1# serial 5 -*- Autoconf -*- 2# Enable extensions on systems that normally disable them. 3 4# Copyright (C) 2003, 2006, 2007 Free Software Foundation, Inc. 5# This file is free software; the Free Software Foundation 6# gives unlimited permission to copy and/or distribute it, 7# with or without modifications, as long as this notice is preserved. 8 9# This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS 10# Autoconf. Perhaps we can remove this once we can assume Autoconf 11# 2.62 or later everywhere, but since CVS Autoconf mutates rapidly 12# enough in this area it's likely we'll need to redefine 13# AC_USE_SYSTEM_EXTENSIONS for quite some time. 14 15# AC_USE_SYSTEM_EXTENSIONS 16# ------------------------ 17# Enable extensions on systems that normally disable them, 18# typically due to standards-conformance issues. 19# Remember that #undef in AH_VERBATIM gets replaced with #define by 20# AC_DEFINE. The goal here is to define all known feature-enabling 21# macros, then, if reports of conflicts are made, disable macros that 22# cause problems on some platforms (such as __EXTENSIONS__). 23AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS], 24[AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl 25AC_BEFORE([$0], [AC_RUN_IFELSE])dnl 26 27 AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=]) 28 if test "$MINIX" = yes; then 29 AC_DEFINE([_POSIX_SOURCE], [1], 30 [Define to 1 if you need to in order for `stat' and other 31 things to work.]) 32 AC_DEFINE([_POSIX_1_SOURCE], [2], 33 [Define to 2 if the system does not provide POSIX.1 features 34 except with this defined.]) 35 AC_DEFINE([_MINIX], [1], 36 [Define to 1 if on MINIX.]) 37 fi 38 39 AH_VERBATIM([__EXTENSIONS__], 40[/* Enable extensions on AIX 3, Interix. */ 41#ifndef _ALL_SOURCE 42# undef _ALL_SOURCE 43#endif 44/* Enable GNU extensions on systems that have them. */ 45#ifndef _GNU_SOURCE 46# undef _GNU_SOURCE 47#endif 48/* Enable threading extensions on Solaris. */ 49#ifndef _POSIX_PTHREAD_SEMANTICS 50# undef _POSIX_PTHREAD_SEMANTICS 51#endif 52/* Enable extensions on HP NonStop. */ 53#ifndef _TANDEM_SOURCE 54# undef _TANDEM_SOURCE 55#endif 56/* Enable general extensions on Solaris. */ 57#ifndef __EXTENSIONS__ 58# undef __EXTENSIONS__ 59#endif 60]) 61 AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], 62 [ac_cv_safe_to_define___extensions__], 63 [AC_COMPILE_IFELSE( 64 [AC_LANG_PROGRAM([ 65# define __EXTENSIONS__ 1 66 AC_INCLUDES_DEFAULT])], 67 [ac_cv_safe_to_define___extensions__=yes], 68 [ac_cv_safe_to_define___extensions__=no])]) 69 test $ac_cv_safe_to_define___extensions__ = yes && 70 AC_DEFINE([__EXTENSIONS__]) 71 AC_DEFINE([_ALL_SOURCE]) 72 AC_DEFINE([_GNU_SOURCE]) 73 AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) 74 AC_DEFINE([_TANDEM_SOURCE]) 75])# AC_USE_SYSTEM_EXTENSIONS 76 77# gl_USE_SYSTEM_EXTENSIONS 78# ------------------------ 79# Enable extensions on systems that normally disable them, 80# typically due to standards-conformance issues. 81AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS], 82 [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])]) 83