configure script doesn't detect __attribute__((mode(SI))) correctly

[Roland Illig]

I tried to compile gmp on Solaris, using the sunpro 12 compiler.

This compiler has begun to support the __attribute__ keyword from gcc, 
but the support is not yet complete. The attribute is accepted 
syntactically, but ignored for certain values:

"../gmp-impl.h", line 2810: warning:  attribute "mode" is unknown, ignored
"../gmp-impl.h", line 2810: warning: attribute parameter "QI" is undefined
"../gmp-impl.h", line 2811: warning:  attribute "mode" is unknown, ignored
"../gmp-impl.h", line 2811: warning: attribute parameter "SI" is undefined
"

The GMP configure script should be fixed to check whether 
__attribute__((mode)) is really supported or just syntactically 
accepted. I used the following program for it:

typedef int SItype __attribute__ ((mode (SI)));
typedef int QItype __attribute__ ((mode (QI)));
int
main ()
{
   switch (1) {
   case sizeof(SItype):
   case sizeof(QItype):
   ;
   }
   return 0;
}

It works both with gcc and with sunpro, failing with a "duplicate case 
label" error if the two types are of the same size, which they shouldn't be.

Roland
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