diff options
Diffstat (limited to 'gl/m4/stdbool.m4')
| -rw-r--r-- | gl/m4/stdbool.m4 | 137 |
1 files changed, 61 insertions, 76 deletions
diff --git a/gl/m4/stdbool.m4 b/gl/m4/stdbool.m4 index 3d672d74..80d5559a 100644 --- a/gl/m4/stdbool.m4 +++ b/gl/m4/stdbool.m4 @@ -1,15 +1,17 @@ # Check for stdbool.h that conforms to C99. -dnl Copyright (C) 2002-2006, 2009-2010 Free Software Foundation, Inc. +dnl Copyright (C) 2002-2006, 2009-2013 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. +#serial 5 + # Prepare for substituting <stdbool.h> if it is not supported. AC_DEFUN([AM_STDBOOL_H], [ - AC_REQUIRE([AC_HEADER_STDBOOL]) + AC_REQUIRE([AC_CHECK_HEADER_STDBOOL]) # Define two additional variables used in the Makefile substitution. @@ -19,6 +21,7 @@ AC_DEFUN([AM_STDBOOL_H], STDBOOL_H='stdbool.h' fi AC_SUBST([STDBOOL_H]) + AM_CONDITIONAL([GL_GENERATE_STDBOOL_H], [test -n "$STDBOOL_H"]) if test "$ac_cv_type__Bool" = yes; then HAVE__BOOL=1 @@ -31,85 +34,67 @@ AC_DEFUN([AM_STDBOOL_H], # AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future. AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H]) -# This macro is only needed in autoconf <= 2.59. Newer versions of autoconf -# have this macro built-in. +# This version of the macro is needed in autoconf <= 2.68. -AC_DEFUN([AC_HEADER_STDBOOL], +AC_DEFUN([AC_CHECK_HEADER_STDBOOL], [AC_CACHE_CHECK([for stdbool.h that conforms to C99], [ac_cv_header_stdbool_h], - [AC_TRY_COMPILE( - [ - #include <stdbool.h> - #ifndef bool - "error: bool is not defined" - #endif - #ifndef false - "error: false is not defined" - #endif - #if false - "error: false is not 0" - #endif - #ifndef true - "error: true is not defined" - #endif - #if true != 1 - "error: true is not 1" - #endif - #ifndef __bool_true_false_are_defined - "error: __bool_true_false_are_defined is not defined" - #endif + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[ + #include <stdbool.h> + #ifndef bool + "error: bool is not defined" + #endif + #ifndef false + "error: false is not defined" + #endif + #if false + "error: false is not 0" + #endif + #ifndef true + "error: true is not defined" + #endif + #if true != 1 + "error: true is not 1" + #endif + #ifndef __bool_true_false_are_defined + "error: __bool_true_false_are_defined is not defined" + #endif - struct s { _Bool s: 1; _Bool t; } s; + struct s { _Bool s: 1; _Bool t; } s; - char a[true == 1 ? 1 : -1]; - char b[false == 0 ? 1 : -1]; - char c[__bool_true_false_are_defined == 1 ? 1 : -1]; - char d[(bool) 0.5 == true ? 1 : -1]; - bool e = &s; - char f[(_Bool) 0.0 == false ? 1 : -1]; - char g[true]; - char h[sizeof (_Bool)]; - char i[sizeof s.t]; - enum { j = false, k = true, l = false * true, m = true * 256 }; - _Bool n[m]; - char o[sizeof n == m * sizeof n[0] ? 1 : -1]; - char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1]; - #if defined __xlc__ || defined __GNUC__ - /* Catch a bug in IBM AIX xlc compiler version 6.0.0.0 - reported by James Lemley on 2005-10-05; see - http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00086.html - This test is not quite right, since xlc is allowed to - reject this program, as the initializer for xlcbug is - not one of the forms that C requires support for. - However, doing the test right would require a run-time - test, and that would make cross-compilation harder. - Let us hope that IBM fixes the xlc bug, and also adds - support for this kind of constant expression. In the - meantime, this test will reject xlc, which is OK, since - our stdbool.h substitute should suffice. We also test - this with GCC, where it should work, to detect more - quickly whether someone messes up the test in the - future. */ - char digs[] = "0123456789"; - int xlcbug = 1 / (&(digs + 5)[-2 + (bool) 1] == &digs[4] ? 1 : -1); - #endif - /* Catch a bug in an HP-UX C compiler. See - http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html - http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html - */ - _Bool q = true; - _Bool *pq = &q; - ], - [ - *pq |= q; - *pq |= ! q; - /* Refer to every declared value, to avoid compiler optimizations. */ - return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l - + !m + !n + !o + !p + !q + !pq); - ], + char a[true == 1 ? 1 : -1]; + char b[false == 0 ? 1 : -1]; + char c[__bool_true_false_are_defined == 1 ? 1 : -1]; + char d[(bool) 0.5 == true ? 1 : -1]; + /* See body of main program for 'e'. */ + char f[(_Bool) 0.0 == false ? 1 : -1]; + char g[true]; + char h[sizeof (_Bool)]; + char i[sizeof s.t]; + enum { j = false, k = true, l = false * true, m = true * 256 }; + /* The following fails for + HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */ + _Bool n[m]; + char o[sizeof n == m * sizeof n[0] ? 1 : -1]; + char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1]; + /* Catch a bug in an HP-UX C compiler. See + http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html + http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html + */ + _Bool q = true; + _Bool *pq = &q; + ]], + [[ + bool e = &s; + *pq |= q; + *pq |= ! q; + /* Refer to every declared value, to avoid compiler optimizations. */ + return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l + + !m + !n + !o + !p + !q + !pq); + ]])], [ac_cv_header_stdbool_h=yes], [ac_cv_header_stdbool_h=no])]) AC_CHECK_TYPES([_Bool]) - if test $ac_cv_header_stdbool_h = yes; then - AC_DEFINE([HAVE_STDBOOL_H], [1], [Define to 1 if stdbool.h conforms to C99.]) - fi]) +]) |