X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fisnanf.m4;h=66ed954bed76a9a54e505e92578d718dfbd41424;hb=9723bfe9bb9af8309314ad6230f7661000ba03b1;hp=1509fb4432c78d8293e2b90e03fc539a95f809c3;hpb=b2e2010c7c902235b5efb5bd3c6529f61b093aa4;p=gnulib.git

diff --git a/m4/isnanf.m4 b/m4/isnanf.m4
index 1509fb443..66ed954be 100644
--- a/m4/isnanf.m4
+++ b/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) 2007-2011 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.
@@ -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";;