https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107348
Bug ID: 107348
Summary: documentation: __builtin_classify_type() undocumented
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: colomar.6.4.3 at gmail dot com
Target Milestone: ---
I can't find any documentation about `__builtin_classify_type()`.
Moreover, it behaves weird with arrays.
$ grepc type_class
./gcc/typeclass.h:30:
enum type_class
{
no_type_class = -1,
void_type_class, integer_type_class, char_type_class,
enumeral_type_class, boolean_type_class,
pointer_type_class, reference_type_class, offset_type_class,
real_type_class, complex_type_class,
function_type_class, method_type_class,
record_type_class, union_type_class,
array_type_class, string_type_class,
lang_type_class, opaque_type_class
};
One would expect that for arrays, it would return `array_type_class`, i.e.,
`14`, but it returns `5`, i.e., `pointer_type_class`.
alx@debian:~/tmp$ cat ptr.c
#include <stdio.h>
int
main(void)
{
int a[5];
printf("%d\n", __builtin_classify_type(a));
}
alx@debian:~/tmp$ cc -Wall -Wextra ptr.c
alx@debian:~/tmp$ ./a.out
5
Please document the builtin (and also fix the handling of arrays).
