forked from OSchip/llvm-project
b2920a779c
Summary: This patch adds support for the clang multi-stage bootstrapping to support PGO profdata generation, and can build a 2 or 3 stage compiler. With this patch applied you can configure your build directory with the following invocation of CMake: cmake -G <generator> -C <path_to_clang>/cmake/caches/PGO.cmake <source dir> After configuration the following additional targets will be generated: stage2-instrumented: Builds a stage1 x86 compiler, runtime, and required tools (llvm-config, llvm-profdata) then uses that compiler to build an instrumented stage2 compiler. stage2-instrumented-generate-profdata: Depends on "stage2-instrumented" and will use the instrumented compiler to generate profdata based on the training files in <clang>/utils/perf-training stage2: Depends on "stage2-instrumented-generate-profdata" and will use the stage1 compiler with the stage2 profdata to build a PGO-optimized compiler. stage2-check-llvm: Depends on stage2 and runs check-llvm using the stage3 compiler. stage2-check-clang: Depends on stage2 and runs check-clang using the stage3 compiler. stage2-check-all: Depends on stage2 and runs check-all using the stage3 compiler. stage2-test-suite: Depends on stage2 and runs the test-suite using the stage3 compiler (requires in-tree test-suite). Reviewers: bogner, silvas, chandlerc Subscribers: cfe-commits Differential Revision: http://reviews.llvm.org/D15584 llvm-svn: 256873 |
||
|---|---|---|
| .. | ||
| Apple-stage1.cmake | ||
| Apple-stage2.cmake | ||
| PGO-stage2-instrumented.cmake | ||
| PGO-stage2.cmake | ||
| PGO.cmake | ||
| README.txt | ||
README.txt
CMake Caches ============ This directory contains CMake cache scripts that pre-populate the CMakeCache in a build directory with commonly used settings. The first two cache files in the directory are used by Apple to build the clang distribution packaged with Xcode. You can use the caches with the following CMake invocation: cmake -G <build system> -C <path to llvm>/tools/clang/cmake/caches/Apple-stage1.cmake -DCMAKE_BUILD_TYPE=Release [-DCMAKE_INSTALL_PREFIX=<install path>] <path to llvm> Building the `bootstrap` target from this generation will build clang, and `bootstrap-install` will install it.