[LLVMbugs] [Bug 2963] New: "enumerator value is not an integer constant" error when using macros

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2963

           Summary: "enumerator value is not an integer constant" error when
                    using macros
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: parser
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: alexei.svitkine at gmail.com
                CC: llvmbugs at cs.uiuc.edu


I have some code:

typedef short short_fixed;

enum
{
        // 8.8 short_fixed
        SHORT_FIXED_FRACTIONAL_BITS= 8,
        SHORT_FIXED_ONE= 1<<SHORT_FIXED_FRACTIONAL_BITS
};

#define FLOAT_TO_SHORT_FIXED(f) ((short_fixed)((f)*SHORT_FIXED_ONE))

enum
{
        SOME_VALUE= FLOAT_TO_SHORT_FIXED(0.1)
};

This code causes clang to output the following error:

error: enumerator value for 'SOME_VALUE' is not an integer constant
        SOME_VALUE = FLOAT_TO_SHORT_FIXED(0.1)

However, the same code is accepted fine by both GCC and VC++ 7.


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