X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fsetenv.m4;h=7af13d724163c4e5a6ba4071365a929b5a496762;hb=6608ac42ed5557e8340a1f45679c619909b751a1;hp=3b19a2943a854571590208edc09d0a3ad3be9be3;hpb=7dd7a67c1fc5fbf657c2ffbd03c334310d368cb0;p=gnulib.git

diff --git a/m4/setenv.m4 b/m4/setenv.m4
index 3b19a2943..7af13d724 100644
--- a/m4/setenv.m4
+++ b/m4/setenv.m4
@@ -1,38 +1,55 @@
-# setenv.m4 serial 4
-dnl Copyright (C) 2001-2003 Free Software Foundation, Inc.
-dnl This file is free software, distributed under the terms of the GNU
-dnl General Public License.  As a special exception to the GNU General
-dnl Public License, this file may be distributed as part of a program
-dnl that contains a configuration script generated by Autoconf, under
-dnl the same distribution terms as the rest of that program.
+# setenv.m4 serial 10
+dnl Copyright (C) 2001-2004, 2006-2008 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
 
-AC_DEFUN([gt_FUNC_SETENV],
+AC_DEFUN([gl_FUNC_SETENV],
 [
-  AC_REPLACE_FUNCS(setenv unsetenv)
+  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+  AC_CHECK_FUNCS_ONCE([setenv])
   if test $ac_cv_func_setenv = no; then
+    HAVE_SETENV=0
+    AC_LIBOBJ([setenv])
     gl_PREREQ_SETENV
   fi
-  if test $ac_cv_func_unsetenv = no; then
-    gl_PREREQ_UNSETENV
+])
+
+# Like gl_FUNC_SETENV, except prepare for separate compilation (no AC_LIBOBJ).
+AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
+[
+  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+  AC_CHECK_FUNCS_ONCE([setenv])
+  if test $ac_cv_func_setenv = no; then
+    HAVE_SETENV=0
   fi
+  gl_PREREQ_SETENV
 ])
 
-# Check if a variable is properly declared.
-# gt_CHECK_VAR_DECL(includes,variable)
-AC_DEFUN([gt_CHECK_VAR_DECL],
+AC_DEFUN([gl_FUNC_UNSETENV],
 [
-  define([gt_cv_var], [gt_cv_var_]$2[_declaration])
-  AC_MSG_CHECKING([if $2 is properly declared])
-  AC_CACHE_VAL(gt_cv_var, [
-    AC_TRY_COMPILE([$1
-      extern struct { int foo; } $2;],
-      [$2.foo = 1;],
-      gt_cv_var=no,
-      gt_cv_var=yes)])
-  AC_MSG_RESULT($gt_cv_var)
-  if test $gt_cv_var = yes; then
-    AC_DEFINE([HAVE_]translit($2, [a-z], [A-Z])[_DECL], 1,
-              [Define if you have the declaration of $2.])
+  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+  AC_CHECK_FUNCS([unsetenv])
+  if test $ac_cv_func_unsetenv = no; then
+    HAVE_UNSETENV=0
+    AC_LIBOBJ([unsetenv])
+    gl_PREREQ_UNSETENV
+  else
+    AC_CACHE_CHECK([for unsetenv() return type], gt_cv_func_unsetenv_ret,
+      [AC_TRY_COMPILE([#include <stdlib.h>
+extern
+#ifdef __cplusplus
+"C"
+#endif
+#if defined(__STDC__) || defined(__cplusplus)
+int unsetenv (const char *name);
+#else
+int unsetenv();
+#endif
+], , gt_cv_func_unsetenv_ret='int', gt_cv_func_unsetenv_ret='void')])
+    if test $gt_cv_func_unsetenv_ret = 'void'; then
+      VOID_UNSETENV=1
+    fi
   fi
 ])
 
@@ -40,17 +57,15 @@ AC_DEFUN([gt_CHECK_VAR_DECL],
 AC_DEFUN([gl_PREREQ_SETENV],
 [
   AC_REQUIRE([AC_FUNC_ALLOCA])
+  AC_REQUIRE([gl_ENVIRON])
   AC_CHECK_HEADERS_ONCE(unistd.h)
   AC_CHECK_HEADERS(search.h)
   AC_CHECK_FUNCS(tsearch)
-  gt_CHECK_VAR_DECL([#include <errno.h>], errno)
-  gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
 ])
 
 # Prerequisites of lib/unsetenv.c.
 AC_DEFUN([gl_PREREQ_UNSETENV],
 [
+  AC_REQUIRE([gl_ENVIRON])
   AC_CHECK_HEADERS_ONCE(unistd.h)
-  gt_CHECK_VAR_DECL([#include <errno.h>], errno)
-  gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
 ])