[LLVMbugs] [Bug 11488] New: Clang should warn on the use of reserved identifier/macro names

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11488

             Bug #: 11488
           Summary: Clang should warn on the use of reserved
                    identifier/macro names
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: vanboxem.ruben at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


For C, Clang should warn when user code uses identifiers or macros that are
implementation-reserved.

For C(99), this would mean names starting with an underscore followed by
another unerscore or capitalized letter.

For C++ a single underscore is also reserved for the global namespace.

I could have messed the above rules up, but these are the cause of a lot of
unexpected bugs, and a warning would be super-easy to implement.

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