X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ffrexpl.m4;h=e2722910c1219eefaa88de50f393c32e94d7046f;hb=cd56634a4a8179fd5a4419fbb3e27211b042ab1c;hp=91f2a357b6f606df722c5973bf4d28cd752c9061;hpb=2408f02086a20c0a02241cd4a1cf11f126a95fe3;p=gnulib.git

diff --git a/m4/frexpl.m4 b/m4/frexpl.m4
index 91f2a357b..e2722910c 100644
--- a/m4/frexpl.m4
+++ b/m4/frexpl.m4
@@ -1,5 +1,5 @@
-# frexpl.m4 serial 18
-dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
+# frexpl.m4 serial 20
+dnl Copyright (C) 2007-2014 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.
@@ -8,9 +8,14 @@ AC_DEFUN([gl_FUNC_FREXPL],
 [
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
+  dnl Persuade glibc <math.h> to declare frexpl().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
   dnl Check whether it's declared.
-  dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.
+  dnl Mac OS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.
   AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [[#include <math.h>]])
+
   FREXPL_LIBM=
   if test $HAVE_DECL_FREXPL = 1; then
     gl_CHECK_FREXPL_NO_LIBM
@@ -68,7 +73,7 @@ AC_DEFUN([gl_FUNC_FREXPL_NO_LIBM],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
   dnl Check whether it's declared.
-  dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.
+  dnl Mac OS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.
   AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [[#include <math.h>]])
   if test $HAVE_DECL_FREXPL = 1; then
     gl_CHECK_FREXPL_NO_LIBM
@@ -108,8 +113,8 @@ AC_DEFUN([gl_CHECK_FREXPL_NO_LIBM],
 ])
 
 dnl Test whether frexpl() works on finite numbers (this fails on
-dnl MacOS X 10.4/PowerPC, on AIX 5.1, and on BeOS), on denormalized numbers
-dnl (this fails on MacOS X 10.5/i386), and also on infinite numbers (this
+dnl Mac OS X 10.4/PowerPC, on AIX 5.1, and on BeOS), on denormalized numbers
+dnl (this fails on Mac OS X 10.5/i386), and also on infinite numbers (this
 dnl fails e.g. on IRIX 6.5 and mingw).
 AC_DEFUN([gl_FUNC_FREXPL_WORKS],
 [
@@ -157,7 +162,7 @@ int main()
     if (exp != 5)
       result |= 1;
   }
-  /* Test on finite numbers that fails on MacOS X 10.4, because its frexpl
+  /* Test on finite numbers that fails on Mac OS X 10.4, because its frexpl
      function returns an invalid (incorrectly normalized) value: it returns
                y = { 0x3fe028f5, 0xc28f5c28, 0x3c9eb851, 0xeb851eb8 }
      but the correct result is
@@ -196,7 +201,7 @@ int main()
         int exp;
         long double y = frexpl (x, &exp);
         /* On machines with IEEE854 arithmetic: x = 1.68105e-4932,
-           exp = -16382, y = 0.5.  On MacOS X 10.5: exp = -16384, y = 0.5.  */
+           exp = -16382, y = 0.5.  On Mac OS X 10.5: exp = -16384, y = 0.5.  */
         if (exp != LDBL_MIN_EXP - 1)
           result |= 8;
       }