ncurses 5.6 - patch 20080816

[ncurses.git] / aclocal.m4

diff --git a/aclocal.m4 b/aclocal.m4
index 0c15200e20bdfc1daf7c0f266b7c0a30d957661c..cc6f03d49a511563f95bed776edbf1c2ff27ae06 100644 (file)
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -28,7 +28,7 @@ dnl***************************************************************************
 dnl
 dnl Author: Thomas E. Dickey 1995-on
 dnl
 dnl
 dnl Author: Thomas E. Dickey 1995-on
 dnl

-dnl $Id: aclocal.m4,v 1.451 2008/08/04 10:26:11 tom Exp $
+dnl $Id: aclocal.m4,v 1.452 2008/08/16 23:19:46 tom Exp $

 dnl Macros used in NCURSES auto-configuration script.
 dnl
 dnl These macros are maintained separately from NCURSES.  The copyright on
 dnl Macros used in NCURSES auto-configuration script.
 dnl
 dnl These macros are maintained separately from NCURSES.  The copyright on


@@ -4862,6 +4862,32 @@ fi
 ])
 ])dnl
 dnl ---------------------------------------------------------------------------
 ])
 ])dnl
 dnl ---------------------------------------------------------------------------

+dnl CF_WEAK_SYMBOLS version: 1 updated: 2008/08/16 19:18:06
+dnl ---------------
+dnl Check for compiler-support for weak symbols.
+dnl This works with "recent" gcc.
+AC_DEFUN([CF_WEAK_SYMBOLS],[
+AC_CACHE_CHECK(if $CC supports weak symbols,cf_cv_weak_symbols,[
+
+AC_TRY_COMPILE([
+#include <stdio.h>],
+[
+#if defined(__GNUC__)
+#  if defined __USE_ISOC99
+#    define _cat_pragma(exp)   _Pragma(#exp)
+#    define _weak_pragma(exp)  _cat_pragma(weak name)
+#  else
+#    define _weak_pragma(exp)
+#  endif
+#  define _declare(name)       __extension__ extern __typeof__(name) name
+#  define weak_symbol(name)    _weak_pragma(name) _declare(name) __attribute__((weak))
+#endif
+
+weak_symbol(fopen);
+],[cf_cv_weak_symbols=yes],[cf_cv_weak_symbols=no])
+])
+])dnl
+dnl ---------------------------------------------------------------------------

 dnl CF_WITH_ABI_VERSION version: 1 updated: 2003/09/20 18:12:49
 dnl -------------------
 dnl Allow library's ABI to be overridden.  Generally this happens when a
 dnl CF_WITH_ABI_VERSION version: 1 updated: 2003/09/20 18:12:49
 dnl -------------------
 dnl Allow library's ABI to be overridden.  Generally this happens when a