1 files changed, 62 insertions, 0 deletions
diff --git a/gl/m4/floorf.m4 b/gl/m4/floorf.m4
new file mode 100644
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+++ b/gl/m4/floorf.m4
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+# floorf.m4 serial 3
+dnl Copyright (C) 2007 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.
+
+AC_DEFUN([gl_FUNC_FLOORF],
+[
+  AC_REQUIRE([gl_MATH_H_DEFAULTS])
+  dnl Persuade glibc <math.h> to declare floorf().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+  dnl Test whether floorf() is declared.
+  AC_CHECK_DECLS([floorf], , , [#include <math.h>])
+  if test "$ac_cv_have_decl_floorf" = yes; then
+    dnl Test whether floorf() can be used without libm.
+    gl_FUNC_FLOORF_LIBS
+    if test "$FLOORF_LIBM" = "?"; then
+      dnl Sun C 5.0 on Solaris declares floorf() and has it in the system-wide
+      dnl libm.so, but not in the libm.so that the compiler uses.
+      REPLACE_FLOORF=1
+    fi
+  else
+    REPLACE_FLOORF=1
+  fi
+  if test $REPLACE_FLOORF = 1; then
+    AC_LIBOBJ([floorf])
+    FLOORF_LIBM=
+  fi
+  AC_SUBST([REPLACE_FLOORF])
+  AC_SUBST([FLOORF_LIBM])
+])
+
+# Determines the libraries needed to get the floorf() function.
+# Sets FLOORF_LIBM.
+AC_DEFUN([gl_FUNC_FLOORF_LIBS],
+[
+  AC_CACHE_VAL([gl_cv_func_floorf_libm], [
+    gl_cv_func_floorf_libm=?
+    AC_TRY_LINK([
+       #ifndef __NO_MATH_INLINES
+       # define __NO_MATH_INLINES 1 /* for glibc */
+       #endif
+       #include <math.h>
+       float x;],
+      [x = floorf(x);],
+      [gl_cv_func_floorf_libm=])
+    if test "$gl_cv_func_floorf_libm" = "?"; then
+      save_LIBS="$LIBS"
+      LIBS="$LIBS -lm"
+      AC_TRY_LINK([
+         #ifndef __NO_MATH_INLINES
+         # define __NO_MATH_INLINES 1 /* for glibc */
+         #endif
+         #include <math.h>
+         float x;],
+        [x = floorf(x);],
+        [gl_cv_func_floorf_libm="-lm"])
+      LIBS="$save_LIBS"
+    fi
+  ])
+  FLOORF_LIBM="$gl_cv_func_floorf_libm"
+])