.

[gnulib.git] / m4 / link-follow.m4

diff --git a/m4/link-follow.m4 b/m4/link-follow.m4
index 18b6bff..a3b07eb 100644 (file)
--- a/m4/link-follow.m4
+++ b/m4/link-follow.m4
@@ -1,12 +1,18 @@
-#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,
   [
+    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
 ])