Add makefile debugging target; use "make print-FOO" to print the
value/definition/origin of FOO.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65245 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Makefile.rules b/Makefile.rules
index 52a6110..06ffe00 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -1765,3 +1765,11 @@
$(Echo) "SubDirs : " '$(SubDirs)'
$(Echo) "ProjLibsPaths: " '$(ProjLibsPaths)'
$(Echo) "ProjLibsOptions: " '$(ProjLibsOptions)'
+
+###
+# Debugging
+
+# General debugging rule, use 'make print-XXX' to print the
+# definition, value and origin of XXX.
+print-%:
+ $(error PRINT: $(value $*) = "$($*)" (from $(origin $*)))