On Tue, 30 Jan 2024, 10:35 Amol Surati via Gcc, <gcc@gcc.gnu.org> wrote:

> Hello,
>
> If a std attribute name is squeezed between 4x underscores,
>

Which is undefined behaviour, but shouldn't crash.

the compiler (both 13.2 [1] and trunk [2]) experiences an ICE.
>

Bug reports belong in bugzilla, not on the mailing list please.

https://gcc.gnu.org/bugs/

for e.g. when using [[____deprecated____]] int a;
>
> But, [[____depreated____]] int a; (i.e. the char 'c' removed from the
> spelling) does not cause ICE.
>
> Clang does not crash.
>
> Stack trace with ICE:
>
>     <source>:1:1: internal compiler error: in decl_attributes, at
> attribs.cc:751
>         1 | [[____deprecated____]] int a;
>           | ^
>     0x1b49b1e internal_error(char const*, ...)
>     ???:0
>     0x6f805c fancy_abort(char const*, int, char const*)
>     ???:0
>     0x70f62d decl_attributes(tree_node**, tree_node*, int, tree_node*)
>     ???:0
>     0x728c0e start_decl(c_declarator*, c_declspecs*, bool, tree_node*,
> bool, unsigned int*)
>     ???:0
>     0x7865dd c_parse_file()
>     ???:0
>     0x7e60b9 c_common_parse_file()
>     ???:0
>
> Thank you,
> Amol
>
> [1] https://godbolt.org/z/6PaMd9n6x
> [2] https://godbolt.org/z/fc48q5PTW
>