autoconf: fix build/src dir confusion

This was the cause of the silent failure to generate
clang's config.h. My bad.

Fix on r149563 / r149568.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149574 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index c9757d9ff7b7f6cbcd89f66e0874375a7ccdd528..6316be9c5271a238fd653ab590ca9046af916078 100644 (file)
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -1589,7 +1589,7 @@ AC_CONFIG_FILES([docs/doxygen.cfg])
 
 dnl Configure clang, if present
 if test ${clang_src_root} = ""; then
-  clang_src_root="$ac_pwd/tools/clang"
+  clang_src_root="$srcdir/tools/clang"
 fi
 if test -f ${clang_src_root}/README.txt; then
   AC_CONFIG_HEADERS([${clang_src_root}/include/clang/Config/config.h])