beanz abandoned this revision.
beanz added a comment.
Short answer. I was doing something terrible and wrong in out-of-tree code, and
this was getting tripped up. I was reading the LIBCXX_INSTALL_* variables from
a higher-level CMake file. I've stopped doing that (because it was stupid), so
I'll abandon this patch.
For context the CMake behavior I was hitting was this:
CMakeLists.txt:
add_subdirectory(foo)
message(STATUS "VAR = ${VAR}") # prints On
foo/CMakeLists.txt:
option(VAR "description" ON)
set(VAR OFF)
message(STATUS "VAR = ${VAR}") # prints OFF
Overriding a cached variable in CMake only overrides it in the current scope
and lower.
http://reviews.llvm.org/D15161
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