hintonda updated this revision to Diff 130367. hintonda added a comment. Refactor to eliminate need for second stage and toolchain files.
Repository: rC Clang https://reviews.llvm.org/D41829 Files: cmake/caches/Linux.cmake
Index: cmake/caches/Linux.cmake =================================================================== --- /dev/null +++ cmake/caches/Linux.cmake @@ -0,0 +1,130 @@ +# This file is primarily for cross compiling clang+llvm, et al, for +# Linux on Darwin, and can be invoked like this: +# +# cmake -GNinja -DBOOTSTRAP_CMAKE_SYSROOT=<sysroot path> [OPTIONS] \ +# -C <clang root>/cmake/caches/Linux.cmake ../llvm +# +# Known issues: +# +# 1) This toolchain assumes a flat, mono-repo layout. +# +# 2) Several sub-projects, including libcxx, libcxxabi, and +# libunwind, use find_path() to find the source path for headers +# in the source directories of other sub-projects on the host +# system, but fail because they don't specify +# NO_CMAKE_FIND_ROOT_PATH. The following patches are reqired to +# build these projects: +# +# Patch: libcxx https://reviews.llvm.org/D41622 +# libcxxabi https://reviews.llvm.org/D41623 +# libunwind https://reviews.llvm.org/D41621 +# +# Workaround: None +# +# 3) Stage2 configuration fails for several sub-projects which don't +# explicitly handle rpath correctly, including compiler-rt, +# libcxx, libcxxabi, and libunwind. LLVM handles this in the +# llvm_setup_rpath() function in AddLLVM.cmake. +# +# Patch: TBD +# +# Workaround: pass -DBOOTSTRAP_CMAKE_BUILD_WITH_INSTALL_RPATH=ON +# +# 4) To link elf binaries on Darwin, it's necessary to pass +# CLANG_DEFAULT_LINKER=lld when building the compiler used in +# stage2. Unfortunately, ld64.lld does not yet handle several +# arguments sent by clang, causing Native tool configuration to +# fail. In order to prevent this, it is necessary to pass +# CLANG_TABLEGEN, LLVM_TABLEGEN, and LLVM_CONFIG_EXE. +# +# Patch: https://reviews.llvm.org/D41806 +# +# Workaround: None +# +# 5) If CMAKE_ASM_COMPILER is set, cmake assumes +# CMAKE_ASM_COMPILER_ID was also set, and doesn't try to set it. +# Without CMAKE_ASM_COMPILER_ID, cmake can't set +# CMAKE_ASM_COMPILER_OPTIONS_TARGET either, which means +# CMAKE_ASM_COMPILER_TARGET is ignored, causing cross compiling to +# fail, i.e., `--target=${CMAKE_ASM_COMPILER_TARGET}` isn't +# passed. +# +# Patch: https://reviews.llvm.org/D42232 +# +# Workaround: pass -DBOOTSTRAP_CMAKE_ASM_COMPILER_ID=Clang + +if(NOT DEFINED BOOTSTRAP_CMAKE_SYSROOT) + message(FATAL_ERROR "Missing required argument -DBOOTSTRAP_CMAKE_SYSROOT=<sysroot path>.") +endif() + +# FIXME: Default to Linux, but should this be required? +if(NOT DEFINED BOOTSTRAP_CMAKE_SYSTEM_NAME) + set(BOOTSTRAP_CMAKE_SYSTEM_NAME Linux CACHE STRING "") +endif() + +# FIXME: Should this default be based on BOOTSTRAP_CMAKE_SYSTEM_NAME? +if(NOT DEFINED BOOTSTRAP_LLVM_DEFAULT_BOOTSTRAP_TRIPLE) + set(BOOTSTRAP_LLVM_DEFAULT_BOOTSTRAP_TRIPLE "x86_64-unknown-linux-gnu") +endif() + +if(NOT DEFINED BOOTSTRAP_GCC_INSTALL_PREFIX) + # Force clang to look for gcc at runtime -- otherwise it will + # default to 4.2.1. + set(BOOTSTRAP_GCC_INSTALL_PREFIX "/usr" CACHE STRING "") +endif() + +# Allow user to pass a custom stage2 cache file. +if(DEFINED STAGE2_CACHE_FILE) + list(APPEND EXTRA_ARGS -C${STAGE2_CACHE_FILE}) +endif() + +list(APPEND EXTRA_ARGS + -DCMAKE_C_COMPILER_TARGET=${BOOTSTRAP_LLVM_DEFAULT_BOOTSTRAP_TRIPLE} + -DCMAKE_CXX_COMPILER_TARGET=${BOOTSTRAP_LLVM_DEFAULT_BOOTSTRAP_TRIPLE} + -DCMAKE_ASM_COMPILER_TARGET=${BOOTSTRAP_LLVM_DEFAULT_BOOTSTRAP_TRIPLE} + + # Adjust the default behaviour of the FIND_XXX() commands to only + # search for headers and libraries in the + # CMAKE_SYSROOT/CMAKE_FIND_ROOT_PATH, and always search for programs + # in the host system. These all default to BOTH. + -DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=NEVER + -DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY=ONLY + -DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE=ONLY + ) + +set(LLVM_TARGETS_TO_BUILD Native CACHE STRING "") +set(CMAKE_BUILD_TYPE RELEASE CACHE STRING "") +set(LLVM_ENABLE_ASSERTIONS ON CACHE BOOL "") + +set(LLVM_INCLUDE_DOCS OFF CACHE BOOL "") +set(LLVM_INCLUDE_EXAMPLES OFF CACHE BOOL "") +set(LLVM_INCLUDE_RUNTIMES OFF CACHE BOOL "") +set(LLVM_INCLUDE_TESTS OFF CACHE BOOL "") +set(LLVM_INCLUDE_UTILS OFF CACHE BOOL "") +set(CLANG_BUILD_TOOLS OFF CACHE BOOL "") +set(CLANG_ENABLE_ARCMT OFF CACHE BOOL "") +set(CLANG_ENABLE_STATIC_ANALYZER OFF CACHE BOOL "") + +# FIXME: Is there a better way to specify this? i.e., target is elf, +# but host isn't. +if(CMAKE_HOST_APPLE) + # Make sure at least clang and lld are included. + set(LLVM_ENABLE_PROJECTS ${LLVM_ENABLE_PROJECTS} clang lld CACHE STRING "") + + # Passing -fuse-ld=lld is hard for cmake to handle correctly, so + # make lld the default linker. + set(CLANG_DEFAULT_LINKER lld CACHE STRING "") + + list(APPEND EXTRA_ARGS + -DLLVM_ENABLE_LLD=ON + -DCMAKE_AR=${CMAKE_BINARY_DIR}/bin/llvm-ar + -DCMAKE_RANLIB=${CMAKE_BINARY_DIR}/bin/llvm-ranlib + -DCLANG_TABLEGEN=${CMAKE_BINARY_DIR}/bin/clang-tblgen + -DLLVM_TABLEGEN=${CMAKE_BINARY_DIR}/bin/llvm-tblgen + -DLLVM_CONFIG_EXE=${CMAKE_BINARY_DIR}/bin/llvm-config + ) + +endif() + +set(CLANG_ENABLE_BOOTSTRAP ON CACHE BOOL "") +set(CLANG_BOOTSTRAP_CMAKE_ARGS ${EXTRA_ARGS} CACHE STRING "")
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