| kenton@google.com | 25bc5cd | 2008-12-04 20:34:50 +0000 | [diff] [blame] | 1 | dnl Provide AC_USE_SYSTEM_EXTENSIONS for old autoconf machines. |
| 2 | AC_DEFUN([ACX_USE_SYSTEM_EXTENSIONS],[ |
| 3 | ifdef([AC_USE_SYSTEM_EXTENSIONS],[ |
| 4 | AC_USE_SYSTEM_EXTENSIONS |
| 5 | ],[ |
| 6 | AC_BEFORE([$0], [AC_COMPILE_IFELSE]) |
| 7 | AC_BEFORE([$0], [AC_RUN_IFELSE]) |
| 8 | |
| 9 | AC_REQUIRE([AC_GNU_SOURCE]) |
| 10 | AC_REQUIRE([AC_AIX]) |
| 11 | AC_REQUIRE([AC_MINIX]) |
| 12 | |
| 13 | AH_VERBATIM([__EXTENSIONS__], |
| 14 | [/* Enable extensions on Solaris. */ |
| 15 | #ifndef __EXTENSIONS__ |
| 16 | # undef __EXTENSIONS__ |
| 17 | #endif |
| 18 | #ifndef _POSIX_PTHREAD_SEMANTICS |
| 19 | # undef _POSIX_PTHREAD_SEMANTICS |
| 20 | #endif |
| 21 | #ifndef _TANDEM_SOURCE |
| 22 | # undef _TANDEM_SOURCE |
| 23 | #endif]) |
| 24 | AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], |
| 25 | [ac_cv_safe_to_define___extensions__], |
| 26 | [AC_COMPILE_IFELSE( |
| 27 | [AC_LANG_PROGRAM([ |
| 28 | # define __EXTENSIONS__ 1 |
| 29 | AC_INCLUDES_DEFAULT])], |
| 30 | [ac_cv_safe_to_define___extensions__=yes], |
| 31 | [ac_cv_safe_to_define___extensions__=no])]) |
| 32 | test $ac_cv_safe_to_define___extensions__ = yes && |
| 33 | AC_DEFINE([__EXTENSIONS__]) |
| 34 | AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) |
| 35 | AC_DEFINE([_TANDEM_SOURCE]) |
| 36 | ]) |
| 37 | ]) |