# HG changeset patch
# User Bruno Haible <bruno@clisp.org>
# Date 1330129468 -3600
# Node ID 68bd0cc2f6ddbdb97297c25df5761dc8c4ec9b6f
# Parent  11a860d6f42d8eb36c8c056b6cc695d6b2e1ba19
expl: Provide function definition on MSVC.

* m4/expl.m4 (gl_FUNC_EXPL): Test also whether expl can be used as a
function pointer.
* lib/math.in.h (expl): Undefine if it does not exist as a function.

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2012-02-24  Bruno Haible  <bruno@clisp.org>
+
+	expl: Provide function definition on MSVC.
+	* m4/expl.m4 (gl_FUNC_EXPL): Test also whether expl can be used as a
+	function pointer.
+	* lib/math.in.h (expl): Undefine if it does not exist as a function.
+
 2012-02-24  Bruno Haible  <bruno@clisp.org>
 
 	sqrtl: Provide function definition on MSVC.
diff --git a/lib/math.in.h b/lib/math.in.h
--- a/lib/math.in.h
+++ b/lib/math.in.h
@@ -420,6 +420,7 @@
 
 #if @GNULIB_EXPL@
 # if !@HAVE_EXPL@ || !@HAVE_DECL_EXPL@
+#  undef expl
 _GL_FUNCDECL_SYS (expl, long double, (long double x));
 # endif
 _GL_CXXALIAS_SYS (expl, long double, (long double x));
diff --git a/m4/expl.m4 b/m4/expl.m4
--- a/m4/expl.m4
+++ b/m4/expl.m4
@@ -1,4 +1,4 @@
-# expl.m4 serial 5
+# expl.m4 serial 6
 dnl Copyright (C) 2010-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -22,8 +22,10 @@
              # define __NO_MATH_INLINES 1 /* for glibc */
              #endif
              #include <math.h>
+             long double (*funcptr) (long double) = expl;
              long double x;]],
-           [[return expl (x) > 1.5;]])],
+           [[return funcptr (x) > 1.5
+                    || expl (x) > 1.5;]])],
         [gl_cv_func_expl_no_libm=yes],
         [gl_cv_func_expl_no_libm=no])
     ])
@@ -39,8 +41,10 @@
                # define __NO_MATH_INLINES 1 /* for glibc */
                #endif
                #include <math.h>
+               long double (*funcptr) (long double) = expl;
                long double x;]],
-             [[return expl (x) > 1.5;]])],
+             [[return funcptr (x) > 1.5
+                      || expl (x) > 1.5;]])],
           [gl_cv_func_expl_in_libm=yes],
           [gl_cv_func_expl_in_libm=no])
         LIBS="$save_LIBS"