X-Git-Url: https://git.cworth.org/git?p=tar;a=blobdiff_plain;f=m4%2Fsetenv.m4;fp=m4%2Fsetenv.m4;h=de7171ee5226dc8d2557bc487a863926f3f2c99f;hp=ae4dd863fc4574401dd4e22b5c3c9a585fd37dbb;hb=b414e25de8ca49d7567a92c203d431383ec57c83;hpb=29ece34f44a27750bbfd76154ad9882580453dc7

diff --git a/m4/setenv.m4 b/m4/setenv.m4
index ae4dd86..de7171e 100644
--- a/m4/setenv.m4
+++ b/m4/setenv.m4
@@ -1,4 +1,4 @@
-# setenv.m4 serial 15
+# setenv.m4 serial 18
 dnl Copyright (C) 2001-2004, 2006-2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -25,6 +25,7 @@ AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
       [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
        #include <stdlib.h>
        #include <errno.h>
+       #include <string.h>
       ]], [[
        if (setenv ("", "", 0) != -1) return 1;
        if (errno != EINVAL) return 2;
@@ -52,7 +53,10 @@ AC_DEFUN([gl_FUNC_UNSETENV],
   else
     dnl Some BSDs return void, failing to do error checking.
     AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret],
-      [AC_TRY_COMPILE([#include <stdlib.h>
+      [AC_COMPILE_IFELSE(
+         [AC_LANG_PROGRAM(
+            [[
+#include <stdlib.h>
 extern
 #ifdef __cplusplus
 "C"
@@ -62,7 +66,10 @@ int unsetenv (const char *name);
 #else
 int unsetenv();
 #endif
-], , gt_cv_func_unsetenv_ret='int', gt_cv_func_unsetenv_ret='void')])
+            ]],
+            [[]])],
+         [gt_cv_func_unsetenv_ret='int'],
+         [gt_cv_func_unsetenv_ret='void'])])
     if test $gt_cv_func_unsetenv_ret = 'void'; then
       AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void
        instead of int.])
@@ -71,10 +78,12 @@ int unsetenv();
     fi
 
     dnl Solaris 10 unsetenv does not remove all copies of a name.
-    AC_CACHE_CHECK([whether unsetenv works on duplicates],
+    dnl OpenBSD 4.7 unsetenv("") does not fail.
+    AC_CACHE_CHECK([whether unsetenv obeys POSIX],
       [gl_cv_func_unsetenv_works],
       [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
        #include <stdlib.h>
+       #include <errno.h>
       ]], [[
        char entry[] = "b=2";
        if (putenv ((char *) "a=1")) return 1;
@@ -82,6 +91,7 @@ int unsetenv();
        entry[0] = 'a';
        unsetenv ("a");
        if (getenv ("a")) return 3;
+       if (!unsetenv ("") || errno != EINVAL) return 4;
       ]])],
       [gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no],
       [gl_cv_func_unsetenv_works="guessing no"])])