From e5ab51d51f6e5cebf57db76c7f8527febc6a2b71 Mon Sep 17 00:00:00 2001
From: NAKAMURA Takumi <geek4civic@gmail.com>
Date: Sun, 16 Oct 2011 02:54:26 +0000
Subject: autoconf: Introduce --with-clang-srcdir, to build out-of-tree clang
 as tools/clang on tools/Makefile.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142102 91177308-0d34-0410-b5e6-96231b3b80d8
---
 autoconf/configure.ac | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'autoconf')

diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index 128dd7f978..b8b61bc16b 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -795,6 +795,17 @@ case "$withval" in
   *) AC_MSG_ERROR([Invalid path for --with-ocaml-libdir. Provide full path]) ;;
 esac
 
+AC_ARG_WITH(clang-srcdir,
+  AS_HELP_STRING([--with-clang-srcdir],
+    [Directory to the out-of-tree Clang source]),,
+    withval="-")
+case "$withval" in
+  -) clang_src_root="" ;;
+  /* | [[A-Za-z]]:[[\\/]]*) clang_src_root="$withval" ;;
+  *) clang_src_root="$ac_pwd/$withval" ;;
+esac
+AC_SUBST(CLANG_SRC_ROOT,[$clang_src_root])
+
 AC_ARG_WITH(clang-resource-dir,
   AS_HELP_STRING([--with-clang-resource-dir],
     [Relative directory from the Clang binary for resource files]),,
-- 
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