https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124305
Bug ID: 124305
Summary: btf_decl_tag and btf_type_tag attributes give compiler
errors in C++
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: btf-debug, documentation
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: sandra at gcc dot gnu.org
Target Milestone: ---
This test case is the examples of the btf_decl_tag and btf_type_tag in the GCC
manual:
int *foo1 __attribute__ ((btf_decl_tag ("__percpu")));
int * __attribute__ ((btf_type_tag ("__user"))) bar1;
int *foo2 [[gnu::btf_decl_tag ("__percpu")]];
int * [[gnu::btf_type_tag ("__user")]] bar2;
It compiles without error in c, but with g++ the output it gives
ex.c:1:53: error: unsupported wide string type argument in 'btf_decl_tag'
attribute
1 | int *foo1 __attribute__ ((btf_decl_tag ("__percpu")));
| ^
ex.c:2:49: error: unsupported wide string type argument in 'btf_type_tag'
attribute
2 | int * __attribute__ ((btf_type_tag ("__user"))) bar1;
| ^~~~
ex.c:4:44: error: unsupported wide string type argument in 'btf_decl_tag'
attribute
4 | int *foo2 [[gnu::btf_decl_tag ("__percpu")]];
| ^
ex.c:5:40: error: unsupported wide string type argument in 'btf_type_tag'
attribute
5 | int * [[gnu::btf_type_tag ("__user")]] bar2;
| ^~~~
Compiled with arm-none-eabi-[gcc,g++] -S ex.c -gbtf
I tried adding -finput-charset=UTF-8 but that didn't help.
If this is intentionally broken in C++ the manual ought to say that it's C
only.
