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[cmake] [libcxx] Fix find_path() problems when cross compiling. 

When CMAKE_SYSROOT or CMAKE_FIND_ROOT_PATH is set, cmake
recommends setting CMAKE_FIND_ROOT_PATH_MODE_INCLUDE=ONLY
globally which means find_path() always prepends CMAKE_SYSROOT or
CMAKE_FIND_ROOT_PATH to all paths used in the search.

However, this find_path() invocation is looking for a path in the
libcxxabi project on the host system, not the target system,
which can be done by passing NO_CMAKE_FIND_ROOT_PATH.

Differential Revision: https://reviews.llvm.org/D41622

llvm-svn: 323143
This commit is contained in:
Don Hinton 2018-01-22 19:26:38 +00:00
parent 7c70d9d0be
commit 98bb420559
1 changed files with 1 additions and 0 deletions
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libcxx/CMakeLists.txt
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@ -123,6 +123,7 @@ if (LIBCXX_CXX_ABI STREQUAL "default")
${LLVM_MAIN_SRC_DIR}/runtimes/libcxxabi/include
${LLVM_MAIN_SRC_DIR}/../libcxxabi/include
NO_DEFAULT_PATH
NO_CMAKE_FIND_ROOT_PATH
)
if (LIBCXX_TARGETING_MSVC)
# FIXME: Figure out how to configure the ABI library on Windows.