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3d458a81 | 1 | # putenv.m4 serial 18 |
f0007cad | 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 |
4 | dnl gives unlimited permission to copy and/or distribute it, | |
5 | dnl with or without modifications, as long as this notice is preserved. | |
6 | ||
7 | dnl From Jim Meyering. | |
8 | dnl | |
9 | dnl Check whether putenv ("FOO") removes FOO from the environment. | |
10 | dnl The putenv in libc on at least SunOS 4.1.4 does *not* do that. | |
11 | ||
12 | AC_DEFUN([gl_FUNC_PUTENV], | |
13 | [ | |
14 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) | |
15 | AC_CACHE_CHECK([for putenv compatible with GNU and SVID], | |
16 | [gl_cv_func_svid_putenv], | |
17 | [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],[[ | |
18 | /* Put it in env. */ | |
19 | if (putenv ("CONFTEST_putenv=val")) | |
20 | return 1; | |
21 | ||
22 | /* Try to remove it. */ | |
23 | if (putenv ("CONFTEST_putenv")) | |
0f00f2c3 | 24 | return 2; |
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25 | |
26 | /* Make sure it was deleted. */ | |
27 | if (getenv ("CONFTEST_putenv") != 0) | |
0f00f2c3 | 28 | return 3; |
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29 | |
30 | return 0; | |
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31 | ]])], |
32 | gl_cv_func_svid_putenv=yes, | |
33 | gl_cv_func_svid_putenv=no, | |
34 | dnl When crosscompiling, assume putenv is broken. | |
35 | gl_cv_func_svid_putenv=no) | |
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36 | ]) |
37 | if test $gl_cv_func_svid_putenv = no; then | |
38 | REPLACE_PUTENV=1 | |
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39 | fi |
40 | ]) |