hermes-windows/external/CMakeLists.txt

add_subdirectory(dtoa)
add_subdirectory(zip)
# Do not include llvh - it will be included directly.
# add_subdirectory(llvh)
Initial commit fbshipit-source-id: 75e378602933ab4aa91677dfa509a67063e64516 2019-07-10 19:43:32 +03:00			`add_subdirectory(dtoa)`
			`add_subdirectory(zip)`
Use internal fork of LLVM Summary: Place a fork of LLVM git rev c179d7b006348005d2da228aed4c3c251590baa3 under `external/llvh`(1) and modify the CMake build to use it. I am calling it a "fork", because it is not all of LLVM. Only the parts that are used by Hermes are included, which at this time is only parts of `libLLVMSupporrt`. Most(2) of LLVM build scripts are removed, and it is treated just as another ordinary library. (1) Why `llvh`? To be able to coexist with instances of the "real" LLVM, we must change the namespace, all public symbols containing the `llvm` string and the include directory name. `llvh` seemed as good a name as any. I also considered `llvm-h` and `h-llvm`, but the problem is that they are a superstring of `llvm` so it becomes harder to search for the `llvm` string. Note that the actual rename will happen in a follow up diff. It would be a massive patch. (2) libLLVMSupport relies on pretty elaborate feature detection scripts, which would be painful to duplicate, so for now I have preserved them under external/llvh/cmake. Unfortunately turning LLVM into an ordinary library is not enough, since we were implicitly relying on a lot of functionality provided by the LLVM build scripts. Things like setting default warning flags, easily turning exceptions on and off, etc. I attempted to replace it with Hermes equivalents, which are now provided by `cmake/Hermes.cmake`: - `add_llvm_library/tool()` is replaced by `add_hermes_library/tool()`. - Several `LLVM_xxx` variables are replaced my similar `HERMES_xxx` ones. As a result, building Hermes now requires only checking it out, and running CMake and Ninja. It is a vastly simpler process than before. == Limitations - CMake LTO and ASAN builds aren't supported yet. - The JIT requires the "real" LLVM for disassembly. Reviewed By: avp Differential Revision: D19658656 fbshipit-source-id: 5094d2af45e343973b1aab02c550a18b2bf93a06 2020-02-06 11:30:00 +03:00			`# Do not include llvh - it will be included directly.`
			`# add_subdirectory(llvh)`