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Last change
on this file since 3532 was 2595, checked in by bird, 13 years ago |
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gnu grep version 2.12 (grep-2.12.tar.xz, md5sum=8d2f0346d08b13c18afb81f0e8aa1e2f)
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| 1 | # putenv.m4 serial 18
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| 2 | dnl Copyright (C) 2002-2012 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl From Jim Meyering.
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| 8 | dnl
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| 9 | dnl Check whether putenv ("FOO") removes FOO from the environment.
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| 10 | dnl The putenv in libc on at least SunOS 4.1.4 does *not* do that.
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| 11 |
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| 12 | AC_DEFUN([gl_FUNC_PUTENV],
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| 13 | [
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| 14 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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| 15 | AC_CACHE_CHECK([for putenv compatible with GNU and SVID],
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| 16 | [gl_cv_func_svid_putenv],
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| 17 | [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],[[
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| 18 | /* Put it in env. */
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| 19 | if (putenv ("CONFTEST_putenv=val"))
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| 20 | return 1;
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| 21 |
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| 22 | /* Try to remove it. */
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| 23 | if (putenv ("CONFTEST_putenv"))
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| 24 | return 2;
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| 25 |
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| 26 | /* Make sure it was deleted. */
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| 27 | if (getenv ("CONFTEST_putenv") != 0)
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| 28 | return 3;
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| 29 |
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| 30 | return 0;
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| 31 | ]])],
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| 32 | gl_cv_func_svid_putenv=yes,
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| 33 | gl_cv_func_svid_putenv=no,
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| 34 | dnl When crosscompiling, assume putenv is broken.
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| 35 | gl_cv_func_svid_putenv=no)
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| 36 | ])
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| 37 | if test $gl_cv_func_svid_putenv = no; then
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| 38 | REPLACE_PUTENV=1
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| 39 | fi
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| 40 | ])
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