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llvm-mirror/cmake/platforms/ClangClCMakeCompileRules.cmake
Shoaib Meenai a983a79960 [cmake] Fix clang-cl cross-compilation on macOS
macOS paths usually start with /Users, which clang-cl interprets as a
macro undefine, leading to pretty much everything failing to compile.

CMake should be taught to put a -- in its compilation rules for clang-cl
(and I've been meaning to submit that upstream for a while). In the
meantime, however, and to support older CMake versions, we can just
create a custom make rules override to fix the compilation rules.

Differential Revision: https://reviews.llvm.org/D41219

llvm-svn: 320785
2017-12-15 01:05:48 +00:00

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CMake

# macOS paths usually start with /Users/*. Unfortunately, clang-cl interprets
# paths starting with /U as macro undefines, so we need to put a -- before the
# input file path to force it to be treated as a path. CMake's compilation rules
# should be tweaked accordingly, but until that's done, and to support older
# CMake versions, overriding compilation rules works well enough. This file will
# be included by cmake after the default compilation rules have already been set
# up, so we can just modify them instead of duplicating them entirely.
string(REPLACE "-c <SOURCE>" "-c -- <SOURCE>" CMAKE_C_COMPILE_OBJECT "${CMAKE_C_COMPILE_OBJECT}")
string(REPLACE "-c <SOURCE>" "-c -- <SOURCE>" CMAKE_CXX_COMPILE_OBJECT "${CMAKE_CXX_COMPILE_OBJECT}")