167 lines
4.9 KiB
Plaintext
167 lines
4.9 KiB
Plaintext
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# setenv.m4 serial 30
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dnl Copyright (C) 2001-2004, 2006-2022 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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AC_DEFUN([gl_FUNC_SETENV],
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[
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AC_REQUIRE([gl_FUNC_SETENV_SEPARATE])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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if test $ac_cv_func_setenv = no; then
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HAVE_SETENV=0
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else
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AC_CACHE_CHECK([whether setenv validates arguments],
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[gl_cv_func_setenv_works],
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[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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]], [[
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int result = 0;
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{
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if (setenv ("", "", 0) != -1)
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result |= 1;
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else if (errno != EINVAL)
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result |= 2;
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}
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{
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if (setenv ("a", "=", 1) != 0)
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result |= 4;
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else if (strcmp (getenv ("a"), "=") != 0)
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result |= 8;
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}
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return result;
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]])],
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[gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no],
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[case "$host_os" in
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# Guess yes on glibc systems.
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*-gnu* | gnu*) gl_cv_func_setenv_works="guessing yes" ;;
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# Guess yes on musl systems.
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*-musl*) gl_cv_func_setenv_works="guessing yes" ;;
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# If we don't know, obey --enable-cross-guesses.
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*) gl_cv_func_setenv_works="$gl_cross_guess_normal" ;;
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esac
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])])
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case "$gl_cv_func_setenv_works" in
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*yes) ;;
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*)
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REPLACE_SETENV=1
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;;
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esac
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fi
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])
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# Like gl_FUNC_SETENV, except prepare for separate compilation
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# (no REPLACE_SETENV, no AC_LIBOBJ).
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AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
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[
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AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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AC_CHECK_DECLS_ONCE([setenv])
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if test $ac_cv_have_decl_setenv = no; then
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HAVE_DECL_SETENV=0
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fi
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AC_CHECK_FUNCS_ONCE([setenv])
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gl_PREREQ_SETENV
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])
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AC_DEFUN([gl_FUNC_UNSETENV],
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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_CHECK_DECLS_ONCE([unsetenv])
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if test $ac_cv_have_decl_unsetenv = no; then
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HAVE_DECL_UNSETENV=0
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fi
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AC_CHECK_FUNCS([unsetenv])
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if test $ac_cv_func_unsetenv = no; then
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HAVE_UNSETENV=0
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else
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HAVE_UNSETENV=1
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dnl Some BSDs return void, failing to do error checking.
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AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[
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#undef _BSD
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#define _BSD 1 /* unhide unsetenv declaration in OSF/1 5.1 <stdlib.h> */
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#include <stdlib.h>
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extern
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#ifdef __cplusplus
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"C"
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#endif
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int unsetenv (const char *name);
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]],
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[[]])],
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[gt_cv_func_unsetenv_ret='int'],
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[gt_cv_func_unsetenv_ret='void'])])
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if test $gt_cv_func_unsetenv_ret = 'void'; then
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AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void
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instead of int.])
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REPLACE_UNSETENV=1
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fi
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dnl Solaris 10 unsetenv does not remove all copies of a name.
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dnl Haiku alpha 2 unsetenv gets confused by assignment to environ.
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dnl OpenBSD 4.7 unsetenv("") does not fail.
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AC_CACHE_CHECK([whether unsetenv obeys POSIX],
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[gl_cv_func_unsetenv_works],
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM([[
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#include <stdlib.h>
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#include <errno.h>
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extern char **environ;
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]GL_MDA_DEFINES],
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[[
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char entry1[] = "a=1";
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char entry2[] = "b=2";
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char *env[] = { entry1, entry2, NULL };
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if (putenv ((char *) "a=1")) return 1;
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if (putenv (entry2)) return 2;
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entry2[0] = 'a';
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unsetenv ("a");
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if (getenv ("a")) return 3;
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if (!unsetenv ("") || errno != EINVAL) return 4;
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entry2[0] = 'b';
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environ = env;
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if (!getenv ("a")) return 5;
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entry2[0] = 'a';
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unsetenv ("a");
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if (getenv ("a")) return 6;
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]])],
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[gl_cv_func_unsetenv_works=yes],
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[gl_cv_func_unsetenv_works=no],
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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_unsetenv_works="guessing yes" ;;
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# If we don't know, obey --enable-cross-guesses.
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*) gl_cv_func_unsetenv_works="$gl_cross_guess_normal" ;;
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esac
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])
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])
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case "$gl_cv_func_unsetenv_works" in
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*yes) ;;
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*)
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REPLACE_UNSETENV=1
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;;
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esac
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fi
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])
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# Prerequisites of lib/setenv.c.
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AC_DEFUN([gl_PREREQ_SETENV],
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[
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AC_REQUIRE([AC_FUNC_ALLOCA])
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AC_REQUIRE([gl_ENVIRON])
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AC_CHECK_HEADERS_ONCE([unistd.h])
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AC_CHECK_HEADERS([search.h])
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AC_CHECK_FUNCS([tsearch])
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])
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# Prerequisites of lib/unsetenv.c.
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AC_DEFUN([gl_PREREQ_UNSETENV],
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[
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AC_REQUIRE([gl_ENVIRON])
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AC_CHECK_HEADERS_ONCE([unistd.h])
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])
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