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118 lines
4.3 KiB
118 lines
4.3 KiB
# serial 9 -*- Autoconf -*- |
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# Enable extensions on systems that normally disable them. |
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# Copyright (C) 2003, 2006-2011 Free Software Foundation, Inc. |
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# This file is free software; the Free Software Foundation |
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# gives unlimited permission to copy and/or distribute it, |
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# with or without modifications, as long as this notice is preserved. |
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# This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS |
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# Autoconf. Perhaps we can remove this once we can assume Autoconf |
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# 2.62 or later everywhere, but since CVS Autoconf mutates rapidly |
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# enough in this area it's likely we'll need to redefine |
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# AC_USE_SYSTEM_EXTENSIONS for quite some time. |
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# If autoconf reports a warning |
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# warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS |
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# or warning: AC_RUN_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS |
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# the fix is |
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# 1) to ensure that AC_USE_SYSTEM_EXTENSIONS is never directly invoked |
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# but always AC_REQUIREd, |
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# 2) to ensure that for each occurrence of |
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# AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) |
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# or |
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# AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) |
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# the corresponding gnulib module description has 'extensions' among |
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# its dependencies. This will ensure that the gl_USE_SYSTEM_EXTENSIONS |
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# invocation occurs in gl_EARLY, not in gl_INIT. |
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# AC_USE_SYSTEM_EXTENSIONS |
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# ------------------------ |
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# Enable extensions on systems that normally disable them, |
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# typically due to standards-conformance issues. |
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# Remember that #undef in AH_VERBATIM gets replaced with #define by |
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# AC_DEFINE. The goal here is to define all known feature-enabling |
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# macros, then, if reports of conflicts are made, disable macros that |
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# cause problems on some platforms (such as __EXTENSIONS__). |
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AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS], |
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[AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl |
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AC_BEFORE([$0], [AC_RUN_IFELSE])dnl |
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AC_REQUIRE([AC_CANONICAL_HOST]) |
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AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=]) |
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if test "$MINIX" = yes; then |
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AC_DEFINE([_POSIX_SOURCE], [1], |
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[Define to 1 if you need to in order for `stat' and other |
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things to work.]) |
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AC_DEFINE([_POSIX_1_SOURCE], [2], |
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[Define to 2 if the system does not provide POSIX.1 features |
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except with this defined.]) |
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AC_DEFINE([_MINIX], [1], |
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[Define to 1 if on MINIX.]) |
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fi |
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dnl HP-UX 11.11 defines mbstate_t only if _XOPEN_SOURCE is defined to 500, |
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dnl regardless of whether the flags -Ae or _D_HPUX_SOURCE=1 are already |
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dnl provided. |
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case "$host_os" in |
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hpux*) |
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AC_DEFINE([_XOPEN_SOURCE], [500], |
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[Define to 500 only on HP-UX.]) |
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;; |
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esac |
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AH_VERBATIM([__EXTENSIONS__], |
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[/* Enable extensions on AIX 3, Interix. */ |
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#ifndef _ALL_SOURCE |
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# undef _ALL_SOURCE |
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#endif |
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/* Enable GNU extensions on systems that have them. */ |
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#ifndef _GNU_SOURCE |
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# undef _GNU_SOURCE |
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#endif |
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/* Enable threading extensions on Solaris. */ |
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#ifndef _POSIX_PTHREAD_SEMANTICS |
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# undef _POSIX_PTHREAD_SEMANTICS |
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#endif |
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/* Enable extensions on HP NonStop. */ |
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#ifndef _TANDEM_SOURCE |
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# undef _TANDEM_SOURCE |
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#endif |
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/* Enable general extensions on Solaris. */ |
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#ifndef __EXTENSIONS__ |
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# undef __EXTENSIONS__ |
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#endif |
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]) |
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AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], |
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[ac_cv_safe_to_define___extensions__], |
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[AC_COMPILE_IFELSE( |
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[AC_LANG_PROGRAM([[ |
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# define __EXTENSIONS__ 1 |
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]AC_INCLUDES_DEFAULT])], |
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[ac_cv_safe_to_define___extensions__=yes], |
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[ac_cv_safe_to_define___extensions__=no])]) |
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test $ac_cv_safe_to_define___extensions__ = yes && |
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AC_DEFINE([__EXTENSIONS__]) |
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AC_DEFINE([_ALL_SOURCE]) |
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AC_DEFINE([_GNU_SOURCE]) |
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AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) |
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AC_DEFINE([_TANDEM_SOURCE]) |
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])# AC_USE_SYSTEM_EXTENSIONS |
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# gl_USE_SYSTEM_EXTENSIONS |
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# ------------------------ |
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# Enable extensions on systems that normally disable them, |
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# typically due to standards-conformance issues. |
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AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS], |
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[ |
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dnl Require this macro before AC_USE_SYSTEM_EXTENSIONS. |
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dnl gnulib does not need it. But if it gets required by third-party macros |
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dnl after AC_USE_SYSTEM_EXTENSIONS is required, autoconf 2.62..2.63 emit a |
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dnl warning: "AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS". |
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dnl Note: We can do this only for one of the macros AC_AIX, AC_GNU_SOURCE, |
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dnl AC_MINIX. If people still use AC_AIX or AC_MINIX, they are out of luck. |
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AC_REQUIRE([AC_GNU_SOURCE]) |
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AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) |
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])
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