diff options
Diffstat (limited to 'm4/extensions.m4')
| -rw-r--r-- | m4/extensions.m4 | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/m4/extensions.m4 b/m4/extensions.m4 index 4976079..143a9e5 100644 --- a/m4/extensions.m4 +++ b/m4/extensions.m4 @@ -1,3 +1,4 @@ +# serial 4 -*- Autoconf -*- # Enable extensions on systems that normally disable them. # Copyright (C) 2003, 2006 Free Software Foundation, Inc. @@ -5,14 +6,18 @@ # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. -# This file is only needed in autoconf <= 2.59. Newer versions of autoconf -# have a macro AC_USE_SYSTEM_EXTENSIONS with identical semantics. +# This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS +# Autoconf. Perhaps we can remove this once we can assume Autoconf +# 2.61 or later everywhere, but since CVS Autoconf mutates rapidly +# enough in this area it's likely we'll need to redefine +# AC_USE_SYSTEM_EXTENSIONS for quite some time. -# gl_USE_SYSTEM_EXTENSIONS +# AC_USE_SYSTEM_EXTENSIONS # ------------------------ # Enable extensions on systems that normally disable them, # typically due to standards-conformance issues. -AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS], [ +AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS], +[ AC_BEFORE([$0], [AC_COMPILE_IFELSE]) AC_BEFORE([$0], [AC_RUN_IFELSE]) @@ -27,16 +32,27 @@ AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS], [ #endif #ifndef _POSIX_PTHREAD_SEMANTICS # undef _POSIX_PTHREAD_SEMANTICS +#endif +#ifndef _TANDEM_SOURCE +# undef _TANDEM_SOURCE #endif]) AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], [ac_cv_safe_to_define___extensions__], [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([ - #define __EXTENSIONS__ 1 +# define __EXTENSIONS__ 1 AC_INCLUDES_DEFAULT])], [ac_cv_safe_to_define___extensions__=yes], [ac_cv_safe_to_define___extensions__=no])]) test $ac_cv_safe_to_define___extensions__ = yes && AC_DEFINE([__EXTENSIONS__]) AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) + AC_DEFINE([_TANDEM_SOURCE]) ]) + +# gl_USE_SYSTEM_EXTENSIONS +# ------------------------ +# Enable extensions on systems that normally disable them, +# typically due to standards-conformance issues. +AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS], + [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])]) |