I've done some further digging, and it appears this feature was added to
GNU as about 8 years ago:

https://github.com/bminor/binutils-gdb/commit/d02603dc201f80cd9d2a1f4b1a16110b1e04222b
(commit: d02603d "Allow symbol and label names to be enclosed in double
quotes.")

I guess libgccjit predates this and the change wasn't propagated to it. I
think I will do some hacking on libgccjit to remove the check on symbol
names locally and see if it works.

Cheers,
*J.S.*



*My PGP Public Key Identity*

pub   4096R/*B7A947E4* 2016-11-16 [expires: 2017-05-15]
      Key fingerprint = *E2C4 514F F0FA 52D1 896A  B1D6 3D42 BFD9 B7A9 47E4*
uid       Joshua Saxby <joshua.a.saxby+UMvLnvbsOxBHaeiCHvbdunpz@gmail.com>
uid                   Joshua Saxby (saxbophone) <joshua.a.saxby@gmail.com>
sub   4096R/0A445946 2016-11-16 [expires: 2017-05-15]




On Mon, 10 Apr 2023 at 15:51, Joshua Saxby <joshua.a.saxby@gmail.com> wrote:

> Thanks for that info Marc, I can't believe I missed it!
>
> I had a feeling that assemblers/object files were pretty permissive to
> symbol names at least in principle.
>
> This seems to contradict that comment from libgccjit source that I brought
> up earlier, I wonder what other technical limitations (if any) are there in
> the character set that jit's symbols can support?
>
> Thanks,
> *J.S.*
>
>
>
> *My PGP Public Key Identity*
>
> pub   4096R/*B7A947E4* 2016-11-16 [expires: 2017-05-15]
>       Key fingerprint = *E2C4 514F F0FA 52D1 896A  B1D6 3D42 BFD9 B7A9
> 47E4*
> uid       Joshua Saxby <joshua.a.saxby+UMvLnvbsOxBHaeiCHvbdunpz@gmail.com>
> uid                   Joshua Saxby (saxbophone) <joshua.a.saxby@gmail.com>
> sub   4096R/0A445946 2016-11-16 [expires: 2017-05-15]
>
>
>
>
> On Mon, 10 Apr 2023 at 15:43, Marc Nieper-Wißkirchen <
> marc.nieper@gmail.com> wrote:
>
>> According to the documentation of the GNU assembler at
>> https://sourceware.org/binutils/docs/as/Symbol-Intro.html, any
>> characters except for the NUL character are allowed in symbol names.
>>
>> Am Mo., 10. Apr. 2023 um 16:40 Uhr schrieb Joshua Saxby via Jit
>> <jit@gcc.gnu.org>:
>> >
>> > Dear All,
>> >
>> > I noticed that currently libgccjit restricts symbol names for generated
>> > functions (and I assume all other symbols) to match the rules for C
>> symbol
>> > names, that is, alphanumeric and underscores.
>> >
>> > From the source for gcc_jit_context_new_function() (
>> >
>> https://github.com/gcc-mirror/gcc/blob/725bcdeec60771cb9ee387978716028b64ea1b7f/gcc/jit/libgccjit.cc#L1173-L1177
>> > ):
>> >
>> >   /* The assembler can only handle certain names, so for now, enforce
>> >      C's rules for identifiers upon the name, using ISALPHA and ISALNUM
>> >      from safe-ctype.h to ignore the current locale.
>> >      Eventually we'll need some way to interact with e.g. C++ name
>> >      mangling.  */
>> >
>> > I've seen some suggestions elsewhere that some assemblers can handle
>> > symbols with wider varieties of symbols than these, I have struggled to
>> > find any documentation of the exact restrictions on symbol-naming in the
>> > assembler itself (I could assume it's identical to C symbol naming
>> rules,
>> > but I like to be sure), any pointers to where I could find such a
>> > specification? Also, any plans to follow up on the hinted extension
>> toward
>> > the end of that comment, RE C++ name mangling?
>> >
>> > Best Regards,
>> >
>> > *J.S.*
>> >
>> >
>> >
>> > *My PGP Public Key Identity*
>> >
>> > pub   4096R/*B7A947E4* 2016-11-16 [expires: 2025-12-31]
>> >       Key fingerprint = *E2C4 514F F0FA 52D1 896A  B1D6 3D42 BFD9 B7A9
>> 47E4*
>> > uid       Joshua Saxby <
>> joshua.a.saxby+UMvLnvbsOxBHaeiCHvbdunpz@gmail.com>
>> > uid                   Joshua Saxby (saxbophone) <
>> joshua.a.saxby@gmail.com>
>> > sub   4096R/0A445946 2016-11-16 [expires: 2025-12-31]
>>
>