changeset 16399:bffe229960ad

tanl: Provide function definition on MSVC. * m4/tanl.m4 (gl_FUNC_TANL): Test also whether tanl can be used as a function pointer. * lib/math.in.h (tanl): Undefine if it does not exist as a function.
author Bruno Haible <bruno@clisp.org>
date Sat, 25 Feb 2012 01:36:41 +0100
parents 5c120a4f2e73
children 7f26a7ed91f4
files ChangeLog lib/math.in.h m4/tanl.m4
diffstat 3 files changed, 15 insertions(+), 3 deletions(-) [+]
line wrap: on
line diff
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2012-02-24  Bruno Haible  <bruno@clisp.org>
+
+	tanl: Provide function definition on MSVC.
+	* m4/tanl.m4 (gl_FUNC_TANL): Test also whether tanl can be used as a
+	function pointer.
+	* lib/math.in.h (tanl): Undefine if it does not exist as a function.
+
 2012-02-24  Bruno Haible  <bruno@clisp.org>
 
 	cosl: Provide function definition on MSVC.
--- a/lib/math.in.h
+++ b/lib/math.in.h
@@ -1039,6 +1039,7 @@
 
 #if @GNULIB_TANL@
 # if !@HAVE_TANL@ || !@HAVE_DECL_TANL@
+#  undef tanl
 _GL_FUNCDECL_SYS (tanl, long double, (long double x));
 # endif
 _GL_CXXALIAS_SYS (tanl, long double, (long double x));
--- a/m4/tanl.m4
+++ b/m4/tanl.m4
@@ -1,4 +1,4 @@
-# tanl.m4 serial 6
+# tanl.m4 serial 7
 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) = tanl;
              long double x;]],
-           [[return tanl (x) > 0.4;]])],
+           [[return funcptr (x) > 0.4
+                    || tanl (x) > 0.4;]])],
         [gl_cv_func_tanl_no_libm=yes],
         [gl_cv_func_tanl_no_libm=no])
     ])
@@ -39,8 +41,10 @@
                # define __NO_MATH_INLINES 1 /* for glibc */
                #endif
                #include <math.h>
+               long double (*funcptr) (long double) = tanl;
                long double x;]],
-             [[return tanl (x) > 0.4;]])],
+             [[return funcptr (x) > 0.4
+                      || tanl (x) > 0.4;]])],
           [gl_cv_func_tanl_in_libm=yes],
           [gl_cv_func_tanl_in_libm=no])
         LIBS="$save_LIBS"