112 lines
3.2 KiB
Plaintext
112 lines
3.2 KiB
Plaintext
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# setenv.m4 serial 16
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dnl Copyright (C) 2001-2004, 2006-2010 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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if test $HAVE_SETENV$REPLACE_SETENV != 10; then
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AC_LIBOBJ([setenv])
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fi
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])
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# Like gl_FUNC_SETENV, except prepare for separate compilation (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_FUNCS_ONCE([setenv])
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if test $ac_cv_func_setenv = no; then
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HAVE_SETENV=0
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else
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AC_CACHE_CHECK([whether setenv validates arguments],
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[gl_cv_func_setenv_works],
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[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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]], [[
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if (setenv ("", "", 0) != -1) return 1;
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if (errno != EINVAL) return 2;
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if (setenv ("a", "=", 1) != 0) return 3;
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if (strcmp (getenv ("a"), "=") != 0) return 4;
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]])],
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[gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no],
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[gl_cv_func_setenv_works="guessing no"])])
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if test "$gl_cv_func_setenv_works" != yes; then
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REPLACE_SETENV=1
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AC_LIBOBJ([setenv])
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fi
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fi
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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_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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AC_LIBOBJ([unsetenv])
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gl_PREREQ_UNSETENV
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else
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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_TRY_COMPILE([#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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#if defined(__STDC__) || defined(__cplusplus)
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int unsetenv (const char *name);
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#else
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int unsetenv();
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#endif
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], , gt_cv_func_unsetenv_ret='int', gt_cv_func_unsetenv_ret='void')])
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if test $gt_cv_func_unsetenv_ret = 'void'; then
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AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void
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instead of int.])
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REPLACE_UNSETENV=1
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AC_LIBOBJ([unsetenv])
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fi
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dnl Solaris 10 unsetenv does not remove all copies of a name.
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AC_CACHE_CHECK([whether unsetenv works on duplicates],
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[gl_cv_func_unsetenv_works],
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[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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#include <stdlib.h>
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]], [[
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char entry[] = "b=2";
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if (putenv ((char *) "a=1")) return 1;
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if (putenv (entry)) return 2;
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entry[0] = 'a';
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unsetenv ("a");
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if (getenv ("a")) return 3;
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]])],
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[gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no],
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[gl_cv_func_unsetenv_works="guessing no"])])
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if test "$gl_cv_func_unsetenv_works" != yes; then
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REPLACE_UNSETENV=1
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AC_LIBOBJ([unsetenv])
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fi
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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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