llvm-mirror/cmake/platforms/ClangClCMakeCompileRules.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}")
[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 02:05:48 +01:00			`# 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}")`