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[cmake] Fix get_llvm_lit_path() to respect LLVM_EXTERNAL_LIT always

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Refactor the get_llvm_lit_path() logic to respect LLVM_EXTERNAL_LIT,
and require the fallback to be defined explicitly
as LLVM_DEFAULT_EXTERNAL_LIT. This fixes building libcxx standalone
after r346888.

The old logic was using LLVM_EXTERNAL_LIT both as user-defined cache
variable and an optional pre-definition of default value from caller
(e.g. libcxx). It included a hack to make this work by assigning
the value back and forth but it was fragile and stopped working
in libcxx.

The new logic is simpler and more transparent. Default value is
provided in a separate variable, and used only when user-specified
variable is empty (i.e. not overriden).

Differential Revision: https://reviews.llvm.org/D57282

llvm-svn: 352374
This commit is contained in:
Michal Gorny 2019-01-28 15:16:03 +00:00
parent f59166341c
commit af50a668bf
1 changed files with 0 additions and 1 deletions
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cmake/modules/AddLLVM.cmake
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@ -1280,7 +1280,6 @@ function(get_llvm_lit_path base_dir file_name)
cmake_parse_arguments(ARG "ALLOW_EXTERNAL" "" "" ${ARGN})
if (ARG_ALLOW_EXTERNAL)
set(LLVM_DEFAULT_EXTERNAL_LIT "${LLVM_EXTERNAL_LIT}")
set (LLVM_EXTERNAL_LIT "" CACHE STRING "Command used to spawn lit")
if ("${LLVM_EXTERNAL_LIT}" STREQUAL "")
set(LLVM_EXTERNAL_LIT "${LLVM_DEFAULT_EXTERNAL_LIT}")