-# isnanf.m4 serial 11
-dnl Copyright (C) 2007-2010 Free Software Foundation, Inc.
+# isnanf.m4 serial 12
+dnl Copyright (C) 2007-2011 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_REQUIRE([gl_FLOAT_EXPONENT_LOCATION])
AC_CACHE_CHECK([whether isnan(float) works], [gl_cv_func_isnanf_works],
[
- AC_TRY_RUN([
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
#include <math.h>
#if __GNUC__ >= 4
# undef isnanf
typedef union { unsigned int word[NWORDS]; float value; } memory_float;
int main()
{
- memory_float m;
+ int result = 0;
if (isnanf (1.0f / 0.0f))
- return 1;
+ result |= 1;
if (!isnanf (NaN ()))
- return 1;
+ result |= 2;
#if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT
/* The isnanf function should be immune against changes in the sign bit and
a sign bit or a mantissa bit. */
if (FLT_EXPBIT0_WORD == 0 && FLT_EXPBIT0_BIT > 0)
{
+ memory_float m;
+
m.value = NaN ();
/* Set the bits below the exponent to 01111...111. */
m.word[0] &= -1U << FLT_EXPBIT0_BIT;
m.word[0] |= 1U << (FLT_EXPBIT0_BIT - 1) - 1;
if (!isnanf (m.value))
- return 1;
+ result |= 4;
}
#endif
- return 0;
-}], [gl_cv_func_isnanf_works=yes], [gl_cv_func_isnanf_works=no],
+ return result;
+}]])],
+ [gl_cv_func_isnanf_works=yes],
+ [gl_cv_func_isnanf_works=no],
[case "$host_os" in
irix* | solaris*) gl_cv_func_isnanf_works="guessing no";;
*) gl_cv_func_isnanf_works="guessing yes";;