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Add experimental support for unofficial monorepo-like directory layout

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Summary:
This allows to have clang and llvm and the other subprojects
side-by-side instead of nested. This can be used with the monorepo or
multiple repos.

It will help having a single set of sources checked out but allows to
have a build directory with llvm and another one with llvm+clang.
Basically it abstracts LLVM_EXTERNAL_xxxx_SOURCE_DIR making it more
convenient by adopting a convention.

Reviewers: bogner, beanz, jlebar

Subscribers: mgorny, llvm-commits

Differential Revision: https://reviews.llvm.org/D26365

llvm-svn: 286162
This commit is contained in:
Mehdi Amini 2016-11-07 22:13:38 +00:00
parent 82f1056a88
commit d060d957a1
2 changed files with 33 additions and 0 deletions
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25
CMakeLists.txt
View File

@ -93,6 +93,31 @@ if(CMAKE_HOST_APPLE AND APPLE)
endif()
endif()
# Side-by-side subprojects layout: automatically set the
# LLVM_EXTERNAL_${project}_SOURCE_DIR using LLVM_ALL_PROJECTS
# This allows an easy way of setting up a build directory for llvm and another
# one for llvm+clang+... using the same sources.
set(LLVM_ALL_PROJECTS "clang;libcxx;libcxxabi;lldb;compiler-rt;lld;polly")
set(LLVM_ENABLE_PROJECTS "" CACHE STRING
"Semicolon-separated list of projects to build (${LLVM_ALL_PROJECTS}), or \"all\".")
if( LLVM_ENABLE_PROJECTS STREQUAL "all" )
set( LLVM_ENABLE_PROJECTS ${LLVM_ALL_PROJECTS})
endif()
foreach(proj ${LLVM_ENABLE_PROJECTS})
set(PROJ_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../${proj}")
if(NOT EXISTS "${PROJ_DIR}" OR NOT IS_DIRECTORY "${PROJ_DIR}")
message(FATAL_ERROR "LLVM_ENABLE_PROJECTS requests ${proj} but directory not found: ${PROJ_DIR}")
endif()
string(TOUPPER "${proj}" upper_proj)
set(LLVM_EXTERNAL_${upper_proj}_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../${proj}")
# There is a widely spread opinion that clang-tools-extra should be merged
# into clang. The following simulates it by always enabling clang-tools-extra
# when enabling clang.
if (proj STREQUAL "clang")
set(LLVM_EXTERNAL_CLANG_TOOLS_EXTRA_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../clang-tools-extra")
endif()
endforeach()
# The following only works with the Ninja generator in CMake >= 3.0.
set(LLVM_PARALLEL_COMPILE_JOBS "" CACHE STRING
"Define the maximum number of concurrent compilation jobs.")

8
docs/CMake.rst
View File

@ -336,6 +336,14 @@ LLVM-specific variables
will not be used. If the variable for an external project does not point
to a valid path, then that project will not be built.
**LLVM_ENABLE_PROJECTS**:STRING
Semicolon-separated list of projects to build, or *all* for building all
(clang, libcxx, libcxxabi, lldb, compiler-rt, lld, polly) projects.
This flag assumes that projects are checked out side-by-side and not nested,
i.e. clang needs to be in parallel of llvm instead of nested in `llvm/tools`.
This feature allows to have one build for only LLVM and another for clang+llvm
using the same source checkout.
**LLVM_EXTERNAL_PROJECTS**:STRING
Semicolon-separated list of additional external projects to build as part of
llvm. For each project LLVM_EXTERNAL_<NAME>_SOURCE_DIR have to be specified