Index: cmake/platforms/ClangClCMakeCompileRules.cmake
===================================================================
--- /dev/null
+++ cmake/platforms/ClangClCMakeCompileRules.cmake
@@ -0,0 +1,9 @@
+# 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}")
Index: cmake/platforms/WinMsvc.cmake
===================================================================
--- cmake/platforms/WinMsvc.cmake
+++ cmake/platforms/WinMsvc.cmake
@@ -306,3 +306,5 @@
 # resulting warnings about missing libraries.
 set(CMAKE_INSTALL_SYSTEM_RUNTIME_LIBS_NO_WARNINGS ON)
 
+# Allow clang-cl to work with macOS paths.
+set(CMAKE_USER_MAKE_RULES_OVERRIDE "${CMAKE_CURRENT_LIST_DIR}/ClangClCMakeCompileRules.cmake")