tree e1da3bb2f3f5b0a8480fe343bb5db0f0ed6492d1
parent 9caec0a1d2064a9f189f95f366c1249533c0a7a1
author Petr Hosek <phosek@chromium.org> 1570832549 +0000
committer Petr Hosek <phosek@chromium.org> 1570832549 +0000

[libunwind] Refactor CMake flag checks to match libc++ and libc++abi

libunwind was using its own set of macros/functions for flag checking
which was similar but different from libc++ and libc++abi. This made
it difficult to replicate the same checks across projects, in fact
there were some checks that appear to have been copy & pasted from
another project and that were broken in the standalone libunwind build.
This change refactors flag checks to match libc++ and libc++abi using
a copy of HandleLibunwindFlags.cmake which is derived from the versions
used by the other projects. This also paves a road to deduplicating and
unifying HandleLibunwindFlags.cmake, HandleLibcxxabiFlags.cmake and
HandleLibcxxFlags.cmake post monorepo switch.

Differential Revision: https://reviews.llvm.org/D68855

git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@374606 91177308-0d34-0410-b5e6-96231b3b80d8