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[CMake] Allow LLVM_EXTERNAL_<proj>_SOURCE_DIR to be overridden if it is

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empty.

This makes adding projects to LLVM_ENABLE_PROJECTS possible.
Also its type should be PATH.

https://bugs.llvm.org/show_bug.cgi?id=42698

Reviewers: beanz, greened, chapuni

Reviewed by: beanz

Differential Revision: https://reviews.llvm.org/D65045

llvm-svn: 367144
This commit is contained in:
Yuanfang Chen 2019-07-26 19:25:57 +00:00
parent 5be52df41c
commit 2031d6473b
1 changed files with 5 additions and 1 deletions
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6
CMakeLists.txt
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@ -95,7 +95,11 @@ if (LLVM_ENABLE_PROJECTS_USED OR NOT LLVM_ENABLE_PROJECTS STREQUAL "")
if(NOT EXISTS "${PROJ_DIR}" OR NOT IS_DIRECTORY "${PROJ_DIR}")
message(FATAL_ERROR "LLVM_ENABLE_PROJECTS requests ${proj} but directory not found: ${PROJ_DIR}")
endif()
set(LLVM_EXTERNAL_${upper_proj}_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../${proj}" CACHE STRING "")
if( LLVM_EXTERNAL_${upper_proj}_SOURCE_DIR STREQUAL "" )
set(LLVM_EXTERNAL_${upper_proj}_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../${proj}" CACHE PATH "" FORCE)
else()
set(LLVM_EXTERNAL_${upper_proj}_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../${proj}" CACHE PATH "")
endif()
elseif ("${proj}" IN_LIST LLVM_EXTERNAL_PROJECTS)
message(STATUS "${proj} project is enabled")
set(SHOULD_ENABLE_PROJECT TRUE)