https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122909
Bug ID: 122909
Summary: Error while type encoding bit-field of _Bool type
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: objc
Assignee: unassigned at gcc dot gnu.org
Reporter: kaloian at doganov dot org
CC: iains at gcc dot gnu.org
Target Milestone: ---
When the type encoder encounters a type containing a _Bool bit-field, it errors
out with the "trying to encode non-integer type as a bit-field".
Minimal reproduction case:
$ cat > foo.m <<EOF
typedef struct {
_Bool b: 1;
} Body;
int
main (void)
{
@encode (Body);
return 0;
}
EOF
$ make LDLIBS=-lobjc foo
cc foo.m -lobjc -o foo
foo.m: In function ‘main’:
foo.m:8:3: error: trying to encode non-integer type as a bit-field
8 | @encode (Body);
| ^
make: *** [<builtin>: foo] Error 1
I am using a recent GCC 16 from trunk:
$ gcc -v
Using built-in specs.
COLLECT_GCC=/home/kaloian/opt/gcc-objc-encode-baseline/bin/gcc
COLLECT_LTO_WRAPPER=/home/kaloian/opt/gcc-objc-encode-baseline/libexec/gcc/aarch64-unknown-linux-gnu/16.0.0/lto-wrapper
Target: aarch64-unknown-linux-gnu
Configured with: ../../gcc/configure --enable-languages=c,c++,objc,obj-c++,lto
--prefix=/home/kaloian/opt/gcc-objc-encode-baseline
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 16.0.0 20251127 (experimental) (GCC)
The same problem is reproducible also with GCC 14 and likely exists in even
earlier versions.
Perhaps since I don't know any better, I don't see a good reason why _Bool
bit-fields shouldn't be encoded. So I'll propose a patch soon.
