[LCP]gcc: case label does not reduce to an integer constant

[Joachim Bauernberger <bj@gmx.net>]

Can sombody kindly tell me why the above error happens when compiling 
with gcc?

The code looks as follows:

typedef struct ctype_t
{
    short type;
    .......
} ctype_t;

extern const short CT_TEXT;
.....
int foo(ctype_t *ct)
{
   
    switch (ct->type) {
        case CT_TEXT:
            break;
        .........
}

Many thanks,
Joachim

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