r260201 - [CMake] Providing a CMake cache for 3-stage builds

[Sean Silva via cfe-commits]

Neat! Besides the awesomeness of the bootstrap, I didn't know about the -C
option! (well, except that you told me about it at the social last week,
but this is the first time I saw the actual usage).

btw, the README.txt in cmake/caches says "The first two cache files in the
directory" -- but it's not clear what the "first two" are. Could you update
the description there?

-- Sean Silva

On Mon, Feb 8, 2016 at 10:01 PM, Chris Bieneman via cfe-commits <
cfe-commits at lists.llvm.org> wrote:

> Author: cbieneman
> Date: Tue Feb  9 00:01:47 2016
> New Revision: 260201
>
> URL: http://llvm.org/viewvc/llvm-project?rev=260201&view=rev
> Log:
> [CMake] Providing a CMake cache for 3-stage builds
>
> This cache file can be used to generate a 3-stage clang build. You can
> configure using the following CMake command:
>
> cmake -C <path to clang>/cmake/caches/3-stage.cmake -G Ninja <path to llvm>
>
> You can then run "ninja stage3-clang" to build stage1, stage2 and stage3
> clangs.
>
> This is useful for finding non-determinism the compiler by verifying that
> stage2 and stage3 are identical.
>
> Added:
>     cfe/trunk/cmake/caches/3-stage.cmake
>
> Added: cfe/trunk/cmake/caches/3-stage.cmake
> URL:
> http://llvm.org/viewvc/llvm-project/cfe/trunk/cmake/caches/3-stage.cmake?rev=260201&view=auto
>
> ==============================================================================
> --- cfe/trunk/cmake/caches/3-stage.cmake (added)
> +++ cfe/trunk/cmake/caches/3-stage.cmake Tue Feb  9 00:01:47 2016
> @@ -0,0 +1,34 @@
> +set(CMAKE_BUILD_TYPE RELEASE CACHE STRING "")
> +set(CLANG_ENABLE_BOOTSTRAP ON CACHE BOOL "")
> +set(LLVM_BUILD_EXTERNAL_COMPILER_RT ON CACHE BOOL "")
> +set(LLVM_TARGETS_TO_BUILD X86 CACHE STRING "")
> +set(BOOTSTRAP_LLVM_ENABLE_LTO ON CACHE BOOL "")
> +
> +set(CLANG_BOOTSTRAP_PASSTHROUGH
> +  CLANG_ENABLE_BOOTSTRAP
> +  LLVM_BUILD_EXTERNAL_COMPILER_RT
> +  LLVM_TARGETS_TO_BUILD
> +  CLANG_BOOTSTRAP_PASSTHROUGH
> +  BOOTSTRAP_LLVM_ENABLE_LTO
> +  CMAKE_BUILD_TYPE
> +  CACHE STRING "")
> +
> +set(CLANG_BOOTSTRAP_TARGETS
> +  clang
> +  check-all
> +  check-llvm
> +  check-clang
> +  test-suite
> +  stage3
> +  stage3-clang
> +  stage3-check-all
> +  stage3-check-llvm
> +  stage3-check-clang
> +  stage3-test-suite CACHE STRING "")
> +
> +set(BOOTSTRAP_CLANG_BOOTSTRAP_TARGETS
> +  clang
> +  check-all
> +  check-llvm
> +  check-clang
> +  test-suite CACHE STRING "")
>
>
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