https://bugs.llvm.org/show_bug.cgi?id=42066
Bug ID: 42066
Summary: clang-cl with /P and /Brepro fails with a cryptic
error message
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: brucedaw...@chromium.org
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
Bug https://bugs.llvm.org/show_bug.cgi?id=38508 reported a host of errors when
preprocessing a file in the context of the Chromium build. Most of those errors
were fixed but one remains. I started with the repro steps from the previous
bug but I managed to reduce it greatly.
c:\src\chromium3\src\out\release>type test.cpp
int x;
c:\src\chromium3\src\out\release>..\..\third_party\llvm-build\Release+Asserts\bin\clang-cl.exe
/P /Brepro /c test.cpp
clang-cl: warning: argument unused during compilation:
'-mno-incremental-linker-compatible' [-Wunused-command-line-argument]
That's it. I don't know *why* /Brepro triggers this error message, but it does.
Preprocessing files is a valuable investigative technique so getting this to
work again would be great.
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