If the source tree's Makefile is more up-to-date, copy it over into the build

tree.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9836 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/Makefile.rules b/Makefile.rules
index af0c021234afca1de8754afcd85bec72d540b86b..4702534f267949c617584caac6d3d6276226ba3a 100644 (file)
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -816,6 +816,12 @@ $(LLVM_OBJ_ROOT)/config.status:: $(LLVM_SRC_ROOT)/configure
        @${ECHO} "****************************************************************"
        $(VERB) exit 1
 
+# If the Makefile in the source tree has been updated, copy it over into the
+# build tree.
+Makefile :: $(BUILD_SRC_DIR)/Makefile
+       @${ECHO} "===== Makefile out of date, updating from source dir: `dirname $<` ====="
+       cp -f $< $@
+
 #
 # Include dependencies generated from C/C++ source files, but not if we
 # are cleaning (this example taken from the GNU Make Manual).