Compilation errors when using explicitly-typed enum classes in bitfields (gcc C++0x/C++11)

Question

I've been happily compiling my code with GCC without issue for the past three months until I rebuilt my cross-compiler, which was when I found myself getting the message "error: bit-field '...' with non-integral type".

An example of an offending enum is below:

typedef unsigned char byte;

enum class opStatus : byte
{
    /* Process has yet to begin execution */
    Ready,
    /* Process can resume execution */
    Started,
    /* Process has completed */
    Finished,
    /* Process is handling shutdown */
    Finishing,
};

struct // Example usage
{
    opStatus Status : 2;
};

Why is this happening?

Maybe you broke your cross-compiler, or forgot to build in C++11 support. Without seeing what you actually did, and without knowing what your compiler is, there's not much else to say here. — Lightness Races in Orbit
– Lightness Races in Orbit, Commented Nov 6, 2012 at 10:13
GNU GCC G++ 4.6.0 using config C++0x. And I've re-built the compiler a number of times using fresh sources. — user1802623
– user1802623, Commented Nov 6, 2012 at 10:28
Since this seems to be an issue caused by your cross-compiler, code from that compiler would be usefull to answer this. — Nicktar
– Nicktar, Commented Nov 6, 2012 at 10:30
Note that the code struct { opStatus Status : 2; }; will give compilation error anyway even if opStatus Status : 2 is allowed in the language! You must introduce at least one name in the declaration. So write struct tag_name { opStatus Status : 2; }; or struct { opStatus Status : 2; } object_name;. — Sarfaraz Nawaz
– Sarfaraz Nawaz, Commented Nov 6, 2012 at 10:31

Raja · Accepted Answer · 2013-10-15 06:58:46Z

1

Make the bitwidth 8. Its a byte after all.

Once I did that (and added a name for the struct),

g++ -std=c++11

didn't give me any warning or error.

answered Oct 15, 2013 at 6:58

Raja

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