X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Flink-follow.m4;h=a3b07eb75922ee85d9d177e79e26b4dc68c08bcf;hb=98bf518eea602ba026803feae9a57977680a8e6d;hp=a57ab88a6e198e6bfee059c7d562caaed655f8b2;hpb=ca621fe9eb453d767216c8023eebe7ffe953d16d;p=gnulib.git

diff --git a/m4/link-follow.m4 b/m4/link-follow.m4
index a57ab88a6..a3b07eb75 100644
--- a/m4/link-follow.m4
+++ b/m4/link-follow.m4
@@ -1,13 +1,19 @@
-#serial 1
+#serial 2
 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,
 [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,
   [
-    # Create a regular file, `conftest.file'.
+    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(
       [
@@ -29,11 +35,11 @@ AC_DEFUN(jm_AC_FUNC_LINK_FOLLOWS_SYMLINK,
 	  const char *hard = "conftest.hard";
 	  struct stat sb_file, sb_hard;
 
-	  /* Create a symlink `conftest.sym' to it. */
+	  /* Create a symlink to the regular file. */
 	  if (symlink (file, sym))
 	    abort ();
 
-	  /* Create a hard link `conftest.hard' to that symlink.  */
+	  /* Create a hard link to that symlink.  */
 	  if (link (sym, hard))
 	    abort ();
 
@@ -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
 ])