[LLVMbugs] [Bug 13119] New: Distinguish between unsupported vs. unused arguments

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=13119

             Bug #: 13119
           Summary: Distinguish between unsupported vs. unused arguments
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Driver
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: dgregor at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Given an empty t.cpp, I get the same warning for this:

$ clang -arch x86_64 -c -mthumb t.cpp 
clang: warning: argument unused during compilation: '-mthumb'

where -mthumb doesn't make sense because it doesn't apply on x86-64 as this:

$ clang -arch armv7 -c -mthumb-my-nose t.cpp 
clang: warning: argument unused during compilation: '-mthumb-my-nose'

where -mthumb-my-nose is a completely unknown option.

It would be useful to distinguish these two cases with different warning
messages.

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