2007-06-06 18:12:30 +00:00
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# setenv.m4 serial 6
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dnl Copyright (C) 2001-2004, 2006 Free Software Foundation, Inc.
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2005-06-01 15:48:03 +00:00
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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([gt_FUNC_SETENV],
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[
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AC_REPLACE_FUNCS(setenv unsetenv)
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if test $ac_cv_func_setenv = no; then
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gl_PREREQ_SETENV
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fi
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if test $ac_cv_func_unsetenv = no; then
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gl_PREREQ_UNSETENV
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else
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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 if unsetenv() returns void, not int.])
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fi
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fi
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])
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# Check if a variable is properly declared.
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# gt_CHECK_VAR_DECL(includes,variable)
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AC_DEFUN([gt_CHECK_VAR_DECL],
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[
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define([gt_cv_var], [gt_cv_var_]$2[_declaration])
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AC_MSG_CHECKING([if $2 is properly declared])
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AC_CACHE_VAL(gt_cv_var, [
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AC_TRY_COMPILE([$1
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extern struct { int foo; } $2;],
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[$2.foo = 1;],
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gt_cv_var=no,
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gt_cv_var=yes)])
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AC_MSG_RESULT($gt_cv_var)
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if test $gt_cv_var = yes; then
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AC_DEFINE([HAVE_]translit($2, [a-z], [A-Z])[_DECL], 1,
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[Define if you have the declaration of $2.])
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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_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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gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
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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_CHECK_HEADERS_ONCE(unistd.h)
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gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
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])
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