[PATCH] D26365: Add experimental support for unofficial monorepo-like directory layout

[Mehdi AMINI via llvm-commits]

mehdi_amini created this revision.
mehdi_amini added reviewers: bogner, beanz, jlebar.
mehdi_amini added a subscriber: llvm-commits.
Herald added a subscriber: mgorny.

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.


https://reviews.llvm.org/D26365

Files:
  llvm/CMakeLists.txt


Index: llvm/CMakeLists.txt
===================================================================
--- llvm/CMakeLists.txt
+++ llvm/CMakeLists.txt
@@ -93,6 +93,25 @@
   endif()
 endif()
 
+# Git Mono-Repo handling: automatically set the LLVM_EXTERNAL_${project}_SOURCE_DIR
+set(LLVM_ALL_PROJECTS "clang;libcxx;libcxxabi;lldb;compiler-rt;lld;polly")
+set(LLVM_ENABLE_PROJECTS "" CACHE STRING
+	"Semicolon-separated list of projects to build (${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}/../${proj}")
+  if (proj STREQUAL "clang")
+    set(LLVM_EXTERNAL_CLANG_TOOLS_EXTRA_SOURCE_DIR "${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.")


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