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.

diff --git a/ChangeLog b/ChangeLog
index 5de730b..1266136 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
 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.
        * m4/cosl.m4 (gl_FUNC_COSL): Test also whether cosl can be used as a
        function pointer.

diff --git a/lib/math.in.h b/lib/math.in.h
index 3de111e..0143b03 100644 (file)
--- a/lib/math.in.h
+++ b/lib/math.in.h
@@ -1039,6 +1039,7 @@ _GL_WARN_ON_USE (tanf, "tanf is unportable - "
 
 #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));

diff --git a/m4/tanl.m4 b/m4/tanl.m4
index 5ec2f16..7694a6c 100644 (file)
--- 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 @@ AC_DEFUN([gl_FUNC_TANL],
              # 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 @@ AC_DEFUN([gl_FUNC_TANL],
                # 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"