[LLVMbugs] [Bug 3943] New: Defining/undefining builtin macros

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3943

           Summary: Defining/undefining builtin macros
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: NetBSD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: preprocessor
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: neil at daikokuya.co.uk
                CC: llvmbugs at cs.uiuc.edu


The standard forbids this, but it is not a constraint.  Clang diagnoses some
but not others, e.g.

#undef __LINE__   // diagnosed
#undef __STDC_HOSTED__ // undiagnosed


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