diff options
Diffstat (limited to 'gl/m4/extensions.m4')
| -rw-r--r-- | gl/m4/extensions.m4 | 52 |
1 files changed, 38 insertions, 14 deletions
diff --git a/gl/m4/extensions.m4 b/gl/m4/extensions.m4 index 143a9e54..bcbb3cee 100644 --- a/gl/m4/extensions.m4 +++ b/gl/m4/extensions.m4 @@ -1,14 +1,14 @@ -# serial 4 -*- Autoconf -*- +# serial 5 -*- Autoconf -*- # Enable extensions on systems that normally disable them. -# Copyright (C) 2003, 2006 Free Software Foundation, Inc. +# Copyright (C) 2003, 2006, 2007 Free Software Foundation, Inc. # This file is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. # 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 +# 2.62 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. @@ -16,26 +16,48 @@ # ------------------------ # Enable extensions on systems that normally disable them, # typically due to standards-conformance issues. +# Remember that #undef in AH_VERBATIM gets replaced with #define by +# AC_DEFINE. The goal here is to define all known feature-enabling +# macros, then, if reports of conflicts are made, disable macros that +# cause problems on some platforms (such as __EXTENSIONS__). AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS], -[ - AC_BEFORE([$0], [AC_COMPILE_IFELSE]) - AC_BEFORE([$0], [AC_RUN_IFELSE]) +[AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl +AC_BEFORE([$0], [AC_RUN_IFELSE])dnl - AC_REQUIRE([AC_GNU_SOURCE]) - AC_REQUIRE([AC_AIX]) - AC_REQUIRE([AC_MINIX]) + AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=]) + if test "$MINIX" = yes; then + AC_DEFINE([_POSIX_SOURCE], [1], + [Define to 1 if you need to in order for `stat' and other + things to work.]) + AC_DEFINE([_POSIX_1_SOURCE], [2], + [Define to 2 if the system does not provide POSIX.1 features + except with this defined.]) + AC_DEFINE([_MINIX], [1], + [Define to 1 if on MINIX.]) + fi AH_VERBATIM([__EXTENSIONS__], -[/* Enable extensions on Solaris. */ -#ifndef __EXTENSIONS__ -# undef __EXTENSIONS__ +[/* Enable extensions on AIX 3, Interix. */ +#ifndef _ALL_SOURCE +# undef _ALL_SOURCE +#endif +/* Enable GNU extensions on systems that have them. */ +#ifndef _GNU_SOURCE +# undef _GNU_SOURCE #endif +/* Enable threading extensions on Solaris. */ #ifndef _POSIX_PTHREAD_SEMANTICS # undef _POSIX_PTHREAD_SEMANTICS #endif +/* Enable extensions on HP NonStop. */ #ifndef _TANDEM_SOURCE # undef _TANDEM_SOURCE -#endif]) +#endif +/* Enable general extensions on Solaris. */ +#ifndef __EXTENSIONS__ +# undef __EXTENSIONS__ +#endif +]) AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], [ac_cv_safe_to_define___extensions__], [AC_COMPILE_IFELSE( @@ -46,9 +68,11 @@ AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS], [ac_cv_safe_to_define___extensions__=no])]) test $ac_cv_safe_to_define___extensions__ = yes && AC_DEFINE([__EXTENSIONS__]) + AC_DEFINE([_ALL_SOURCE]) + AC_DEFINE([_GNU_SOURCE]) AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) AC_DEFINE([_TANDEM_SOURCE]) -]) +])# AC_USE_SYSTEM_EXTENSIONS # gl_USE_SYSTEM_EXTENSIONS # ------------------------ |