diff options
Diffstat (limited to 'm4/extensions.m4')
| -rw-r--r-- | m4/extensions.m4 | 100 |
1 files changed, 20 insertions, 80 deletions
diff --git a/m4/extensions.m4 b/m4/extensions.m4 index 7d9458a..143a9e5 100644 --- a/m4/extensions.m4 +++ b/m4/extensions.m4 @@ -1,118 +1,58 @@ -# serial 9 -*- Autoconf -*- +# serial 4 -*- Autoconf -*- # Enable extensions on systems that normally disable them. -# Copyright (C) 2003, 2006-2010 Free Software Foundation, Inc. +# Copyright (C) 2003, 2006 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 -# 2.62 or later everywhere, but since CVS Autoconf mutates rapidly +# 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. -# If autoconf reports a warning -# warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS -# or warning: AC_RUN_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS -# the fix is -# 1) to ensure that AC_USE_SYSTEM_EXTENSIONS is never directly invoked -# but always AC_REQUIREd, -# 2) to ensure that for each occurrence of -# AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) -# or -# AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) -# the corresponding gnulib module description has 'extensions' among -# its dependencies. This will ensure that the gl_USE_SYSTEM_EXTENSIONS -# invocation occurs in gl_EARLY, not in gl_INIT. - # AC_USE_SYSTEM_EXTENSIONS # ------------------------ # 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_ONCE([AC_USE_SYSTEM_EXTENSIONS], -[AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl -AC_BEFORE([$0], [AC_RUN_IFELSE])dnl - - AC_REQUIRE([AC_CANONICAL_HOST]) - - AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=]) - if test "$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 +AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS], +[ + AC_BEFORE([$0], [AC_COMPILE_IFELSE]) + AC_BEFORE([$0], [AC_RUN_IFELSE]) - dnl HP-UX 11.11 defines mbstate_t only if _XOPEN_SOURCE is defined to 500, - dnl regardless of whether the flags -Ae or _D_HPUX_SOURCE=1 are already - dnl provided. - case "$host_os" in - hpux*) - AC_DEFINE([_XOPEN_SOURCE], [500], - [Define to 500 only on HP-UX.]) - ;; - esac + AC_REQUIRE([AC_GNU_SOURCE]) + AC_REQUIRE([AC_AIX]) + AC_REQUIRE([AC_MINIX]) AH_VERBATIM([__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 +[/* Enable extensions on Solaris. */ +#ifndef __EXTENSIONS__ +# undef __EXTENSIONS__ #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 -/* Enable general extensions on Solaris. */ -#ifndef __EXTENSIONS__ -# undef __EXTENSIONS__ -#endif -]) +#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 - ]AC_INCLUDES_DEFAULT])], + [AC_LANG_PROGRAM([ +# 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([_ALL_SOURCE]) - AC_DEFINE([_GNU_SOURCE]) AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) AC_DEFINE([_TANDEM_SOURCE]) -])# AC_USE_SYSTEM_EXTENSIONS +]) # gl_USE_SYSTEM_EXTENSIONS # ------------------------ # Enable extensions on systems that normally disable them, # typically due to standards-conformance issues. -AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS], -[ - dnl Require this macro before AC_USE_SYSTEM_EXTENSIONS. - dnl gnulib does not need it. But if it gets required by third-party macros - dnl after AC_USE_SYSTEM_EXTENSIONS is required, autoconf 2.62..2.63 emit a - dnl warning: "AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS". - dnl Note: We can do this only for one of the macros AC_AIX, AC_GNU_SOURCE, - dnl AC_MINIX. If people still use AC_AIX or AC_MINIX, they are out of luck. - AC_REQUIRE([AC_GNU_SOURCE]) - - AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) -]) +AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS], + [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])]) |