| The Android Open Source Project | b7f2b4d | 2008-12-17 18:04:06 -0800 | [diff] [blame^] | 1 | # Enable extensions on systems that normally disable them. |
| 2 | |
| 3 | # Copyright (C) 2003, 2006 Free Software Foundation, Inc. |
| 4 | # This file is free software; the Free Software Foundation |
| 5 | # gives unlimited permission to copy and/or distribute it, |
| 6 | # with or without modifications, as long as this notice is preserved. |
| 7 | |
| 8 | # This file is only needed in autoconf <= 2.59. Newer versions of autoconf |
| 9 | # have a macro AC_USE_SYSTEM_EXTENSIONS with identical semantics. |
| 10 | |
| 11 | # gl_USE_SYSTEM_EXTENSIONS |
| 12 | # ------------------------ |
| 13 | # Enable extensions on systems that normally disable them, |
| 14 | # typically due to standards-conformance issues. |
| 15 | AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS], [ |
| 16 | AC_BEFORE([$0], [AC_COMPILE_IFELSE]) |
| 17 | AC_BEFORE([$0], [AC_RUN_IFELSE]) |
| 18 | |
| 19 | AC_REQUIRE([AC_GNU_SOURCE]) |
| 20 | AC_REQUIRE([AC_AIX]) |
| 21 | AC_REQUIRE([AC_MINIX]) |
| 22 | |
| 23 | AH_VERBATIM([__EXTENSIONS__], |
| 24 | [/* Enable extensions on Solaris. */ |
| 25 | #ifndef __EXTENSIONS__ |
| 26 | # undef __EXTENSIONS__ |
| 27 | #endif |
| 28 | #ifndef _POSIX_PTHREAD_SEMANTICS |
| 29 | # undef _POSIX_PTHREAD_SEMANTICS |
| 30 | #endif]) |
| 31 | AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], |
| 32 | [ac_cv_safe_to_define___extensions__], |
| 33 | [AC_COMPILE_IFELSE( |
| 34 | [AC_LANG_PROGRAM([ |
| 35 | #define __EXTENSIONS__ 1 |
| 36 | AC_INCLUDES_DEFAULT])], |
| 37 | [ac_cv_safe_to_define___extensions__=yes], |
| 38 | [ac_cv_safe_to_define___extensions__=no])]) |
| 39 | test $ac_cv_safe_to_define___extensions__ = yes && |
| 40 | AC_DEFINE([__EXTENSIONS__]) |
| 41 | AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) |
| 42 | ]) |