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-rw-r--r--Driver/Makefile6
1 files changed, 6 insertions, 0 deletions
diff --git a/Driver/Makefile b/Driver/Makefile
index 22d7ffbfb5..d4b939052c 100644
--- a/Driver/Makefile
+++ b/Driver/Makefile
@@ -8,6 +8,12 @@ CXXFLAGS = -fno-rtti
# early so we can set up LINK_COMPONENTS before including Makefile.rules
include $(LEVEL)/Makefile.config
+# Optimize startup time of the app by not exporting all of the weak symbols
+# from the binary. This reduces dyld startup time by 4x.
+ifeq ($(OS),Darwin)
+LD.Flags += -Wl,-exported_symbol -Wl,_main
+endif
+
LINK_COMPONENTS := $(TARGETS_TO_BUILD) bitreader bitwriter codegen ipo selectiondag
USEDLIBS = clangCodeGen.a clangAnalysis.a clangRewrite.a clangSema.a \
clangDriver.a clangAST.a clangParse.a clangLex.a \