[PATCH] [UBSan] Use shared library for UBSan on OS X (compiler-rt part).

[Anna Zaks]

I was able to build the makefile build with these changes.


================
Comment at: make/platform/clang_darwin.mk:242
@@ -229,6 +241,3 @@
 SHARED_LIBRARY.asan_iossim_dynamic := 1
-# configure+make uses Clang, so we're using isysroot instead of --sysroot
-# or -Wl,-syslibroot.
-LDFLAGS.asan_iossim_dynamic := -undefined dynamic_lookup -install_name @rpath/libclang_rt.asan_iossim_dynamic.dylib \
-  -Wl,-ios_simulator_version_min,7.0.0 \
-  -mios-simulator-version-min=7.0 -isysroot $(IOSSIM_SDK)
+LDFLAGS.asan_iossim_dynamic := $(SANITIZER_LDFLAGS) -install_name @rpath/libclang_rt.asan_iossim_dynamic.dylib \
+  -Wl,-ios_simulator_version_min,7.0.0 $(SANITIZER_IOSSIM_DEPLOYMENT_ARGS)
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I think we should pass -lc++ on all platforms to make sure we link against libc++.

http://reviews.llvm.org/D8473

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