[llvm-bugs] [Bug 36648] New: clang-cl silently ignores -working-directory on windows

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36648

            Bug ID: 36648
           Summary: clang-cl silently ignores -working-directory on
                    windows
           Product: clang
           Version: 5.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: daan.j.demeyer at gmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 20024
  --> https://bugs.llvm.org/attachment.cgi?id=20024&action=edit
Minimal reproduce of issue (follow instructions in comment)

I've included an attachment which reproduces the issue.

- Extract reproduce.zip and enter the root directory (with src and test
subfolders)
- "clang++.exe -I../test -working-directory=src main.cpp" succeeds
- "clang-cl.exe -I../test -working-directory=src main.cpp" fails with: 
clang-cl.exe: error: no such file or directory: 'main.cpp'
clang-cl.exe: error: no input files

clang-cl gives no warning that -working-directory is ignored. Ideally
-working-directory should either work for clang-cl.exe or a warning should be
given so that users know the option is being ignored by clang-cl.exe

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