X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fmathfunc.m4;h=40a27b4b2961681f82579a2f6d4c48c6485ff659;hb=39e1adf83f9afbbc1ab9edbd6ca3d509c1f1bec4;hp=92faac904547bcf1a7139c8a88d7ca887a6e334f;hpb=2daa8387d5416785defb09fa4f30a86e42275079;p=gnulib.git

diff --git a/m4/mathfunc.m4 b/m4/mathfunc.m4
index 92faac904..40a27b4b2 100644
--- a/m4/mathfunc.m4
+++ b/m4/mathfunc.m4
@@ -1,5 +1,5 @@
-# mathfunc.m4 serial 5
-dnl Copyright (C) 2010 Free Software Foundation, Inc.
+# mathfunc.m4 serial 6
+dnl Copyright (C) 2010-2011 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.
@@ -24,12 +24,16 @@ AC_DEFUN([gl_MATHFUNC],
     [gl_cv_func_]func[_no_libm],
     [
       AC_LINK_IFELSE(
-        [AC_LANG_PROGRAM([[#ifndef __NO_MATH_INLINES
-                           # define __NO_MATH_INLINES 1 /* for glibc */
-                           #endif
-                           #include <math.h>
-                           $2 (*funcptr) $3 = ]func[;]],
-                         [[return 0;]])],
+        [AC_LANG_PROGRAM(
+           [[#ifndef __NO_MATH_INLINES
+             # define __NO_MATH_INLINES 1 /* for glibc */
+             #endif
+             #include <math.h>
+             $2 (*funcptr) $3 = ]func[;
+             double d_ret;]],
+           [[$2 y = funcptr ]m4_bpatsubst([m4_bpatsubst([m4_bpatsubst([$3], [int], [2])], [double \*], [&d_ret])], [double], [1.6180339887])[;
+             return y < 0.3 || y > 1.7;
+           ]])],
         [gl_cv_func_]func[_no_libm=yes],
         [gl_cv_func_]func[_no_libm=no])
     ])
@@ -40,12 +44,16 @@ AC_DEFUN([gl_MATHFUNC],
         save_LIBS="$LIBS"
         LIBS="$LIBS -lm"
         AC_LINK_IFELSE(
-          [AC_LANG_PROGRAM([[#ifndef __NO_MATH_INLINES
-                             # define __NO_MATH_INLINES 1 /* for glibc */
-                             #endif
-                             #include <math.h>
-                             $2 (*funcptr) $3 = ]func[;]],
-                           [[return 0;]])],
+          [AC_LANG_PROGRAM(
+             [[#ifndef __NO_MATH_INLINES
+               # define __NO_MATH_INLINES 1 /* for glibc */
+               #endif
+               #include <math.h>
+               $2 (*funcptr) $3 = ]func[;
+               double d_ret;]],
+             [[$2 y = funcptr ]m4_bpatsubst([m4_bpatsubst([m4_bpatsubst([$3], [int], [2])], [double \*], [&d_ret])], [double], [1.6180339887])[;
+               return y < 0.3 || y > 1.7;
+             ]])],
           [gl_cv_func_]func[_in_libm=yes],
           [gl_cv_func_]func[_in_libm=no])
         LIBS="$save_LIBS"