| dnl Provide AC_USE_SYSTEM_EXTENSIONS for old autoconf machines. |
| AC_DEFUN([ACX_USE_SYSTEM_EXTENSIONS],[ |
| ifdef([AC_USE_SYSTEM_EXTENSIONS],[ |
| AC_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 |
| #ifndef _TANDEM_SOURCE |
| # undef _TANDEM_SOURCE |
| #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]) |
| AC_DEFINE([_TANDEM_SOURCE]) |
| ]) |
| ]) |
