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[cmake] Add helper for finding potentially external projects

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I plan to use this from compiler-rt, but it's useful for any LLVM
project that depends on more than just LLVM.

llvm-svn: 244633
This commit is contained in:
Reid Kleckner 2015-08-11 17:16:35 +00:00
parent f473c5974a
commit 680373b126
1 changed files with 17 additions and 0 deletions
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17
cmake/modules/AddLLVM.cmake
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@ -717,6 +717,23 @@ macro(add_llvm_tool_subdirectory name)
add_llvm_external_project(${name})
endmacro(add_llvm_tool_subdirectory)
# Finds a (potentially external) project that normally lives at
# llvm/${subdir}/${name}. For example, to find clang:
# find_llvm_external_project(tools clang CLANG_SRC)
# Returns nothing if the project is not configured to build.
function(find_llvm_external_project subdir name path_out)
canonicalize_tool_name(${name} nameUPPER)
if (NOT LLVM_TOOL_${nameUPPER}_BUILD)
set(${path_out} PARENT_SCOPE)
elseif (EXISTS LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR)
set(${path_out} LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR PARENT_SCOPE)
elseif (EXISTS ${LLVM_MAIN_SRC_DIR}/${subdir}/${name})
set(${path_out} ${LLVM_MAIN_SRC_DIR}/${subdir}/${name} PARENT_SCOPE)
else()
set(${path_out} PARENT_SCOPE)
endif()
endfunction(find_llvm_external_project)
function(get_project_name_from_src_var var output)
string(REGEX MATCH "LLVM_EXTERNAL_(.*)_SOURCE_DIR"
MACHED_TOOL "${var}")