On 2021-04-16 07:11:27 +0200, Christian Jullien wrote:
> Even more strange, __LINE__ type changes as it overflows on clang, and gcc:
>
> int
> main() {
> #line 2147483647
> printf("__LINE__: %s\n", TYPEOF(__LINE__));
> #line 3000000000
> printf("__LINE__: %s\n", TYPEOF(__LINE__));
> }
>
> jullien@sims4:~ $ gcc -std=c11 foo.c -o foo && ./foo
> __LINE__: int
> __LINE__: long long
I think that this is expected. The standard just says that it is an
integer constant, not that it has a fixed type (which could break
many applications, as the largest type would have to be chosen even
for small line numbers). In practice, it just probably gives a
sequence of decimal digits (without a suffix), and the type is
deduced as usual for integer constants.
--
Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
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