# Enable extensions on systems that normally disable them. # 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 file is only needed in autoconf <= 2.59. Newer versions of autoconf # have a macro AC_USE_SYSTEM_EXTENSIONS with identical semantics. # gl_USE_SYSTEM_EXTENSIONS # ------------------------ # Enable extensions on systems that normally disable them, # typically due to standards-conformance issues. AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS], [ AC_BEFORE([$0], [AC_COMPILE_IFELSE]) AC_BEFORE([$0], [AC_RUN_IFELSE]) AC_REQUIRE([AC_GNU_SOURCE]) AC_REQUIRE([AC_AIX]) AC_REQUIRE([AC_MINIX]) AH_VERBATIM([__EXTENSIONS__], [/* Enable extensions on Solaris. */ #ifndef __EXTENSIONS__ # undef __EXTENSIONS__ #endif #ifndef _POSIX_PTHREAD_SEMANTICS # undef _POSIX_PTHREAD_SEMANTICS #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([_POSIX_PTHREAD_SEMANTICS]) ])