Don't use relpaths in lit cfg if build/source dir are on different drives.
See discussion on https://reviews.llvm.org/D77184.
diff --git a/llvm/cmake/modules/AddLLVM.cmake b/llvm/cmake/modules/AddLLVM.cmake
index 91bec7d..8be19b1 100644
--- a/llvm/cmake/modules/AddLLVM.cmake
+++ b/llvm/cmake/modules/AddLLVM.cmake
@@ -1494,8 +1494,14 @@
# outselves. cmake has no relpath function, so use Python for that.
string(REPLACE ";" "\\;" ARG_PATH_VALUES_ESCAPED "${ARG_PATH_VALUES}")
get_filename_component(OUTPUT_DIR ${site_out} DIRECTORY)
- execute_process(COMMAND "${PYTHON_EXECUTABLE}" "-c"
- "import os, sys; sys.stdout.write(';'.join(os.path.relpath(p, sys.argv[1]).replace(os.sep, '/') if p else '' for p in sys.argv[2].split(';')))"
+ execute_process(COMMAND "${PYTHON_EXECUTABLE}" "-c" "\n
+import os, sys\n
+drive = os.path.splitdrive(sys.argv[1])[0]\n
+def relpath(p):\n
+ if not p: return ''\n
+ if os.path.splitdrive(p)[0] != drive: return p\n
+ return os.path.relpath(p, sys.argv[1]).replace(os.sep, '/')\n
+sys.stdout.write(';'.join(relpath(p) for p in sys.argv[2].split(';')))"
${OUTPUT_DIR}
${ARG_PATH_VALUES_ESCAPED}
OUTPUT_VARIABLE ARG_PATH_VALUES_RELATIVE)
