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Update documentation and implementation of stage3 build 

Have the build work out of the box by forcing an LLD build.

That way, we don't require an external LTO-aware linker,
as we build one.

Also remove reference to the seemingly dead builder.

Differential Revision: https://reviews.llvm.org/D88990
This commit is contained in:
Serge Guelton 2020-10-07 13:43:55 -04:00 committed by serge-sans-paille
parent a5ef2e0a1e
commit b4ffc40d62
2 changed files with 11 additions and 4 deletions
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9
clang/cmake/caches/3-stage-base.cmake
View File

@ -3,6 +3,15 @@ set(CLANG_ENABLE_BOOTSTRAP ON CACHE BOOL "")
set(LLVM_BUILD_EXTERNAL_COMPILER_RT ON CACHE BOOL "")
set(BOOTSTRAP_LLVM_ENABLE_LTO ON CACHE BOOL "")
# Use LLD do have less requirements on system linker, unless we're on an apple
# platform where the system compiler is to be prefered.
if(APPLE)
set(BOOTSTRAP_LLVM_ENABLE_LLD OFF CACHE BOOL "")
else()
set(BOOTSTRAP_LLVM_ENABLE_LLD ON CACHE BOOL "")
endif()
set(CLANG_BOOTSTRAP_TARGETS
clang
check-all

6
llvm/docs/AdvancedBuilds.rst
View File

@ -186,8 +186,6 @@ following commands:
.. code-block:: console
$ cmake -G Ninja -C <path_to_clang>/cmake/caches/3-stage.cmake <source dir>
$ ninja stage3
$ cmake --build . --target stage3 --parallel
After the build you can compare the stage2 & stage3 compilers. We have a bot
setup `here <http://lab.llvm.org:8011/builders/clang-3stage-ubuntu>`_ that runs
this build and compare configuration.
After the build you can compare the stage2 & stage3 compilers.