| # serial 15 -*- Autoconf -*- |
| # Enable extensions on systems that normally disable them. |
| |
| # Copyright (C) 2003, 2006-2016 Free Software Foundation, Inc. |
| # This file is free software; the Free Software Foundation |
| # gives unlimited permission to copy and/or distribute it, |
| # with or without modifications, as long as this notice is preserved. |
| |
| # This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from git |
| # Autoconf. Perhaps we can remove this once we can assume Autoconf |
| # 2.70 or later everywhere, but since Autoconf mutates rapidly |
| # enough in this area it's likely we'll need to redefine |
| # AC_USE_SYSTEM_EXTENSIONS for quite some time. |
| |
| # If autoconf reports a warning |
| # warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS |
| # or warning: AC_RUN_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS |
| # the fix is |
| # 1) to ensure that AC_USE_SYSTEM_EXTENSIONS is never directly invoked |
| # but always AC_REQUIREd, |
| # 2) to ensure that for each occurrence of |
| # AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) |
| # or |
| # AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) |
| # the corresponding gnulib module description has 'extensions' among |
| # its dependencies. This will ensure that the gl_USE_SYSTEM_EXTENSIONS |
| # invocation occurs in gl_EARLY, not in gl_INIT. |
| |
| # AC_USE_SYSTEM_EXTENSIONS |
| # ------------------------ |
| # Enable extensions on systems that normally disable them, |
| # typically due to standards-conformance issues. |
| # |
| # Remember that #undef in AH_VERBATIM gets replaced with #define by |
| # AC_DEFINE. The goal here is to define all known feature-enabling |
| # macros, then, if reports of conflicts are made, disable macros that |
| # cause problems on some platforms (such as __EXTENSIONS__). |
| AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS], |
| [AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl |
| AC_BEFORE([$0], [AC_RUN_IFELSE])dnl |
| |
| AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=]) |
| if test "$MINIX" = yes; then |
| AC_DEFINE([_POSIX_SOURCE], [1], |
| [Define to 1 if you need to in order for 'stat' and other |
| things to work.]) |
| AC_DEFINE([_POSIX_1_SOURCE], [2], |
| [Define to 2 if the system does not provide POSIX.1 features |
| except with this defined.]) |
| AC_DEFINE([_MINIX], [1], |
| [Define to 1 if on MINIX.]) |
| AC_DEFINE([_NETBSD_SOURCE], [1], |
| [Define to 1 to make NetBSD features available. MINIX 3 needs this.]) |
| fi |
| |
| dnl Use a different key than __EXTENSIONS__, as that name broke existing |
| dnl configure.ac when using autoheader 2.62. |
| AH_VERBATIM([USE_SYSTEM_EXTENSIONS], |
| [/* Enable extensions on AIX 3, Interix. */ |
| #ifndef _ALL_SOURCE |
| # undef _ALL_SOURCE |
| #endif |
| /* Enable general extensions on macOS. */ |
| #ifndef _DARWIN_C_SOURCE |
| # undef _DARWIN_C_SOURCE |
| #endif |
| /* Enable GNU extensions on systems that have them. */ |
| #ifndef _GNU_SOURCE |
| # undef _GNU_SOURCE |
| #endif |
| /* Enable threading extensions on Solaris. */ |
| #ifndef _POSIX_PTHREAD_SEMANTICS |
| # undef _POSIX_PTHREAD_SEMANTICS |
| #endif |
| /* Enable extensions specified by ISO/IEC TS 18661-5:2014. */ |
| #ifndef __STDC_WANT_IEC_60559_ATTRIBS_EXT__ |
| # undef __STDC_WANT_IEC_60559_ATTRIBS_EXT__ |
| #endif |
| /* Enable extensions specified by ISO/IEC TS 18661-1:2014. */ |
| #ifndef __STDC_WANT_IEC_60559_BFP_EXT__ |
| # undef __STDC_WANT_IEC_60559_BFP_EXT__ |
| #endif |
| /* Enable extensions specified by ISO/IEC TS 18661-2:2015. */ |
| #ifndef __STDC_WANT_IEC_60559_DFP_EXT__ |
| # undef __STDC_WANT_IEC_60559_DFP_EXT__ |
| #endif |
| /* Enable extensions specified by ISO/IEC TS 18661-4:2015. */ |
| #ifndef __STDC_WANT_IEC_60559_FUNCS_EXT__ |
| # undef __STDC_WANT_IEC_60559_FUNCS_EXT__ |
| #endif |
| /* Enable extensions specified by ISO/IEC TS 18661-3:2015. */ |
| #ifndef __STDC_WANT_IEC_60559_TYPES_EXT__ |
| # undef __STDC_WANT_IEC_60559_TYPES_EXT__ |
| #endif |
| /* Enable extensions specified by ISO/IEC TR 24731-2:2010. */ |
| #ifndef __STDC_WANT_LIB_EXT2__ |
| # undef __STDC_WANT_LIB_EXT2__ |
| #endif |
| /* Enable extensions specified by ISO/IEC 24747:2009. */ |
| #ifndef __STDC_WANT_MATH_SPEC_FUNCS__ |
| # undef __STDC_WANT_MATH_SPEC_FUNCS__ |
| #endif |
| /* Enable extensions on HP NonStop. */ |
| #ifndef _TANDEM_SOURCE |
| # undef _TANDEM_SOURCE |
| #endif |
| /* Enable X/Open extensions if necessary. HP-UX 11.11 defines |
| mbstate_t only if _XOPEN_SOURCE is defined to 500, regardless of |
| whether compiling with -Ae or -D_HPUX_SOURCE=1. */ |
| #ifndef _XOPEN_SOURCE |
| # undef _XOPEN_SOURCE |
| #endif |
| /* Enable general extensions on Solaris. */ |
| #ifndef __EXTENSIONS__ |
| # undef __EXTENSIONS__ |
| #endif |
| ]) |
| AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], |
| [ac_cv_safe_to_define___extensions__], |
| [AC_COMPILE_IFELSE( |
| [AC_LANG_PROGRAM([[ |
| # define __EXTENSIONS__ 1 |
| ]AC_INCLUDES_DEFAULT])], |
| [ac_cv_safe_to_define___extensions__=yes], |
| [ac_cv_safe_to_define___extensions__=no])]) |
| test $ac_cv_safe_to_define___extensions__ = yes && |
| AC_DEFINE([__EXTENSIONS__]) |
| AC_DEFINE([_ALL_SOURCE]) |
| AC_DEFINE([_DARWIN_C_SOURCE]) |
| AC_DEFINE([_GNU_SOURCE]) |
| AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) |
| AC_DEFINE([__STDC_WANT_IEC_60559_ATTRIBS_EXT__]) |
| AC_DEFINE([__STDC_WANT_IEC_60559_BFP_EXT__]) |
| AC_DEFINE([__STDC_WANT_IEC_60559_DFP_EXT__]) |
| AC_DEFINE([__STDC_WANT_IEC_60559_FUNCS_EXT__]) |
| AC_DEFINE([__STDC_WANT_IEC_60559_TYPES_EXT__]) |
| AC_DEFINE([__STDC_WANT_LIB_EXT2__]) |
| AC_DEFINE([__STDC_WANT_MATH_SPEC_FUNCS__]) |
| AC_DEFINE([_TANDEM_SOURCE]) |
| AC_CACHE_CHECK([whether _XOPEN_SOURCE should be defined], |
| [ac_cv_should_define__xopen_source], |
| [ac_cv_should_define__xopen_source=no |
| AC_COMPILE_IFELSE( |
| [AC_LANG_PROGRAM([[ |
| #include <wchar.h> |
| mbstate_t x;]])], |
| [], |
| [AC_COMPILE_IFELSE( |
| [AC_LANG_PROGRAM([[ |
| #define _XOPEN_SOURCE 500 |
| #include <wchar.h> |
| mbstate_t x;]])], |
| [ac_cv_should_define__xopen_source=yes])])]) |
| test $ac_cv_should_define__xopen_source = yes && |
| AC_DEFINE([_XOPEN_SOURCE], [500]) |
| ])# AC_USE_SYSTEM_EXTENSIONS |
| |
| # gl_USE_SYSTEM_EXTENSIONS |
| # ------------------------ |
| # Enable extensions on systems that normally disable them, |
| # typically due to standards-conformance issues. |
| AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS], |
| [ |
| dnl Require this macro before AC_USE_SYSTEM_EXTENSIONS. |
| dnl gnulib does not need it. But if it gets required by third-party macros |
| dnl after AC_USE_SYSTEM_EXTENSIONS is required, autoconf 2.62..2.63 emit a |
| dnl warning: "AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS". |
| dnl Note: We can do this only for one of the macros AC_AIX, AC_GNU_SOURCE, |
| dnl AC_MINIX. If people still use AC_AIX or AC_MINIX, they are out of luck. |
| AC_REQUIRE([AC_GNU_SOURCE]) |
| |
| AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) |
| ]) |