tree 75b5f70d7bebda38b7b58ac994379d3a75c97072
parent 6a7c61d1c30f8767b7821bd23916621f590c5b19
author Michal Gorny <mgorny@gentoo.org> 1548688563 +0000
committer Michal Gorny <mgorny@gentoo.org> 1548688563 +0000

[cmake] Fix get_llvm_lit_path() to respect LLVM_EXTERNAL_LIT always

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

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@352374 91177308-0d34-0410-b5e6-96231b3b80d8