URL:
<http://savannah.nongnu.org/bugs/?36571>
Summary: stdint.h: INTn_C not standard compliant
Project: AVR C Runtime Library
Submitted by: gjlayde
Submitted on: Do 31 Mai 2012 20:02:57 GMT
Category: Header
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Header files
Status: None
Percent Complete: 0%
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Release: 1.8.0
Fixed Release: None
_______________________________________________________
Details:
C99: 7.18.4 Macros for integer constants
writes in clause #3 on the INTn_C function-like macros:
Each invocation of one of these macros shall expand
to an integer constant expression suitable for use
in #if preprocessing directives.
However, stdint.h defines respective macros like so
#define INT8_C(value) ((int8_t) value)
which cannot be used in #if preprocessing directives.
FYI, avr-gcc built-in defines similar macros like so, provided -mint8 is off:
$ echo | avr-gcc -x c - -E -dM | sort | grep 'INT.*_C'
#define __INT8_C(c) c
#define __INT16_C(c) c
#define __INT32_C(c) c ## L
#define __INT64_C(c) c ## LL
#define __INTMAX_C(c) c ## LL
#define __UINT8_C(c) c
#define __UINT16_C(c) c ## U
#define __UINT32_C(c) c ## UL
#define __UINT64_C(c) c ## ULL
#define __UINTMAX_C(c) c ## ULL
With -mint8 on, it should be something around (no appropriate compiler handy
at the moment)
#define __INT8_C(c) c
#define __INT16_C(c) c ## L
#define __INT32_C(c) c ## LL
#define __INTMAX_C(c) c ## LL
#define __UINT8_C(c) c ## U
#define __UINT16_C(c) c ## UL
#define __UINT32_C(c) c ## ULL
#define __UINTMAX_C(c) c ## ULL
So avr-libc could adopt these or just
#define INT8_C(c) __INT8_C(c)
which works since gcc 4.5, maybe also 4.4.
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