xiaobai created this revision. xiaobai added reviewers: zturner, labath. Herald added a reviewer: serge-sans-paille.
clang-cl tries to match cl's interface, and treats /U as "Removes a predefined macro" as cl does. When you feed clang-cl a file that begins with '/U' (e.g. /Users/xiaobai/foo.c), clang-cl will emit a warning and in some cases an error, like so: clang-9: warning: '/Users/xiaobai/foo.c' treated as the '/U' option [-Wslash-u-filename] clang-9: note: Use '--' to treat subsequent arguments as filenames clang-9: error: no input files If you're using clang-cl, make sure '--' is passed before the source file. https://reviews.llvm.org/D58860 Files: lit/helper/build.py Index: lit/helper/build.py =================================================================== --- lit/helper/build.py +++ lit/helper/build.py @@ -568,6 +568,8 @@ args.append('/c') args.append('/Fo' + obj) + if self.toolchain_type == 'clang-cl': + args.append('--') args.append(source) return ('compiling', [source], obj,
Index: lit/helper/build.py =================================================================== --- lit/helper/build.py +++ lit/helper/build.py @@ -568,6 +568,8 @@ args.append('/c') args.append('/Fo' + obj) + if self.toolchain_type == 'clang-cl': + args.append('--') args.append(source) return ('compiling', [source], obj,
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