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[CMake] Honor LLVM_EXTERNAL_<proj>_SOURCE_DIR

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When LLVM_ENABLE_PROJECTS is set, CMake assumes the project
directories are all side-by-side. This is not always the case and
there's no reason to expect it if LLVM_EXTERNAL_<proj>_SOURCE_DIR is
set. Honor that setting if it exists and allow the build configuration
to continue.

Differential Revision: https://reviews.llvm.org/D49672

llvm-svn: 354693
This commit is contained in:
David Greene 2019-02-22 21:19:48 +00:00
parent 6638a8d664
commit c8d9305d8b
1 changed files with 1 additions and 1 deletions
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2
CMakeLists.txt
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@ -140,7 +140,7 @@ 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}")
set(LLVM_EXTERNAL_${upper_proj}_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../${proj}" CACHE STRING "")
else()
message(STATUS "${proj} project is disabled")
set(SHOULD_ENABLE_PROJECT FALSE)