X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fldexpl.m4;h=bcc76b21bf6d6eda2c68e4600522ccbb1f0b7e62;hb=c5d62fdfd433cd8314d01e426380e5b1967c8374;hp=b7ef5807c064601bc37a091fc3ba3cfb8e763fa3;hpb=d6687687c7f3b86ba712ab98533a8094e9de58f5;p=gnulib.git

diff --git a/m4/ldexpl.m4 b/m4/ldexpl.m4
index b7ef5807c..bcc76b21b 100644
--- a/m4/ldexpl.m4
+++ b/m4/ldexpl.m4
@@ -1,5 +1,5 @@
-# ldexpl.m4 serial 2
-dnl Copyright (C) 2007 Free Software Foundation, Inc.
+# ldexpl.m4 serial 4
+dnl Copyright (C) 2007-2010 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.
@@ -48,17 +48,20 @@ AC_DEFUN([gl_FUNC_LDEXPL],
     gl_func_ldexpl=no
   fi
   if test $gl_func_ldexpl = yes; then
-    AC_DEFINE([HAVE_LDEXPL], 1,
+    AC_DEFINE([HAVE_LDEXPL], [1],
       [Define if the ldexpl() function is available.])
     dnl Also check whether it's declared.
     dnl MacOS X 10.3 has ldexpl() in libc but doesn't declare it in <math.h>.
     AC_CHECK_DECL([ldexpl], , [HAVE_DECL_LDEXPL=0], [#include <math.h>])
   else
+    HAVE_DECL_LDEXPL=0
     AC_LIBOBJ([ldexpl])
   fi
+  AC_SUBST([LDEXPL_LIBM])
 ])
 
-dnl Test whether ldexpl() works on finite numbers (this fails on AIX 5.1).
+dnl Test whether ldexpl() works on finite numbers (this fails on AIX 5.1
+dnl and MacOS X 10.4/PowerPC).
 AC_DEFUN([gl_FUNC_LDEXPL_WORKS],
 [
   AC_REQUIRE([AC_PROG_CC])
@@ -70,9 +73,11 @@ AC_DEFUN([gl_FUNC_LDEXPL_WORKS],
 extern long double ldexpl (long double, int);
 int main()
 {
-  volatile long double x = 1.0;
-  volatile long double y = ldexpl (x, -1);
-  return (y != 0.5L);
+  volatile long double x1 = 1.0;
+  volatile long double y1 = ldexpl (x1, -1);
+  volatile long double x2 = 1.73205L;
+  volatile long double y2 = ldexpl (x2, 0);
+  return (y1 != 0.5L) || (y2 != x2);
 }], [gl_cv_func_ldexpl_works=yes], [gl_cv_func_ldexpl_works=no],
       [case "$host_os" in
          aix*) gl_cv_func_ldexpl_works="guessing no";;