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The comments at the top of llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn and llvm/utils/gn/build/write_cmake_config.py should explain the main bits happening in this patch. The main parts here are that these headers are generated at build time, not gn time, and that currently they don't do any actual feature checks but just hardcode most things based on the current OS, which seems to work well enough. If this stops being enough, the feature checks should each be their own action writing the result to somewhere, and the config write step should depend on those checks (so that they can run in parallel and as part of the build) -- utils/llvm/gn/README.rst already has some more words on that in "Philosophy". (write_cmake_config.py is also going to be used to write clang's clang/include/clang/Config/config.h) This also adds a few files for linking to system libraries in a consistent way if needed in llvm/utils/gn/build/libs (and moves pthread to that model).0 I'm also adding llvm/utils/gn/secondary/llvm/lib/Target/targets.gni in this patch because $native_arch is needed for writing llvm-config.h -- the rest of it will be used later, when the build files for llvm/lib/Target get added. That file describes how to select which archs to build. As a demo, also add a build file for llvm-undname and make it the default build target (it depends on everything that can currently be built). Differential Revision: https://reviews.llvm.org/D54678 llvm-svn: 347636
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