projects / deliverable / binutils-gdb.git / blame
| Commit | Line | Data |
|---|---|---|
| 5bb4d8de | 1 | # serial 6 -*- Autoconf -*- |
| c779bab8 PB |
2 | # Enable extensions on systems that normally disable them. |
| 3 | ||
| 5bb4d8de | 4 | # Copyright (C) 2003, 2006, 2007, 2009 Free Software Foundation, Inc. |
| c779bab8 PB |
5 | # This file is free software; the Free Software Foundation |
| 6 | # gives unlimited permission to copy and/or distribute it, | |
| 7 | # with or without modifications, as long as this notice is preserved. | |
| 8 | ||
| 9 | # This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS | |
| 10 | # Autoconf. Perhaps we can remove this once we can assume Autoconf | |
| 11 | # 2.62 or later everywhere, but since CVS Autoconf mutates rapidly | |
| 12 | # enough in this area it's likely we'll need to redefine | |
| 13 | # AC_USE_SYSTEM_EXTENSIONS for quite some time. | |
| 14 | ||
| 5bb4d8de RW |
15 | m4_version_prereq([2.62],, [ |
| 16 | ||
| c779bab8 PB |
17 | # AC_USE_SYSTEM_EXTENSIONS |
| 18 | # ------------------------ | |
| 19 | # Enable extensions on systems that normally disable them, | |
| 20 | # typically due to standards-conformance issues. | |
| 21 | # Remember that #undef in AH_VERBATIM gets replaced with #define by | |
| 22 | # AC_DEFINE. The goal here is to define all known feature-enabling | |
| 23 | # macros, then, if reports of conflicts are made, disable macros that | |
| 24 | # cause problems on some platforms (such as __EXTENSIONS__). | |
| 25 | AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS], | |
| 26 | [AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl | |
| 27 | AC_BEFORE([$0], [AC_RUN_IFELSE])dnl | |
| 28 | ||
| 29 | AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=]) | |
| 30 | if test "$MINIX" = yes; then | |
| 31 | AC_DEFINE([_POSIX_SOURCE], [1], | |
| 32 | [Define to 1 if you need to in order for `stat' and other | |
| 33 | things to work.]) | |
| 34 | AC_DEFINE([_POSIX_1_SOURCE], [2], | |
| 35 | [Define to 2 if the system does not provide POSIX.1 features | |
| 36 | except with this defined.]) | |
| 37 | AC_DEFINE([_MINIX], [1], | |
| 38 | [Define to 1 if on MINIX.]) | |
| 39 | fi | |
| 40 | ||
| 41 | AH_VERBATIM([__EXTENSIONS__], | |
| 42 | [/* Enable extensions on AIX 3, Interix. */ | |
| 43 | #ifndef _ALL_SOURCE | |
| 44 | # undef _ALL_SOURCE | |
| 45 | #endif | |
| 46 | /* Enable GNU extensions on systems that have them. */ | |
| 47 | #ifndef _GNU_SOURCE | |
| 48 | # undef _GNU_SOURCE | |
| 49 | #endif | |
| 50 | /* Enable threading extensions on Solaris. */ | |
| 51 | #ifndef _POSIX_PTHREAD_SEMANTICS | |
| 52 | # undef _POSIX_PTHREAD_SEMANTICS | |
| 53 | #endif | |
| 54 | /* Enable extensions on HP NonStop. */ | |
| 55 | #ifndef _TANDEM_SOURCE | |
| 56 | # undef _TANDEM_SOURCE | |
| 57 | #endif | |
| 58 | /* Enable general extensions on Solaris. */ | |
| 59 | #ifndef __EXTENSIONS__ | |
| 60 | # undef __EXTENSIONS__ | |
| 61 | #endif | |
| 62 | ]) | |
| 63 | AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], | |
| 64 | [ac_cv_safe_to_define___extensions__], | |
| 65 | [AC_COMPILE_IFELSE( | |
| 66 | [AC_LANG_PROGRAM([ | |
| 67 | # define __EXTENSIONS__ 1 | |
| 68 | AC_INCLUDES_DEFAULT])], | |
| 69 | [ac_cv_safe_to_define___extensions__=yes], | |
| 70 | [ac_cv_safe_to_define___extensions__=no])]) | |
| 71 | test $ac_cv_safe_to_define___extensions__ = yes && | |
| 72 | AC_DEFINE([__EXTENSIONS__]) | |
| 73 | AC_DEFINE([_ALL_SOURCE]) | |
| 74 | AC_DEFINE([_GNU_SOURCE]) | |
| 75 | AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) | |
| 76 | AC_DEFINE([_TANDEM_SOURCE]) | |
| 77 | ])# AC_USE_SYSTEM_EXTENSIONS | |
| 78 | ||
| 5bb4d8de | 79 | ]) |