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| 1 # serial 5 -*- Autoconf -*- |
| 2 # Enable extensions on systems that normally disable them. |
| 3 |
| 4 # Copyright (C) 2003, 2006-2008 Free Software Foundation, Inc. |
| 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 |
| 15 # AC_USE_SYSTEM_EXTENSIONS |
| 16 # ------------------------ |
| 17 # Enable extensions on systems that normally disable them, |
| 18 # typically due to standards-conformance issues. |
| 19 # Remember that #undef in AH_VERBATIM gets replaced with #define by |
| 20 # AC_DEFINE. The goal here is to define all known feature-enabling |
| 21 # macros, then, if reports of conflicts are made, disable macros that |
| 22 # cause problems on some platforms (such as __EXTENSIONS__). |
| 23 AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS], |
| 24 [AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl |
| 25 AC_BEFORE([$0], [AC_RUN_IFELSE])dnl |
| 26 |
| 27 AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=]) |
| 28 if test "$MINIX" = yes; then |
| 29 AC_DEFINE([_POSIX_SOURCE], [1], |
| 30 [Define to 1 if you need to in order for `stat' and other |
| 31 things to work.]) |
| 32 AC_DEFINE([_POSIX_1_SOURCE], [2], |
| 33 [Define to 2 if the system does not provide POSIX.1 features |
| 34 except with this defined.]) |
| 35 AC_DEFINE([_MINIX], [1], |
| 36 [Define to 1 if on MINIX.]) |
| 37 fi |
| 38 |
| 39 AH_VERBATIM([__EXTENSIONS__], |
| 40 [/* Enable extensions on AIX 3, Interix. */ |
| 41 #ifndef _ALL_SOURCE |
| 42 # undef _ALL_SOURCE |
| 43 #endif |
| 44 /* Enable GNU extensions on systems that have them. */ |
| 45 #ifndef _GNU_SOURCE |
| 46 # undef _GNU_SOURCE |
| 47 #endif |
| 48 /* Enable threading extensions on Solaris. */ |
| 49 #ifndef _POSIX_PTHREAD_SEMANTICS |
| 50 # undef _POSIX_PTHREAD_SEMANTICS |
| 51 #endif |
| 52 /* Enable extensions on HP NonStop. */ |
| 53 #ifndef _TANDEM_SOURCE |
| 54 # undef _TANDEM_SOURCE |
| 55 #endif |
| 56 /* Enable general extensions on Solaris. */ |
| 57 #ifndef __EXTENSIONS__ |
| 58 # undef __EXTENSIONS__ |
| 59 #endif |
| 60 ]) |
| 61 AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], |
| 62 [ac_cv_safe_to_define___extensions__], |
| 63 [AC_COMPILE_IFELSE( |
| 64 [AC_LANG_PROGRAM([[ |
| 65 # define __EXTENSIONS__ 1 |
| 66 ]AC_INCLUDES_DEFAULT])], |
| 67 [ac_cv_safe_to_define___extensions__=yes], |
| 68 [ac_cv_safe_to_define___extensions__=no])]) |
| 69 test $ac_cv_safe_to_define___extensions__ = yes && |
| 70 AC_DEFINE([__EXTENSIONS__]) |
| 71 AC_DEFINE([_ALL_SOURCE]) |
| 72 AC_DEFINE([_GNU_SOURCE]) |
| 73 AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) |
| 74 AC_DEFINE([_TANDEM_SOURCE]) |
| 75 ])# AC_USE_SYSTEM_EXTENSIONS |
| 76 |
| 77 # gl_USE_SYSTEM_EXTENSIONS |
| 78 # ------------------------ |
| 79 # Enable extensions on systems that normally disable them, |
| 80 # typically due to standards-conformance issues. |
| 81 AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS], |
| 82 [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])]) |
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