https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116158
Bug ID: 116158
Summary: __INTn_TYPE__ macros unexpectedly unsigned with
-funsigned-bitfields
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: mital at mitalashok dot co.uk
Target Milestone: ---
`__INT32_TYPE__` is currently defined as plain `int`.
When `int32_t` is defined with it (e.g., when ginclude/stdint-gcc.h is used in
freestanding mode), using it to define the type of a bit-field could become
unsigned.
For example: https://godbolt.org/z/1935T63df
```
// Compile with "-ffreestanding -funsigned-bitfields"
#include <stdint.h>
int main() {
struct {
int32_t bf : 1;
} x = { -1 };
if (x.bf != -1)
return 1;
}
```
Exits 1.
I don't think this is non-conforming, it's just surprising. My system headers
define `int32_t` as `signed int`, meaning there is a difference between
freestanding and hosted mode.
