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57 lines
1.6 KiB
Plaintext
57 lines
1.6 KiB
Plaintext
# putenv.m4 serial 20
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dnl Copyright (C) 2002-2015 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 "$host_os" in
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# Guess yes on glibc systems.
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*-gnu*) gl_cv_func_svid_putenv="guessing yes" ;;
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# If we don't know, assume the worst.
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*) gl_cv_func_svid_putenv="guessing no" ;;
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esac
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])
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])
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case "$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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