tree 68cb537c3dc7222a0aff8eaa8f6999bf1745868c
parent 6743065bab322b7970929d376fd4507216c14c24
author Hans Wennborg <hans@hanshq.net> 1548771850 +0000
committer Hans Wennborg <hans@hanshq.net> 1548771850 +0000

Merging r352374:
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r352374 | mgorny | 2019-01-28 16:16:03 +0100 (Mon, 28 Jan 2019) | 18 lines

[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
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git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/branches/release_80@352498 91177308-0d34-0410-b5e6-96231b3b80d8