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Diffstat (limited to 'gnulib-m4/isnanf.m4')
-rw-r--r--gnulib-m4/isnanf.m477
1 files changed, 43 insertions, 34 deletions
diff --git a/gnulib-m4/isnanf.m4 b/gnulib-m4/isnanf.m4
index 1509fb44..09c3e5ed 100644
--- a/gnulib-m4/isnanf.m4
+++ b/gnulib-m4/isnanf.m4
@@ -1,5 +1,5 @@
-# isnanf.m4 serial 10
-dnl Copyright (C) 2007-2010 Free Software Foundation, Inc.
+# isnanf.m4 serial 14
+dnl Copyright (C) 2007-2015 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.
@@ -17,6 +17,7 @@ AC_DEFUN([gl_FUNC_ISNANF],
ISNANF_LIBM=-lm
fi
fi
+ dnl The variable gl_func_isnanf set here is used by isnan.m4.
if test $gl_cv_func_isnanf_no_libm = yes \
|| test $gl_cv_func_isnanf_in_libm = yes; then
save_LIBS="$LIBS"
@@ -32,7 +33,6 @@ AC_DEFUN([gl_FUNC_ISNANF],
fi
if test $gl_func_isnanf != yes; then
HAVE_ISNANF=0
- gl_BUILD_ISNANF
fi
AC_SUBST([ISNANF_LIBM])
])
@@ -51,17 +51,17 @@ AC_DEFUN([gl_FUNC_ISNANF_NO_LIBM],
*) false;;
esac
}; then
+ gl_func_isnanf_no_libm=yes
AC_DEFINE([HAVE_ISNANF_IN_LIBC], [1],
[Define if the isnan(float) function is available in libc.])
else
- gl_BUILD_ISNANF
+ gl_func_isnanf_no_libm=no
fi
])
-dnl Pull in replacement isnanf definition. It does not need -lm.
-AC_DEFUN([gl_BUILD_ISNANF],
+dnl Prerequisites of replacement isnanf definition. It does not need -lm.
+AC_DEFUN([gl_PREREQ_ISNANF],
[
- AC_LIBOBJ([isnanf])
gl_FLOAT_EXPONENT_LOCATION
])
@@ -71,16 +71,18 @@ AC_DEFUN([gl_HAVE_ISNANF_NO_LIBM],
AC_CACHE_CHECK([whether isnan(float) can be used without linking with libm],
[gl_cv_func_isnanf_no_libm],
[
- AC_TRY_LINK([#include <math.h>
- #if __GNUC__ >= 4
- # undef isnanf
- # define isnanf(x) __builtin_isnanf ((float)(x))
- #elif defined isnan
- # undef isnanf
- # define isnanf(x) isnan ((float)(x))
- #endif
- float x;],
- [return isnanf (x);],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <math.h>
+ #if __GNUC__ >= 4
+ # undef isnanf
+ # define isnanf(x) __builtin_isnanf ((float)(x))
+ #elif defined isnan
+ # undef isnanf
+ # define isnanf(x) isnan ((float)(x))
+ #endif
+ float x;]],
+ [[return isnanf (x);]])],
[gl_cv_func_isnanf_no_libm=yes],
[gl_cv_func_isnanf_no_libm=no])
])
@@ -94,16 +96,18 @@ AC_DEFUN([gl_HAVE_ISNANF_IN_LIBM],
[
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
- AC_TRY_LINK([#include <math.h>
- #if __GNUC__ >= 4
- # undef isnanf
- # define isnanf(x) __builtin_isnanf ((float)(x))
- #elif defined isnan
- # undef isnanf
- # define isnanf(x) isnan ((float)(x))
- #endif
- float x;],
- [return isnanf (x);],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <math.h>
+ #if __GNUC__ >= 4
+ # undef isnanf
+ # define isnanf(x) __builtin_isnanf ((float)(x))
+ #elif defined isnan
+ # undef isnanf
+ # define isnanf(x) isnan ((float)(x))
+ #endif
+ float x;]],
+ [[return isnanf (x);]])],
[gl_cv_func_isnanf_in_libm=yes],
[gl_cv_func_isnanf_in_libm=no])
LIBS="$save_LIBS"
@@ -120,7 +124,8 @@ AC_DEFUN([gl_ISNANF_WORKS],
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
@@ -145,13 +150,13 @@ NaN ()
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
@@ -159,17 +164,21 @@ int main()
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";;