Index: source/Utility/Makefile
===================================================================
--- source/Utility/Makefile	(revision 169766)
+++ source/Utility/Makefile	(revision 169767)
@@ -12,4 +12,11 @@
 BUILD_ARCHIVE = 1
 NO_PEDANTIC = 1
 
+# Enable RTTI on GCC builds because liblldbCore.a requires RTTI.
+# See source/Core/Makefile for details.
+ifeq (g++,$(shell basename $(CXX)))
+  REQUIRES_RTTI = 1
+endif
+
+
 include $(LLDB_LEVEL)/Makefile
Index: source/Core/Makefile
===================================================================
--- source/Core/Makefile	(revision 169766)
+++ source/Core/Makefile	(revision 169767)
@@ -11,4 +11,15 @@
 LIBRARYNAME := lldbCore
 BUILD_ARCHIVE = 1
 
+# Enable RTTI on GCC builds because one source file in this directory
+# (cxa_demangle.cpp) uses dynamic_cast<> and GCC (at least 4.6 and 4.7)
+# complain if we try to compile it with -fno-rtti. This is somewhat of a
+# kludge because it forces us to enable RTTI in liblldbUtility.a and also
+# link in additional clang static libraries to resolve vtable references,
+# but actually has negligible impact on (shard object) file size.
+$(info shell basename CXX is $(shell basename $(CXX)))
+ifeq (g++,$(shell basename $(CXX)))
+  REQUIRES_RTTI = 1
+endif
+
 include $(LLDB_LEVEL)/Makefile
Index: lib/Makefile
===================================================================
--- lib/Makefile	(revision 169766)
+++ lib/Makefile	(revision 169767)
@@ -67,6 +67,14 @@
 	lldbPluginPlatformLinux.a \
 	lldbPluginPlatformFreeBSD.a
 
+# Because GCC requires RTTI enabled for lldbCore (see source/Core/Makefile) it is
+# necessary to also link the clang rewriter libraries so vtable references can
+# be resolved correctly, if we are building with GCC.
+ifeq (g++,$(shell basename $(CXX)))
+  USEDLIBS += clangRewriteCore.a \
+              clangRewriteFrontend.a
+endif
+
 include $(LLDB_LEVEL)/../../Makefile.config
 
 LINK_COMPONENTS := $(TARGETS_TO_BUILD) asmparser bitreader bitwriter codegen \