X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Flink-follow.m4;h=6064ce74b4727ac17271cc1126f06a8ddb6c7f1c;hb=92b5babed0ef62fb044a2b9b7e331b743158c304;hp=18b6bff0dc573413cebff034483edb23884dc1ca;hpb=08d06501104ad014d583edc6b95a19dc347d6d3a;p=gnulib.git

diff --git a/m4/link-follow.m4 b/m4/link-follow.m4
index 18b6bff0d..6064ce74b 100644
--- a/m4/link-follow.m4
+++ b/m4/link-follow.m4
@@ -1,12 +1,18 @@
-#serial 1
+#serial 3
 dnl Run a program to determine whether whether link(2) follows symlinks.
 dnl Set LINK_FOLLOWS_SYMLINKS accordingly.
 
-AC_DEFUN(jm_AC_FUNC_LINK_FOLLOWS_SYMLINK,
+AC_DEFUN([jm_AC_FUNC_LINK_FOLLOWS_SYMLINK],
 [dnl
-  AC_CACHE_CHECK([whether link(2) follows symlinks],
+  AC_CACHE_CHECK(
+    [whether link(2) dereferences a symlink specified with a trailing slash],
 		 jm_ac_cv_func_link_follows_symlink,
   [
+    dnl poor-man's AC_REQUIRE: FIXME: repair this once autoconf-3 provides
+    dnl the appropriate framework.
+    test -z "$ac_cv_header_unistd_h" \
+      && AC_CHECK_HEADERS(unistd.h)
+
     # Create a regular file.
     echo > conftest.file
     AC_TRY_RUN(
@@ -49,7 +55,11 @@ AC_DEFUN(jm_AC_FUNC_LINK_FOLLOWS_SYMLINK,
       ],
       jm_ac_cv_func_link_follows_symlink=yes,
       jm_ac_cv_func_link_follows_symlink=no,
-      jm_ac_cv_func_link_follows_symlink=yes, We're cross compiling.
+      jm_ac_cv_func_link_follows_symlink=yes dnl We're cross compiling.
     )
   ])
+  if test $jm_ac_cv_func_link_follows_symlink = yes; then
+    AC_DEFINE(LINK_FOLLOWS_SYMLINKS, 1,
+      [Define if `link(2)' dereferences symbolic links.])
+  fi
 ])