +676,8 @@ AC_DEFUN([gl_PRINTF_DIRECTIVE_LS],
   AC_CACHE_CHECK([whether printf supports the 'ls' directive],
     [gl_cv_func_printf_directive_ls],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
    <wchar.h>.
    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
@@ -651,6 +689,7 @@ AC_DEFUN([gl_PRINTF_DIRECTIVE_LS],
 #include <string.h>
 int main ()
 {
+  int result = 0;
   char buf[100];
   /* Test whether %ls works at all.
      This test fails on OpenBSD 4.0, IRIX 6.5, Solaris 2.6, Haiku, but not on
@@ -660,7 +699,7 @@ int main ()
     buf[0] = '\0';
     if (sprintf (buf, "%ls", wstring) < 0
         || strcmp (buf, "abc") != 0)
-      return 1;
+      result |= 1;
   }
   /* This test fails on IRIX 6.5, Solaris 2.6, Cygwin 1.5, Haiku (with an
      assertion failure inside libc), but not on OpenBSD 4.0.  */
@@ -669,7 +708,7 @@ int main ()
     buf[0] = '\0';
     if (sprintf (buf, "%ls", wstring) < 0
         || strcmp (buf, "a") != 0)
-      return 1;
+      result |= 2;
   }
   /* Test whether precisions in %ls are supported as specified in ISO C 99
      section 7.19.6.1:
@@ -684,22 +723,24 @@ int main ()
     buf[0] = '\0';
     if (sprintf (buf, "%.2ls", wstring) < 0
         || strcmp (buf, "ab") != 0)
-      return 1;
+      result |= 8;
   }
-  return 0;
-}], [gl_cv_func_printf_directive_ls=yes], [gl_cv_func_printf_directive_ls=no],
-      [
+  return result;
+}]])],
+        [gl_cv_func_printf_directive_ls=yes],
+        [gl_cv_func_printf_directive_ls=no],
+        [
 changequote(,)dnl
-       case "$host_os" in
-         openbsd*)        gl_cv_func_printf_directive_ls="guessing no";;
-         irix*)           gl_cv_func_printf_directive_ls="guessing no";;
-         solaris*)        gl_cv_func_printf_directive_ls="guessing no";;
-         cygwin*)         gl_cv_func_printf_directive_ls="guessing no";;
-         beos* | haiku*)  gl_cv_func_printf_directive_ls="guessing no";;
-         *)               gl_cv_func_printf_directive_ls="guessing yes";;
-       esac
+         case "$host_os" in
+           openbsd*)        gl_cv_func_printf_directive_ls="guessing no";;
+           irix*)           gl_cv_func_printf_directive_ls="guessing no";;
+           solaris*)        gl_cv_func_printf_directive_ls="guessing no";;
+           cygwin*)         gl_cv_func_printf_directive_ls="guessing no";;
+           beos* | haiku*)  gl_cv_func_printf_directive_ls="guessing no";;
+           *)               gl_cv_func_printf_directive_ls="guessing yes";;
+         esac
 changequote([,])dnl
-      ])
+        ])
     ])
 ])
 
@@ -714,7 +755,8 @@ AC_DEFUN([gl_PRINTF_POSITIONS],
   AC_CACHE_CHECK([whether printf supports POSIX/XSI format strings with positions],
     [gl_cv_func_printf_positions],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <string.h>
 /* The string "%2$d %1$d", with dollar characters protected from the shell's
@@ -725,18 +767,20 @@ int main ()
 {
   sprintf (buf, format, 33, 55);
   return (strcmp (buf, "55 33") != 0);
-}], [gl_cv_func_printf_positions=yes], [gl_cv_func_printf_positions=no],
-      [
+}]])],
+        [gl_cv_func_printf_positions=yes],
+        [gl_cv_func_printf_positions=no],
+        [
 changequote(,)dnl
-       case "$host_os" in
-         netbsd[1-3]* | netbsdelf[1-3]* | netbsdaout[1-3]* | netbsdcoff[1-3]*)
-                       gl_cv_func_printf_positions="guessing no";;
-         beos*)        gl_cv_func_printf_positions="guessing no";;
-         mingw* | pw*) gl_cv_func_printf_positions="guessing no";;
-         *)            gl_cv_func_printf_positions="guessing yes";;
-       esac
+         case "$host_os" in
+           netbsd[1-3]* | netbsdelf[1-3]* | netbsdaout[1-3]* | netbsdcoff[1-3]*)
+                         gl_cv_func_printf_positions="guessing no";;
+           beos*)        gl_cv_func_printf_positions="guessing no";;
+           mingw* | pw*) gl_cv_func_printf_positions="guessing no";;
+           *)            gl_cv_func_printf_positions="guessing yes";;
+         esac
 changequote([,])dnl
-      ])
+        ])
     ])
 ])
 
@@ -751,7 +795,8 @@ AC_DEFUN([gl_PRINTF_FLAG_GROUPING],
   AC_CACHE_CHECK([whether printf supports the grouping flag],
     [gl_cv_func_printf_flag_grouping],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <string.h>
 static char buf[100];
@@ -761,17 +806,19 @@ int main ()
       || buf[strlen (buf) - 1] != '9')
     return 1;
   return 0;
-}], [gl_cv_func_printf_flag_grouping=yes], [gl_cv_func_printf_flag_grouping=no],
-      [
+}]])],
+        [gl_cv_func_printf_flag_grouping=yes],
+        [gl_cv_func_printf_flag_grouping=no],
+        [
 changequote(,)dnl
-       case "$host_os" in
-         cygwin*)      gl_cv_func_printf_flag_grouping="guessing no";;
-         netbsd*)      gl_cv_func_printf_flag_grouping="guessing no";;
-         mingw* | pw*) gl_cv_func_printf_flag_grouping="guessing no";;
-         *)            gl_cv_func_printf_flag_grouping="guessing yes";;
-       esac
+         case "$host_os" in
+           cygwin*)      gl_cv_func_printf_flag_grouping="guessing no";;
+           netbsd*)      gl_cv_func_printf_flag_grouping="guessing no";;
+           mingw* | pw*) gl_cv_func_printf_flag_grouping="guessing no";;
+           *)            gl_cv_func_printf_flag_grouping="guessing yes";;
+         esac
 changequote([,])dnl
-      ])
+        ])
     ])
 ])
 
@@ -787,7 +834,8 @@ AC_DEFUN([gl_PRINTF_FLAG_LEFTADJUST],
   AC_CACHE_CHECK([whether printf supports the left-adjust flag correctly],
     [gl_cv_func_printf_flag_leftadjust],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <string.h>
 static char buf[100];
@@ -798,7 +846,7 @@ int main ()
       || strcmp (buf, "ab  c") != 0)
     return 1;
   return 0;
-}],
+}]])],
         [gl_cv_func_printf_flag_leftadjust=yes],
         [gl_cv_func_printf_flag_leftadjust=no],
         [
@@ -828,37 +876,44 @@ AC_DEFUN([gl_PRINTF_FLAG_ZERO],
   AC_CACHE_CHECK([whether printf supports the zero flag correctly],
     [gl_cv_func_printf_flag_zero],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <string.h>
 static char buf[100];
+static double zero = 0.0;
 int main ()
 {
-  if (sprintf (buf, "%010f", 1.0 / 0.0, 33, 44, 55) < 0
+  if (sprintf (buf, "%010f", 1.0 / zero, 33, 44, 55) < 0
       || (strcmp (buf, "       inf") != 0
           && strcmp (buf, "  infinity") != 0))
     return 1;
   return 0;
-}], [gl_cv_func_printf_flag_zero=yes], [gl_cv_func_printf_flag_zero=no],
-      [
+}]])],
+        [gl_cv_func_printf_flag_zero=yes],
+        [gl_cv_func_printf_flag_zero=no],
+        [
 changequote(,)dnl
-       case "$host_os" in
-                 # Guess yes on glibc systems.
-         *-gnu*) gl_cv_func_printf_flag_zero="guessing yes";;
-                 # Guess yes on BeOS.
-         beos*)  gl_cv_func_printf_flag_zero="guessing yes";;
-                 # If we don't know, assume the worst.
-         *)      gl_cv_func_printf_flag_zero="guessing no";;
-       esac
+         case "$host_os" in
+                   # Guess yes on glibc systems.
+           *-gnu*) gl_cv_func_printf_flag_zero="guessing yes";;
+                   # Guess yes on BeOS.
+           beos*)  gl_cv_func_printf_flag_zero="guessing yes";;
+                   # If we don't know, assume the worst.
+           *)      gl_cv_func_printf_flag_zero="guessing no";;
+         esac
 changequote([,])dnl
-      ])
+        ])
     ])
 ])
 
 dnl Test whether the *printf family of functions supports large precisions.
 dnl On mingw, precisions larger than 512 are treated like 512, in integer,
-dnl floating-point or pointer output. On BeOS, precisions larger than 1044
-dnl crash the program.
+dnl floating-point or pointer output. On Solaris 10/x86, precisions larger
+dnl than 510 in floating-point output crash the program. On Solaris 10/SPARC,
+dnl precisions larger than 510 in floating-point output yield wrong results.
+dnl On AIX 7.1, precisions larger than 998 in floating-point output yield
+dnl wrong results. On BeOS, precisions larger than 1044 crash the program.
 dnl Result is gl_cv_func_printf_precision.
 
 AC_DEFUN([gl_PRINTF_PRECISION],
@@ -868,30 +923,43 @@ AC_DEFUN([gl_PRINTF_PRECISION],
   AC_CACHE_CHECK([whether printf supports large precisions],
     [gl_cv_func_printf_precision],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <string.h>
 static char buf[5000];
 int main ()
 {
+  int result = 0;
 #ifdef __BEOS__
   /* On BeOS, this would crash and show a dialog box.  Avoid the crash.  */
   return 1;
 #endif
   if (sprintf (buf, "%.4000d %d", 1, 33, 44) < 4000 + 3)
-    return 1;
-  return 0;
-}], [gl_cv_func_printf_precision=yes], [gl_cv_func_printf_precision=no],
-      [
+    result |= 1;
+  if (sprintf (buf, "%.4000f %d", 1.0, 33, 44) < 4000 + 5)
+    result |= 2;
+  if (sprintf (buf, "%.511f %d", 1.0, 33, 44) < 511 + 5
+      || buf[0] != '1')
+    result |= 4;
+  if (sprintf (buf, "%.999f %d", 1.0, 33, 44) < 999 + 5
+      || buf[0] != '1')
+    result |= 4;
+  return result;
+}]])],
+        [gl_cv_func_printf_precision=yes],
+        [gl_cv_func_printf_precision=no],
+        [
 changequote(,)dnl
-       case "$host_os" in
-         # Guess no only on native Win32 and BeOS systems.
-         mingw* | pw*) gl_cv_func_printf_precision="guessing no" ;;
-         beos*)        gl_cv_func_printf_precision="guessing no" ;;
-         *)            gl_cv_func_printf_precision="guessing yes" ;;
-       esac
+         case "$host_os" in
+           # Guess no only on Solaris, native Windows, and BeOS systems.
+           solaris*)     gl_cv_func_printf_precision="guessing no" ;;
+           mingw* | pw*) gl_cv_func_printf_precision="guessing no" ;;
+           beos*)        gl_cv_func_printf_precision="guessing no" ;;
+           *)            gl_cv_func_printf_precision="guessing yes" ;;
+         esac
 changequote([,])dnl
-      ])
+        ])
     ])
 ])
 
@@ -960,8 +1028,9 @@ int main()
 changequote([,])dnl
           ])])
           if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
-            (./conftest
+            (./conftest 2>&AS_MESSAGE_LOG_FD
              result=$?
+             _AS_ECHO_LOG([\$? = $result])
              if test $result != 0 && test $result != 77; then result=1; fi
              exit $result
             ) >/dev/null 2>/dev/null
@@ -975,7 +1044,7 @@ changequote([,])dnl
           fi
           rm -fr conftest*
         else
-          dnl A universal build on Apple MacOS X platforms.
+          dnl A universal build on Apple Mac OS X platforms.
           dnl The result would be 'no' in 32-bit mode and 'yes' in 64-bit mode.
           dnl But we need a configuration result that is valid in both modes.
           gl_cv_func_printf_enomem="guessing no"
@@ -1028,61 +1097,80 @@ AC_DEFUN([gl_SNPRINTF_TRUNCATION_C99],
 [
   AC_REQUIRE([AC_PROG_CC])
   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+  AC_REQUIRE([gl_SNPRINTF_PRESENCE])
   AC_CACHE_CHECK([whether snprintf truncates the result as in C99],
     [gl_cv_func_snprintf_truncation_c99],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <string.h>
+#if HAVE_SNPRINTF
+# define my_snprintf snprintf
+#else
+# include <stdarg.h>
+static int my_snprintf (char *buf, int size, const char *format, ...)
+{
+  va_list args;
+  int ret;
+  va_start (args, format);
+  ret = vsnprintf (buf, size, format, args);
+  va_end (args);
+  return ret;
+}
+#endif
 static char buf[100];
 int main ()
 {
   strcpy (buf, "ABCDEF");
-  snprintf (buf, 3, "%d %d", 4567, 89);
+  my_snprintf (buf, 3, "%d %d", 4567, 89);
   if (memcmp (buf, "45\0DEF", 6) != 0)
     return 1;
   return 0;
-}], [gl_cv_func_snprintf_truncation_c99=yes], [gl_cv_func_snprintf_truncation_c99=no],
-      [
+}]])],
+        [gl_cv_func_snprintf_truncation_c99=yes],
+        [gl_cv_func_snprintf_truncation_c99=no],
+        [
 changequote(,)dnl
-       case "$host_os" in
-                               # Guess yes on glibc systems.
-         *-gnu*)               gl_cv_func_snprintf_truncation_c99="guessing yes";;
-                               # Guess yes on FreeBSD >= 5.
-         freebsd[1-4]*)        gl_cv_func_snprintf_truncation_c99="guessing no";;
-         freebsd* | kfreebsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
-                               # Guess yes on MacOS X >= 10.3.
-         darwin[1-6].*)        gl_cv_func_snprintf_truncation_c99="guessing no";;
-         darwin*)              gl_cv_func_snprintf_truncation_c99="guessing yes";;
-                               # Guess yes on OpenBSD >= 3.9.
-         openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
-                               gl_cv_func_snprintf_truncation_c99="guessing no";;
-         openbsd*)             gl_cv_func_snprintf_truncation_c99="guessing yes";;
-                               # Guess yes on Solaris >= 2.6.
-         solaris2.[0-5]*)      gl_cv_func_snprintf_truncation_c99="guessing no";;
-         solaris*)             gl_cv_func_snprintf_truncation_c99="guessing yes";;
-                               # Guess yes on AIX >= 4.
-         aix[1-3]*)            gl_cv_func_snprintf_truncation_c99="guessing no";;
-         aix*)                 gl_cv_func_snprintf_truncation_c99="guessing yes";;
-                               # Guess yes on HP-UX >= 11.
-         hpux[7-9]* | hpux10*) gl_cv_func_snprintf_truncation_c99="guessing no";;
-         hpux*)                gl_cv_func_snprintf_truncation_c99="guessing yes";;
-                               # Guess yes on IRIX >= 6.5.
-         irix6.5)              gl_cv_func_snprintf_truncation_c99="guessing yes";;
-                               # Guess yes on OSF/1 >= 5.
-         osf[3-4]*)            gl_cv_func_snprintf_truncation_c99="guessing no";;
-         osf*)                 gl_cv_func_snprintf_truncation_c99="guessing yes";;
-                               # Guess yes on NetBSD >= 3.
-         netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
-                               gl_cv_func_snprintf_truncation_c99="guessing no";;
-         netbsd*)              gl_cv_func_snprintf_truncation_c99="guessing yes";;
-                               # Guess yes on BeOS.
-         beos*)                gl_cv_func_snprintf_truncation_c99="guessing yes";;
-                               # If we don't know, assume the worst.
-         *)                    gl_cv_func_snprintf_truncation_c99="guessing no";;
-       esac
+         case "$host_os" in
+                                 # Guess yes on glibc systems.
+           *-gnu*)               gl_cv_func_snprintf_truncation_c99="guessing yes";;
+                                 # Guess yes on FreeBSD >= 5.
+           freebsd[1-4]*)        gl_cv_func_snprintf_truncation_c99="guessing no";;
+           freebsd* | kfreebsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
+                                 # Guess yes on Mac OS X >= 10.3.
+           darwin[1-6].*)        gl_cv_func_snprintf_truncation_c99="guessing no";;
+           darwin*)              gl_cv_func_snprintf_truncation_c99="guessing yes";;
+                                 # Guess yes on OpenBSD >= 3.9.
+           openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
+                                 gl_cv_func_snprintf_truncation_c99="guessing no";;
+           openbsd*)             gl_cv_func_snprintf_truncation_c99="guessing yes";;
+                                 # Guess yes on Solaris >= 2.6.
+           solaris2.[0-5] | solaris2.[0-5].*)
+                                 gl_cv_func_snprintf_truncation_c99="guessing no";;
+           solaris*)             gl_cv_func_snprintf_truncation_c99="guessing yes";;
+                                 # Guess yes on AIX >= 4.
+           aix[1-3]*)            gl_cv_func_snprintf_truncation_c99="guessing no";;
+           aix*)                 gl_cv_func_snprintf_truncation_c99="guessing yes";;
+                                 # Guess yes on HP-UX >= 11.
+           hpux[7-9]* | hpux10*) gl_cv_func_snprintf_truncation_c99="guessing no";;
+           hpux*)                gl_cv_func_snprintf_truncation_c99="guessing yes";;
+                                 # Guess yes on IRIX >= 6.5.
+           irix6.5)              gl_cv_func_snprintf_truncation_c99="guessing yes";;
+                                 # Guess yes on OSF/1 >= 5.
+           osf[3-4]*)            gl_cv_func_snprintf_truncation_c99="guessing no";;
+           osf*)                 gl_cv_func_snprintf_truncation_c99="guessing yes";;
+                                 # Guess yes on NetBSD >= 3.
+           netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
+                                 gl_cv_func_snprintf_truncation_c99="guessing no";;
+           netbsd*)              gl_cv_func_snprintf_truncation_c99="guessing yes";;
+                                 # Guess yes on BeOS.
+           beos*)                gl_cv_func_snprintf_truncation_c99="guessing yes";;
+                                 # If we don't know, assume the worst.
+           *)                    gl_cv_func_snprintf_truncation_c99="guessing no";;
+         esac
 changequote([,])dnl
-      ])
+        ])
     ])
 ])
 
@@ -1105,52 +1193,74 @@ AC_DEFUN_ONCE([gl_SNPRINTF_RETVAL_C99],
 [
   AC_REQUIRE([AC_PROG_CC])
   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+  AC_REQUIRE([gl_SNPRINTF_PRESENCE])
   AC_CACHE_CHECK([whether snprintf returns a byte count as in C99],
     [gl_cv_func_snprintf_retval_c99],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <string.h>
+#if HAVE_SNPRINTF
+# define my_snprintf snprintf
+#else
+# include <stdarg.h>
+static int my_snprintf (char *buf, int size, const char *format, ...)
+{
+  va_list args;
+  int ret;
+  va_start (args, format);
+  ret = vsnprintf (buf, size, format, args);
+  va_end (args);
+  return ret;
+}
+#endif
 static char buf[100];
 int main ()
 {
   strcpy (buf, "ABCDEF");
-  if (snprintf (buf, 3, "%d %d", 4567, 89) != 7)
+  if (my_snprintf (buf, 3, "%d %d", 4567, 89) != 7)
     return 1;
+  if (my_snprintf (buf, 0, "%d %d", 4567, 89) != 7)
+    return 2;
+  if (my_snprintf (NULL, 0, "%d %d", 4567, 89) != 7)
+    return 3;
   return 0;
-}], [gl_cv_func_snprintf_retval_c99=yes], [gl_cv_func_snprintf_retval_c99=no],
-      [
+}]])],
+        [gl_cv_func_snprintf_retval_c99=yes],
+        [gl_cv_func_snprintf_retval_c99=no],
+        [
 changequote(,)dnl
-       case "$host_os" in
-                               # Guess yes on glibc systems.
-         *-gnu*)               gl_cv_func_snprintf_retval_c99="guessing yes";;
-                               # Guess yes on FreeBSD >= 5.
-         freebsd[1-4]*)        gl_cv_func_snprintf_retval_c99="guessing no";;
-         freebsd* | kfreebsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
-                               # Guess yes on MacOS X >= 10.3.
-         darwin[1-6].*)        gl_cv_func_snprintf_retval_c99="guessing no";;
-         darwin*)              gl_cv_func_snprintf_retval_c99="guessing yes";;
-                               # Guess yes on OpenBSD >= 3.9.
-         openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
-                               gl_cv_func_snprintf_retval_c99="guessing no";;
-         openbsd*)             gl_cv_func_snprintf_retval_c99="guessing yes";;
-                               # Guess yes on Solaris >= 2.6.
-         solaris2.[0-5]*)      gl_cv_func_snprintf_retval_c99="guessing no";;
-         solaris*)             gl_cv_func_snprintf_retval_c99="guessing yes";;
-                               # Guess yes on AIX >= 4.
-         aix[1-3]*)            gl_cv_func_snprintf_retval_c99="guessing no";;
-         aix*)                 gl_cv_func_snprintf_retval_c99="guessing yes";;
-                               # Guess yes on NetBSD >= 3.
-         netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
-                               gl_cv_func_snprintf_retval_c99="guessing no";;
-         netbsd*)              gl_cv_func_snprintf_retval_c99="guessing yes";;
-                               # Guess yes on BeOS.
-         beos*)                gl_cv_func_snprintf_retval_c99="guessing yes";;
-                               # If we don't know, assume the worst.
-         *)                    gl_cv_func_snprintf_retval_c99="guessing no";;
-       esac
+         case "$host_os" in
+                                 # Guess yes on glibc systems.
+           *-gnu*)               gl_cv_func_snprintf_retval_c99="guessing yes";;
+                                 # Guess yes on FreeBSD >= 5.
+           freebsd[1-4]*)        gl_cv_func_snprintf_retval_c99="guessing no";;
+           freebsd* | kfreebsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
+                                 # Guess yes on Mac OS X >= 10.3.
+           darwin[1-6].*)        gl_cv_func_snprintf_retval_c99="guessing no";;
+           darwin*)              gl_cv_func_snprintf_retval_c99="guessing yes";;
+                                 # Guess yes on OpenBSD >= 3.9.
+           openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
+                                 gl_cv_func_snprintf_retval_c99="guessing no";;
+           openbsd*)             gl_cv_func_snprintf_retval_c99="guessing yes";;
+                                 # Guess yes on Solaris >= 2.10.
+           solaris2.[1-9][0-9]*) gl_cv_func_printf_sizes_c99="guessing yes";;
+           solaris*)             gl_cv_func_printf_sizes_c99="guessing no";;
+                                 # Guess yes on AIX >= 4.
+           aix[1-3]*)            gl_cv_func_snprintf_retval_c99="guessing no";;
+           aix*)                 gl_cv_func_snprintf_retval_c99="guessing yes";;
+                                 # Guess yes on NetBSD >= 3.
+           netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
+                                 gl_cv_func_snprintf_retval_c99="guessing no";;
+           netbsd*)              gl_cv_func_snprintf_retval_c99="guessing yes";;
+                                 # Guess yes on BeOS.
+           beos*)                gl_cv_func_snprintf_retval_c99="guessing yes";;
+                                 # If we don't know, assume the worst.
+           *)                    gl_cv_func_snprintf_retval_c99="guessing no";;
+         esac
 changequote([,])dnl
-      ])
+        ])
     ])
 ])
 
@@ -1162,12 +1272,28 @@ AC_DEFUN([gl_SNPRINTF_DIRECTIVE_N],
 [
   AC_REQUIRE([AC_PROG_CC])
   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+  AC_REQUIRE([gl_SNPRINTF_PRESENCE])
   AC_CACHE_CHECK([whether snprintf fully supports the 'n' directive],
     [gl_cv_func_snprintf_directive_n],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <string.h>
+#if HAVE_SNPRINTF
+# define my_snprintf snprintf
+#else
+# include <stdarg.h>
+static int my_snprintf (char *buf, int size, const char *format, ...)
+{
+  va_list args;
+  int ret;
+  va_start (args, format);
+  ret = vsnprintf (buf, size, format, args);
+  va_end (args);
+  return ret;
+}
+#endif
 static char fmtstring[10];
 static char buf[100];
 int main ()
@@ -1177,44 +1303,47 @@ int main ()
      support %n in format strings in read-only memory but not in writable
      memory.  */
   strcpy (fmtstring, "%d %n");
-  snprintf (buf, 4, fmtstring, 12345, &count, 33, 44, 55);
+  my_snprintf (buf, 4, fmtstring, 12345, &count, 33, 44, 55);
   if (count != 6)
     return 1;
   return 0;
-}], [gl_cv_func_snprintf_directive_n=yes], [gl_cv_func_snprintf_directive_n=no],
-      [
+}]])],
+        [gl_cv_func_snprintf_directive_n=yes],
+        [gl_cv_func_snprintf_directive_n=no],
+        [
 changequote(,)dnl
-       case "$host_os" in
-                               # Guess yes on glibc systems.
-         *-gnu*)               gl_cv_func_snprintf_directive_n="guessing yes";;
-                               # Guess yes on FreeBSD >= 5.
-         freebsd[1-4]*)        gl_cv_func_snprintf_directive_n="guessing no";;
-         freebsd* | kfreebsd*) gl_cv_func_snprintf_directive_n="guessing yes";;
-                               # Guess yes on MacOS X >= 10.3.
-         darwin[1-6].*)        gl_cv_func_snprintf_directive_n="guessing no";;
-         darwin*)              gl_cv_func_snprintf_directive_n="guessing yes";;
-                               # Guess yes on Solaris >= 2.6.
-         solaris2.[0-5]*)      gl_cv_func_snprintf_directive_n="guessing no";;
-         solaris*)             gl_cv_func_snprintf_directive_n="guessing yes";;
-                               # Guess yes on AIX >= 4.
-         aix[1-3]*)            gl_cv_func_snprintf_directive_n="guessing no";;
-         aix*)                 gl_cv_func_snprintf_directive_n="guessing yes";;
-                               # Guess yes on IRIX >= 6.5.
-         irix6.5)              gl_cv_func_snprintf_directive_n="guessing yes";;
-                               # Guess yes on OSF/1 >= 5.
-         osf[3-4]*)            gl_cv_func_snprintf_directive_n="guessing no";;
-         osf*)                 gl_cv_func_snprintf_directive_n="guessing yes";;
-                               # Guess yes on NetBSD >= 3.
-         netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
-                               gl_cv_func_snprintf_directive_n="guessing no";;
-         netbsd*)              gl_cv_func_snprintf_directive_n="guessing yes";;
-                               # Guess yes on BeOS.
-         beos*)                gl_cv_func_snprintf_directive_n="guessing yes";;
-                               # If we don't know, assume the worst.
-         *)                    gl_cv_func_snprintf_directive_n="guessing no";;
-       esac
+         case "$host_os" in
+                                 # Guess yes on glibc systems.
+           *-gnu*)               gl_cv_func_snprintf_directive_n="guessing yes";;
+                                 # Guess yes on FreeBSD >= 5.
+           freebsd[1-4]*)        gl_cv_func_snprintf_directive_n="guessing no";;
+           freebsd* | kfreebsd*) gl_cv_func_snprintf_directive_n="guessing yes";;
+                                 # Guess yes on Mac OS X >= 10.3.
+           darwin[1-6].*)        gl_cv_func_snprintf_directive_n="guessing no";;
+           darwin*)              gl_cv_func_snprintf_directive_n="guessing yes";;
+                                 # Guess yes on Solaris >= 2.6.
+           solaris2.[0-5] | solaris2.[0-5].*)
+                                 gl_cv_func_snprintf_directive_n="guessing no";;
+           solaris*)             gl_cv_func_snprintf_directive_n="guessing yes";;
+                                 # Guess yes on AIX >= 4.
+           aix[1-3]*)            gl_cv_func_snprintf_directive_n="guessing no";;
+           aix*)                 gl_cv_func_snprintf_directive_n="guessing yes";;
+                                 # Guess yes on IRIX >= 6.5.
+           irix6.5)              gl_cv_func_snprintf_directive_n="guessing yes";;
+                                 # Guess yes on OSF/1 >= 5.
+           osf[3-4]*)            gl_cv_func_snprintf_directive_n="guessing no";;
+           osf*)                 gl_cv_func_snprintf_directive_n="guessing yes";;
+                                 # Guess yes on NetBSD >= 3.
+           netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
+                                 gl_cv_func_snprintf_directive_n="guessing no";;
+           netbsd*)              gl_cv_func_snprintf_directive_n="guessing yes";;
+                                 # Guess yes on BeOS.
+           beos*)                gl_cv_func_snprintf_directive_n="guessing yes";;
+                                 # If we don't know, assume the worst.
+           *)                    gl_cv_func_snprintf_directive_n="guessing no";;
+         esac
 changequote([,])dnl
-      ])
+        ])
     ])
 ])
 
@@ -1226,20 +1355,36 @@ dnl Result is gl_cv_func_snprintf_size1.
 AC_DEFUN([gl_SNPRINTF_SIZE1],
 [
   AC_REQUIRE([AC_PROG_CC])
+  AC_REQUIRE([gl_SNPRINTF_PRESENCE])
   AC_CACHE_CHECK([whether snprintf respects a size of 1],
     [gl_cv_func_snprintf_size1],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stdio.h>
+#if HAVE_SNPRINTF
+# define my_snprintf snprintf
+#else
+# include <stdarg.h>
+static int my_snprintf (char *buf, int size, const char *format, ...)
+{
+  va_list args;
+  int ret;
+  va_start (args, format);
+  ret = vsnprintf (buf, size, format, args);
+  va_end (args);
+  return ret;
+}
+#endif
 int main()
 {
   static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' };
-  snprintf (buf, 1, "%d", 12345);
+  my_snprintf (buf, 1, "%d", 12345);
   return buf[1] != 'E';
-}],
-      [gl_cv_func_snprintf_size1=yes],
-      [gl_cv_func_snprintf_size1=no],
-      [gl_cv_func_snprintf_size1="guessing yes"])
+}]])],
+        [gl_cv_func_snprintf_size1=yes],
+        [gl_cv_func_snprintf_size1=no],
+        [gl_cv_func_snprintf_size1="guessing yes"])
     ])
 ])
 
@@ -1286,7 +1431,8 @@ AC_DEFUN([gl_VSNPRINTF_ZEROSIZE_C99],
   AC_CACHE_CHECK([whether vsnprintf respects a zero size as in C99],
     [gl_cv_func_vsnprintf_zerosize_c99],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stdarg.h>
 #include <stdio.h>
 static int my_snprintf (char *buf, int size, const char *format, ...)
@@ -1303,43 +1449,44 @@ int main()
   static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' };
   my_snprintf (buf, 0, "%d", 12345);
   return buf[0] != 'D';
-}],
-      [gl_cv_func_vsnprintf_zerosize_c99=yes],
-      [gl_cv_func_vsnprintf_zerosize_c99=no],
-      [
+}]])],
+        [gl_cv_func_vsnprintf_zerosize_c99=yes],
+        [gl_cv_func_vsnprintf_zerosize_c99=no],
+        [
 changequote(,)dnl
-       case "$host_os" in
-                               # Guess yes on glibc systems.
-         *-gnu*)               gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
-                               # Guess yes on FreeBSD >= 5.
-         freebsd[1-4]*)        gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
-         freebsd* | kfreebsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
-                               # Guess yes on MacOS X >= 10.3.
-         darwin[1-6].*)        gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
-         darwin*)              gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
-                               # Guess yes on Cygwin.
-         cygwin*)              gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
-                               # Guess yes on Solaris >= 2.6.
-         solaris2.[0-5]*)      gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
-         solaris*)             gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
-                               # Guess yes on AIX >= 4.
-         aix[1-3]*)            gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
-         aix*)                 gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
-                               # Guess yes on IRIX >= 6.5.
-         irix6.5)              gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
-                               # Guess yes on NetBSD >= 3.
-         netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
-                               gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
-         netbsd*)              gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
-                               # Guess yes on BeOS.
-         beos*)                gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
-                               # Guess yes on mingw.
-         mingw* | pw*)         gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
-                               # If we don't know, assume the worst.
-         *)                    gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
-       esac
+         case "$host_os" in
+                                 # Guess yes on glibc systems.
+           *-gnu*)               gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
+                                 # Guess yes on FreeBSD >= 5.
+           freebsd[1-4]*)        gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
+           freebsd* | kfreebsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
+                                 # Guess yes on Mac OS X >= 10.3.
+           darwin[1-6].*)        gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
+           darwin*)              gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
+                                 # Guess yes on Cygwin.
+           cygwin*)              gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
+                                 # Guess yes on Solaris >= 2.6.
+           solaris2.[0-5] | solaris2.[0-5].*)
+                                 gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
+           solaris*)             gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
+                                 # Guess yes on AIX >= 4.
+           aix[1-3]*)            gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
+           aix*)                 gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
+                                 # Guess yes on IRIX >= 6.5.
+           irix6.5)              gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
+                                 # Guess yes on NetBSD >= 3.
+           netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
+                                 gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
+           netbsd*)              gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
+                                 # Guess yes on BeOS.
+           beos*)                gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
+                                 # Guess yes on mingw.
+           mingw* | pw*)         gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
+                                 # If we don't know, assume the worst.
+           *)                    gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
+         esac
 changequote([,])dnl
-      ])
+        ])
     ])
 ])
 
@@ -1393,24 +1540,31 @@ dnl                                  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
 dnl   glibc 2.5                      .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .
 dnl   glibc 2.3.6                    .  .  .  .  #  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .
 dnl   FreeBSD 5.4, 6.1               .  .  .  .  #  .  .  .  .  .  .  #  .  #  .  .  .  .  .  .
-dnl   MacOS X 10.3.9                 .  .  .  .  #  .  .  .  .  .  .  #  .  #  .  .  .  .  .  .
+dnl   Mac OS X 10.5.8                .  .  .  #  #  .  .  .  .  .  .  #  .  .  .  .  .  .  .  .
+dnl   Mac OS X 10.3.9                .  .  .  .  #  .  .  .  .  .  .  #  .  #  .  .  .  .  .  .
 dnl   OpenBSD 3.9, 4.0               .  .  #  #  #  #  .  #  .  #  .  #  .  #  .  .  .  .  .  .
 dnl   Cygwin 1.7.0 (2009)            .  .  .  #  .  .  .  ?  .  .  .  .  .  ?  .  .  .  .  .  .
 dnl   Cygwin 1.5.25 (2008)           .  .  .  #  #  .  .  #  .  .  .  .  .  #  .  .  .  .  .  .
 dnl   Cygwin 1.5.19 (2006)           #  .  .  #  #  #  .  #  .  #  .  #  #  #  .  .  .  .  .  .
-dnl   Solaris 10                     .  .  #  #  #  .  .  #  .  .  .  #  .  .  .  .  .  .  .  .
-dnl   Solaris 2.6 ... 9              #  .  #  #  #  #  .  #  .  .  .  #  .  .  .  .  .  .  .  .
+dnl   Solaris 11 2011-11             .  .  #  #  #  .  .  #  .  .  .  #  .  .  .  .  .  .  .  .
+dnl   Solaris 10                     .  .  #  #  #  .  .  #  .  .  .  #  #  .  .  .  .  .  .  .
+dnl   Solaris 2.6 ... 9              #  .  #  #  #  #  .  #  .  .  .  #  #  .  .  .  #  .  .  .
 dnl   Solaris 2.5.1                  #  .  #  #  #  #  .  #  .  .  .  #  .  .  #  #  #  #  #  #
+dnl   AIX 7.1                        .  .  #  #  #  .  .  .  .  .  .  #  #  .  .  .  .  .  .  .
 dnl   AIX 5.2                        .  .  #  #  #  .  .  .  .  .  .  #  .  .  .  .  .  .  .  .
-dnl   AIX 4.3.2, 5.1                 #  .  #  #  #  #  .  .  .  .  .  #  .  .  .  .  .  .  .  .
+dnl   AIX 4.3.2, 5.1                 #  .  #  #  #  #  .  .  .  .  .  #  .  .  .  .  #  .  .  .
 dnl   HP-UX 11.31                    .  .  .  .  #  .  .  .  .  .  .  #  .  .  .  .  #  #  .  .
 dnl   HP-UX 11.{00,11,23}            #  .  .  .  #  #  .  .  .  .  .  #  .  .  .  .  #  #  .  #
 dnl   HP-UX 10.20                    #  .  #  .  #  #  .  ?  .  .  #  #  .  .  .  .  #  #  ?  #
 dnl   IRIX 6.5                       #  .  #  #  #  #  .  #  .  .  .  #  .  .  .  .  #  .  .  .
 dnl   OSF/1 5.1                      #  .  #  #  #  #  .  .  .  .  .  #  .  .  .  .  #  .  .  #
 dnl   OSF/1 4.0d                     #  .  #  #  #  #  .  .  .  .  .  #  .  .  #  #  #  #  #  #
+dnl   NetBSD 5.0                     .  .  .  #  #  .  .  .  .  .  .  #  .  #  .  .  .  .  .  .
 dnl   NetBSD 4.0                     .  ?  ?  ?  ?  ?  .  ?  .  ?  ?  ?  ?  ?  .  .  .  ?  ?  ?
 dnl   NetBSD 3.0                     .  .  .  .  #  #  .  ?  #  #  ?  #  .  #  .  .  .  .  .  .
-dnl   Haiku                          .  .  .  #  #  #  .  #  .  .  .  .  .  ?  .  .  .  .  .  .
-dnl   BeOS                           #  #  .  #  #  #  .  ?  #  .  ?  .  #  ?  .  .  .  .  .  .
-dnl   mingw                          #  #  #  #  #  #  .  .  #  #  .  #  #  ?  .  #  #  #  .  .
+dnl   Haiku                          .  .  .  #  #  #  .  #  .  .  .  .  .  ?  .  .  ?  .  .  .
+dnl   BeOS                           #  #  .  #  #  #  .  ?  #  .  ?  .  #  ?  .  .  ?  .  .  .
+dnl   old mingw / msvcrt             #  #  #  #  #  #  .  .  #  #  .  #  #  ?  .  #  #  #  .  .
+dnl   MSVC 9                         #  #  #  #  #  #  #  .  #  #  .  #  #  ?  #  #  #  #  .  .
+dnl   mingw 2009-2011                .  #  .  #  .  .  .  .  #  #  .  .  .  ?  .  .  .  .  .  .
+dnl   mingw-w64 2011                 #  #  #  #  #  #  .  .  #  #  .  #  #  ?  .  #  #  #  .  .