Imported Upstream version 1.4.19

[platform/upstream/m4.git] / m4 / isnanf.m4

diff --git a/m4/isnanf.m4 b/m4/isnanf.m4
index f49d20c..d0f6a56 100644 (file)
--- a/m4/isnanf.m4
+++ b/m4/isnanf.m4
@@ -1,5 +1,5 @@
-# isnanf.m4 serial 14
-dnl Copyright (C) 2007-2016 Free Software Foundation, Inc.
+# isnanf.m4 serial 18
+dnl Copyright (C) 2007-2021 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.
@@ -74,9 +74,9 @@ AC_DEFUN([gl_HAVE_ISNANF_NO_LIBM],
       AC_LINK_IFELSE(
         [AC_LANG_PROGRAM(
            [[#include <math.h>
-             #if __GNUC__ >= 4
+             #if (__GNUC__ >= 4) || (__clang_major__ >= 4)
              # undef isnanf
-             # define isnanf(x) __builtin_isnanf ((float)(x))
+             # define isnanf(x) __builtin_isnan ((float)(x))
              #elif defined isnan
              # undef isnanf
              # define isnanf(x) isnan ((float)(x))
@@ -99,9 +99,9 @@ AC_DEFUN([gl_HAVE_ISNANF_IN_LIBM],
       AC_LINK_IFELSE(
         [AC_LANG_PROGRAM(
            [[#include <math.h>
-             #if __GNUC__ >= 4
+             #if (__GNUC__ >= 4) || (__clang_major__ >= 4)
              # undef isnanf
-             # define isnanf(x) __builtin_isnanf ((float)(x))
+             # define isnanf(x) __builtin_isnan ((float)(x))
              #elif defined isnan
              # undef isnanf
              # define isnanf(x) isnan ((float)(x))
@@ -127,9 +127,9 @@ AC_DEFUN([gl_ISNANF_WORKS],
       AC_RUN_IFELSE(
         [AC_LANG_SOURCE([[
 #include <math.h>
-#if __GNUC__ >= 4
+#if (__GNUC__ >= 4) || (__clang_major__ >= 4)
 # undef isnanf
-# define isnanf(x) __builtin_isnanf ((float)(x))
+# define isnanf(x) __builtin_isnan ((float)(x))
 #elif defined isnan
 # undef isnanf
 # define isnanf(x) isnan ((float)(x))
@@ -169,7 +169,7 @@ int main()
       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;
+      m.word[0] |= (1U << (FLT_EXPBIT0_BIT - 1)) - 1;
       if (!isnanf (m.value))
         result |= 4;
     }
@@ -180,8 +180,17 @@ int main()
         [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";;
+           irix* | solaris*) gl_cv_func_isnanf_works="guessing no" ;;
+           mingw*) # Guess yes on mingw, no on MSVC.
+             AC_EGREP_CPP([Known], [
+#ifdef __MINGW32__
+ Known
+#endif
+               ],
+               [gl_cv_func_isnanf_works="guessing yes"],
+               [gl_cv_func_isnanf_works="guessing no"])
+             ;;
+           *) gl_cv_func_isnanf_works="guessing yes" ;;
          esac
         ])
     ])