diff options
Diffstat (limited to 'm4/extensions.m4')
| -rw-r--r-- | m4/extensions.m4 | 56 |
1 files changed, 38 insertions, 18 deletions
diff --git a/m4/extensions.m4 b/m4/extensions.m4 index 1330503..e30f122 100644 --- a/m4/extensions.m4 +++ b/m4/extensions.m4 @@ -1,14 +1,14 @@ -# serial 9 -*- Autoconf -*- +# serial 13 -*- Autoconf -*- # Enable extensions on systems that normally disable them. -# Copyright (C) 2003, 2006-2011 Free Software Foundation, Inc. +# Copyright (C) 2003, 2006-2013 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 +# This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from git # Autoconf. Perhaps we can remove this once we can assume Autoconf -# 2.62 or later everywhere, but since CVS Autoconf mutates rapidly +# 2.70 or later everywhere, but since Autoconf mutates rapidly # enough in this area it's likely we'll need to redefine # AC_USE_SYSTEM_EXTENSIONS for quite some time. @@ -30,6 +30,7 @@ # ------------------------ # 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 @@ -38,35 +39,31 @@ 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 + [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.]) + AC_DEFINE([_NETBSD_SOURCE], [1], + [Define to 1 to make NetBSD features available. MINIX 3 needs this.]) fi - 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 - - AH_VERBATIM([__EXTENSIONS__], +dnl Use a different key than __EXTENSIONS__, as that name broke existing +dnl configure.ac when using autoheader 2.62. + AH_VERBATIM([USE_SYSTEM_EXTENSIONS], [/* Enable extensions on AIX 3, Interix. */ #ifndef _ALL_SOURCE # undef _ALL_SOURCE #endif +/* Enable general extensions on OS X. */ +#ifndef _DARWIN_C_SOURCE +# undef _DARWIN_C_SOURCE +#endif /* Enable GNU extensions on systems that have them. */ #ifndef _GNU_SOURCE # undef _GNU_SOURCE @@ -79,6 +76,12 @@ AC_BEFORE([$0], [AC_RUN_IFELSE])dnl #ifndef _TANDEM_SOURCE # undef _TANDEM_SOURCE #endif +/* Enable X/Open extensions if necessary. HP-UX 11.11 defines + mbstate_t only if _XOPEN_SOURCE is defined to 500, regardless of + whether compiling with -Ae or -D_HPUX_SOURCE=1. */ +#ifndef _XOPEN_SOURCE +# undef _XOPEN_SOURCE +#endif /* Enable general extensions on Solaris. */ #ifndef __EXTENSIONS__ # undef __EXTENSIONS__ @@ -95,9 +98,26 @@ AC_BEFORE([$0], [AC_RUN_IFELSE])dnl test $ac_cv_safe_to_define___extensions__ = yes && AC_DEFINE([__EXTENSIONS__]) AC_DEFINE([_ALL_SOURCE]) + AC_DEFINE([_DARWIN_C_SOURCE]) AC_DEFINE([_GNU_SOURCE]) AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) AC_DEFINE([_TANDEM_SOURCE]) + AC_CACHE_CHECK([whether _XOPEN_SOURCE should be defined], + [ac_cv_should_define__xopen_source], + [ac_cv_should_define__xopen_source=no + AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM([[ + #include <wchar.h> + mbstate_t x;]])], + [], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM([[ + #define _XOPEN_SOURCE 500 + #include <wchar.h> + mbstate_t x;]])], + [ac_cv_should_define__xopen_source=yes])])]) + test $ac_cv_should_define__xopen_source = yes && + AC_DEFINE([_XOPEN_SOURCE], [500]) ])# AC_USE_SYSTEM_EXTENSIONS # gl_USE_SYSTEM_EXTENSIONS |