Follow-up Comment #1, bug #36571 (project avr-libc):
Here is the output for -mint8:
$ echo | avr-gcc-4.7.2 -x c - -E -dM -mint8 | sort | grep 'INT.*_C'
#define __INT16_C(c) c ## L
#define __INT32_C(c) c ## LL
#define __INT8_C(c) c
#define __INTMAX_C(c) c ## LL
#define __UINT16_C(c) c ## UL
#define __UINT32_C(c) c ## ULL
#define __UINT8_C(c) c ## U
#define __UINTMAX_C(c) c ## ULL
Notice that simply adopting this does not work with macros. Just consider:
#define F_CPU 0x80000
long f (void)
{
return INT32_C (F_CPU);
}
which works with
#define INT32_C(c) __INT32_C(c)
but fails with
#define INT32_C(c) c ## L
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