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This incorporates: 2019-03-23 Support cross-compilation to musl libc 2019-03-23 noreturn: In C++ mode with clang, use _Noreturn as fallback 2019-03-22 _Noreturn: beware of C's _Noreturn in C++ pre C++11 2019-03-19 Help making signal handlers more reliable 2019-03-18 _Noreturn: clang and MSVC do support [[noreturn]] in C++11 2019-03-17 _Noreturn: GCC 4.7 does not support [[noreturn]] in C++11 2019-03-14 all: Update URLs to msdn.microsoft.com * doc/misc/texinfo.tex, lib/_Noreturn.h, lib/gettimeofday.c: * lib/mktime.c, lib/regcomp.c, lib/regexec.c, lib/stat-time.h: * lib/utimens.c, m4/fdopendir.m4, m4/getgroups.m4: * m4/gettimeofday.m4, m4/gnulib-common.m4, m4/putenv.m4, m4/utimes.m4: Update from gnulib.
60 lines
1.9 KiB
Text
60 lines
1.9 KiB
Text
# putenv.m4 serial 23
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dnl Copyright (C) 2002-2019 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl From Jim Meyering.
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dnl
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dnl Check whether putenv ("FOO") removes FOO from the environment.
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dnl The putenv in libc on at least SunOS 4.1.4 does *not* do that.
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AC_DEFUN([gl_FUNC_PUTENV],
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[
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AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CACHE_CHECK([for putenv compatible with GNU and SVID],
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[gl_cv_func_svid_putenv],
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[AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],[[
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/* Put it in env. */
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if (putenv ("CONFTEST_putenv=val"))
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return 1;
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/* Try to remove it. */
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if (putenv ("CONFTEST_putenv"))
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return 2;
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/* Make sure it was deleted. */
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if (getenv ("CONFTEST_putenv") != 0)
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return 3;
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return 0;
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]])],
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gl_cv_func_svid_putenv=yes,
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gl_cv_func_svid_putenv=no,
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dnl When crosscompiling, assume putenv is broken.
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[case "$host_os" in
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# Guess yes on glibc systems.
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*-gnu* | gnu*) gl_cv_func_svid_putenv="guessing yes" ;;
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# Guess yes on musl systems.
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*-musl*) gl_cv_func_svid_putenv="guessing yes" ;;
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# Guess no on native Windows.
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mingw*) gl_cv_func_svid_putenv="guessing no" ;;
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# If we don't know, assume the worst.
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*) gl_cv_func_svid_putenv="guessing no" ;;
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esac
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])
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])
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case "$gl_cv_func_svid_putenv" in
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*yes) ;;
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*)
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REPLACE_PUTENV=1
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;;
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esac
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])
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# Prerequisites of lib/putenv.c.
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AC_DEFUN([gl_PREREQ_PUTENV],
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[
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AC_CHECK_DECLS([_putenv])
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])
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