| 1 | # putenv.m4 serial 25
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| 2 | dnl Copyright (C) 2002-2021 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_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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| 16 | AC_CACHE_CHECK([for putenv compatible with GNU and SVID],
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| 17 | [gl_cv_func_svid_putenv],
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| 18 | [AC_RUN_IFELSE(
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| 19 | [AC_LANG_PROGRAM(
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| 20 | [AC_INCLUDES_DEFAULT
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| 21 | GL_MDA_DEFINES],
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| 22 | [[
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| 23 | /* Put it in env. */
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| 24 | if (putenv ("CONFTEST_putenv=val"))
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| 25 | return 1;
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| 26 |
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| 27 | /* Try to remove it. */
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| 28 | if (putenv ("CONFTEST_putenv"))
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| 29 | return 2;
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| 30 |
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| 31 | /* Make sure it was deleted. */
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| 32 | if (getenv ("CONFTEST_putenv") != 0)
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| 33 | return 3;
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| 34 |
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| 35 | return 0;
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| 36 | ]])],
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| 37 | [gl_cv_func_svid_putenv=yes],
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| 38 | [gl_cv_func_svid_putenv=no],
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| 39 | [dnl When crosscompiling, assume putenv is broken.
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| 40 | case "$host_os" in
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| 41 | # Guess yes on glibc systems.
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| 42 | *-gnu* | gnu*) gl_cv_func_svid_putenv="guessing yes" ;;
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| 43 | # Guess yes on musl systems.
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| 44 | *-musl*) gl_cv_func_svid_putenv="guessing yes" ;;
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| 45 | # Guess no on native Windows.
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| 46 | mingw*) gl_cv_func_svid_putenv="guessing no" ;;
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| 47 | # If we don't know, obey --enable-cross-guesses.
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| 48 | *) gl_cv_func_svid_putenv="$gl_cross_guess_normal" ;;
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| 49 | esac
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| 50 | ])
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| 51 | ])
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| 52 | case "$gl_cv_func_svid_putenv" in
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| 53 | *yes) ;;
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| 54 | *)
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| 55 | REPLACE_PUTENV=1
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| 56 | ;;
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| 57 | esac
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| 58 | ])
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| 59 |
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| 60 | # Prerequisites of lib/putenv.c.
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| 61 | AC_DEFUN([gl_PREREQ_PUTENV],
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| 62 | [
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| 63 | AC_CHECK_DECLS([_putenv])
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| 64 | ])
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