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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [config/] [extensions.m4] - Rev 144
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# serial 6 -*- Autoconf -*- # Enable extensions on systems that normally disable them. # Copyright (C) 2003, 2006, 2007, 2009 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 # enough in this area it's likely we'll need to redefine # AC_USE_SYSTEM_EXTENSIONS for quite some time. m4_version_prereq([2.62],, [ # 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([AC_USE_SYSTEM_EXTENSIONS], [AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl AC_BEFORE([$0], [AC_RUN_IFELSE])dnl AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=]) if test "$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 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 /* 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( [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 ])
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