X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=m4%2Flink.m4;h=7cc0ceb91c698bbf169f506c89ead995cff97ebb;hb=e4faf46844fa3162def723f12a09791e350caabb;hp=0ca85d3a8bed25fa4c2bf6133b1ba5dca59f7255;hpb=de7372b23c3da92fbfaea2d1ac592f0b2ba87914;p=debian%2Ftar

diff --git a/m4/link.m4 b/m4/link.m4
index 0ca85d3a..7cc0ceb9 100644
--- a/m4/link.m4
+++ b/m4/link.m4
@@ -1,5 +1,5 @@
-# link.m4 serial 4
-dnl Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+# link.m4 serial 8
+dnl Copyright (C) 2009-2013 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.
@@ -7,12 +7,12 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_LINK],
 [
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   AC_CHECK_FUNCS_ONCE([link])
   if test $ac_cv_func_link = no; then
     HAVE_LINK=0
-    AC_LIBOBJ([link])
   else
-    AC_CACHE_CHECK([whether link handles trailing slash correctly],
+    AC_CACHE_CHECK([whether link obeys POSIX],
       [gl_cv_func_link_works],
       [touch conftest.a
        # Assume that if we have lstat, we can also check symlinks.
@@ -22,17 +22,34 @@ AC_DEFUN([gl_FUNC_LINK],
        AC_RUN_IFELSE(
          [AC_LANG_PROGRAM(
            [[#include <unistd.h>
-]], [[if (!link ("conftest.a", "conftest.b/")) return 1;
+           ]],
+           [[int result = 0;
+             if (!link ("conftest.a", "conftest.b/"))
+               result |= 1;
 #if HAVE_LSTAT
-      if (!link ("conftest.lnk/", "conftest.b")) return 2;
+             if (!link ("conftest.lnk/", "conftest.b"))
+               result |= 2;
+             if (rename ("conftest.a", "conftest.b"))
+               result |= 4;
+             if (!link ("conftest.b", "conftest.lnk"))
+               result |= 8;
 #endif
+             return result;
            ]])],
          [gl_cv_func_link_works=yes], [gl_cv_func_link_works=no],
-         [gl_cv_func_link_works="guessing no"])
+         [case "$host_os" in
+                    # Guess yes on glibc systems.
+            *-gnu*) gl_cv_func_link_works="guessing yes" ;;
+                    # If we don't know, assume the worst.
+            *)      gl_cv_func_link_works="guessing no" ;;
+          esac
+         ])
        rm -f conftest.a conftest.b conftest.lnk])
-    if test "$gl_cv_func_link_works" != yes; then
-      REPLACE_LINK=1
-      AC_LIBOBJ([link])
-    fi
+    case "$gl_cv_func_link_works" in
+      *yes) ;;
+      *)
+        REPLACE_LINK=1
+        ;;
+    esac
   fi
 ])