[LLVMbugs] [Bug 2252] New: Unexpected diagnostics in PP expression

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2252

           Summary: Unexpected diagnostics in PP expression
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: NetBSD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: preprocessor
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: neil at daikokuya.co.uk
                CC: llvmbugs at cs.uiuc.edu


For

#if -0x8000000000000000
#endif

Clang gives:

$ clang -pedantic-errors /tmp/bug.c
/tmp/bug.c:1:6: warning: integer constant is so large that it is unsigned
#if -0x8000000000000000
     ^
/tmp/bug.c:1:5: warning: integer overflow in preprocessor expression
#if -0x8000000000000000
    ^
2 diagnostics generated.

I don't think either of these is warranted.

It is true the integer is so large it is unsigned, but that is an expected
outcome for hex constants and shouldn't require a suffix - this is unlike
unsuffixed decimal constants.

The second diagnostic is simply wrong: unsigned arithmetic never overflows.


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