smeenai added inline comments.

================
Comment at: cmake/config-ix.cmake:18
@@ +17,3 @@
+if (LIBCXX_SUPPORTS_NODEFAULTLIBS_FLAG)
+  list(APPEND CMAKE_REQUIRED_LIBRARIES -nodefaultlibs)
+  if (LIBCXX_HAS_C_LIB)
----------------
compnerd wrote:
> Can we not use `CMAKE_SHARED_LINKER_FLAGS` instead of 
> `CMAKE_REQUIRED_LIBRARIES`?  It is slightly misleading.
That would pollute everything building a shared library, whereas this limits it 
to only configuration checks. I know it's misleading, but I view it similar to 
how `target_link_libraries` is also used for specifying linker flags.

Speaking of pollution though, my `REQUIRED_*` changes in this file will end up 
affecting other projects for non-standalone builds, correct? What's the best 
way to limit this to be libc++-only?


https://reviews.llvm.org/D23856



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