8e2855ce0b
Summary: Currently we have 5 variables that are used to specify options for building libcxx 1. `LIBCXX_CXX_FEATURE_FLAGS` 2. `LIBCXX_CXX_WARNING_FLAGS` 3. `LIBCXX_CXX_REQUIRED_FLAGS` 4. `compile_flags` (in libcxx/lib) 5. `link_flags` (in libcxx/lib) The first three all get put into `CMAKE_CXX_FLAGS`. This changes the way flags are handled by only using 3 different options: 1. `LIBCXX_CXX_FLAGS` - general compile and link flags. 2. `LIBCXX_COMPILE_FLAGS` - compile only flags. 3. `LIBCXX_LINK_FLAGS` - link only flags. This patch also removes the warning about `-nostdinc++` being unused during linking. Reviewers: mclow.lists, danalbert Reviewed By: danalbert Subscribers: cfe-commits Differential Revision: http://reviews.llvm.org/D6277 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@222080 91177308-0d34-0410-b5e6-96231b3b80d8