llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT--> @llvm/pr-subscribers-clang Author: Tom Stellard (tstellar) <details> <summary>Changes</summary> The goal of these cache files is to provide a toolchain that: 1. Relies on only LLVM components (as much as possible). 2. Is highly optimized. These cache files will produce a full toolchain (clang/compiler-rt/libcxx/lld) where clang is built with LTO, PGO, and BOLT optimizations, and is statically linked with an LTO optimized libc++ and compiler-rt. I would eventually like to use these as the basis for the release builds. --- Full diff: https://github.com/llvm/llvm-project/pull/117802.diff 5 Files Affected: - (added) clang/cmake/caches/llvm-toolchain/stage1.cmake (+13) - (added) clang/cmake/caches/llvm-toolchain/stage2.cmake (+20) - (added) clang/cmake/caches/llvm-toolchain/stage3-instrumented.cmake (+10) - (added) clang/cmake/caches/llvm-toolchain/stage3.cmake (+16) - (added) clang/cmake/caches/llvm-toolchain/usage.rst (+20) ``````````diff diff --git a/clang/cmake/caches/llvm-toolchain/stage1.cmake b/clang/cmake/caches/llvm-toolchain/stage1.cmake new file mode 100644 index 00000000000000..13a0a7871dcd26 --- /dev/null +++ b/clang/cmake/caches/llvm-toolchain/stage1.cmake @@ -0,0 +1,13 @@ +# Stage 1: +# * Build the prerequisites for stage 2. +# * We will be building an LTO optimized libcxx in stage 2, so we need to +# build clang and lld. + + +set(CMAKE_BUILD_TYPE Release CACHE STRING "") +set(LLVM_TARGETS_TO_BUILD Native CACHE STRING "") +set(LLVM_ENABLE_PROJECTS "clang;lld" CACHE STRING "") + +set(CLANG_ENABLE_BOOTSTRAP ON CACHE BOOL "") +set(CLANG_BOOTSTRAP_CMAKE_ARGS -C ${CMAKE_CURRENT_LIST_DIR}/stage2.cmake CACHE BOOL "") +set(CLANG_BOOTSTRAP_TARGETS stage3-check-all stage3-distribution stage3-install-distribution stage3-clang stage3-clang-bolt CACHE BOOL "") diff --git a/clang/cmake/caches/llvm-toolchain/stage2.cmake b/clang/cmake/caches/llvm-toolchain/stage2.cmake new file mode 100644 index 00000000000000..87ac7899b205ef --- /dev/null +++ b/clang/cmake/caches/llvm-toolchain/stage2.cmake @@ -0,0 +1,20 @@ +# Stage 2: +# * Build an LTO optimized libcxx, so we can staticially link it into stage 3 +# clang. +# * Stage 3 will be PGO optimized, so we need to build clang, lld, and +# compiler-rt in stage 2. + + +set(CMAKE_BUILD_TYPE Release CACHE STRING "") +set(LLVM_TARGETS_TO_BUILD Native CACHE STRING "") +set(LLVM_ENABLE_RUNTIMES "compiler-rt;libcxx;libcxxabi;libunwind" CACHE STRING "" FORCE) +set(LLVM_ENABLE_PROJECTS "clang;lld" CACHE STRING "" FORCE) + +set(CLANG_ENABLE_BOOTSTRAP ON CACHE BOOL "") +set(CLANG_BOOTSTRAP_CMAKE_ARGS -C ${CMAKE_CURRENT_LIST_DIR}/stage3-instrumented.cmake CACHE BOOL "") +set(BOOTSTRAP_LLVM_BUILD_INSTRUMENTED IR CACHE BOOL "") +set(CLANG_BOOTSTRAP_TARGETS stage3-check-all stage3-distribution stage3-install-distribution stage3-clang stage3-clang-bolt CACHE BOOL "") +set(LIBCXX_STATICALLY_LINK_ABI_IN_STATIC_LIBRARY ON CACHE STRING "") +set(RUNTIMES_CMAKE_ARGS "-DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON" CACHE STRING "") +set(LLVM_ENABLE_LLD ON CACHE STRING "") +#set(CLANG_DEFAULT_RTLIB compiler-rt CACHE STRING "") diff --git a/clang/cmake/caches/llvm-toolchain/stage3-instrumented.cmake b/clang/cmake/caches/llvm-toolchain/stage3-instrumented.cmake new file mode 100644 index 00000000000000..4570a6c758ccda --- /dev/null +++ b/clang/cmake/caches/llvm-toolchain/stage3-instrumented.cmake @@ -0,0 +1,10 @@ +# Stage 3 instrumented: +# * Build an instrumented clang, so we can generate profile data for stage 3. + + +set(CLANG_ENABLE_BOOTSTRAP ON CACHE BOOL "") +set(CLANG_BOOTSTRAP_CMAKE_ARGS -C ${CMAKE_CURRENT_LIST_DIR}/stage3.cmake CACHE BOOL "") +set(CLANG_BOOTSTRAP_TARGETS clang check-all distribution install-distribution clang-bolt CACHE BOOL "") +set(CLANG_BOLT OFF CACHE STRING "") + +include(${CMAKE_CURRENT_LIST_DIR}/stage3.cmake) diff --git a/clang/cmake/caches/llvm-toolchain/stage3.cmake b/clang/cmake/caches/llvm-toolchain/stage3.cmake new file mode 100644 index 00000000000000..a9050a64d8f633 --- /dev/null +++ b/clang/cmake/caches/llvm-toolchain/stage3.cmake @@ -0,0 +1,16 @@ +# Stage 3: +# * This is the final stage. +# * The goals is to have a clang that is LTO, PGO, and bolt optimized and also +# statically linked to libcxx and compiler-rt. + +set(LLVM_TARGETS_TO_BUILD Native CACHE STRING "") +set(LLVM_ENABLE_RUNTIMES "compiler-rt;libcxx;libcxxabi;libunwind" CACHE STRING "" FORCE) +set(LLVM_ENABLE_PROJECTS "clang;lld;bolt;" CACHE STRING "" FORCE) +set(LLVM_ENABLE_LLD ON CACHE STRING "") +set(LLVM_ENABLE_LTO THIN CACHE STRING "") +set(LLVM_ENABLE_LIBCXX ON CACHE STRING "") +set(LLVM_STATIC_LINK_CXX_STDLIB ON CACHE STRING "") +set(CLANG_BOLT "INSTRUMENT" CACHE STRING "") +set(CMAKE_EXE_LINKER_FLAGS "-Wl,--emit-relocs,-znow -rtlib=compiler-rt --unwindlib=libunwind -static-libgcc" CACHE STRING "") +set(CMAKE_SHARED_LINKER_FLAGS "-rtlib=compiler-rt --unwindlib=libunwind -static-libgcc" CACHE STRING "") +set(LLVM_DISTRIBUTION_COMPONENTS "clang;lld;runtimes;clang-resource-headers" CACHE STRING "") diff --git a/clang/cmake/caches/llvm-toolchain/usage.rst b/clang/cmake/caches/llvm-toolchain/usage.rst new file mode 100644 index 00000000000000..82b6d678669643 --- /dev/null +++ b/clang/cmake/caches/llvm-toolchain/usage.rst @@ -0,0 +1,20 @@ +# LLVM Toolchain Build + +This directory contains cache files for building a complete LLVM-based toolchain. +The resulting clang build will be LTO, PGO, and BOLT optimized and statically +linked against libc++ and compiler-rt. + +The build is done in 4 stages: + +* Stage 1: Build clang/lld. +* Stage 2: Build an LTO optimized libc++ with Stage 1 clang/lld. +* Stage 3 Instrumented: Build clang with instrumentation in order to generate + profile data for PGO. +* Stage 3: Build clang with LTO, PGO, and BOLT optimizations and statically link + with stage2 libc++ and compiler-rt. + +## Usage + +.. + cmake -S llvm -B build -C clang/cmake/caches/llvm-toolchain/stage1.cmake + ninja stage3-install-distribution `````````` </details> https://github.com/llvm/llvm-project/pull/117802 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
