Clang pre-defined macros for C23 binary format?

[SchrodingerZhu]

Is there any plan to add pre-defined macros for binary format (b/B) similar to __UINT8_FMTx__?

Glibc has added PRIbN and PRIBN: https://github.com/bminor/glibc/blob/bbd248ac0d75efdef8fe61ea69b1fb25fb95b6e7/stdlib/inttypes.h#L168.

Having __UINT8_FMTb__ or __UINT8_FMTB__ will help libc to define PRIbN and PRIBN as in

llvm-project/libc/include/llvm-libc-macros/inttypes-macros.h

Line 167 in e82659f

#define PRIu8 __UINT8_FMTu__

[shafik]

CC @AaronBallman @cor3ntin

[AaronBallman]

We defer to the host system's inttypes.h:

llvm-project/clang/lib/Headers/inttypes.h

Line 21 in 4d273b9

#include_next <inttypes.h>

so it's not something I think we were planning to support directly.

[SchrodingerZhu]

@AaronBallman I agree that PRIbN is definitely for posix headers.

But UINT8_FMTx is provided as builtin macro by clang. Since we have hex format already, I think it is reasonable to also have binary format.

[AaronBallman]

Ah, I see what you're saying, thank you! Yeah, I think that's a reasonable request.

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Schrodinger ZHU Yifan (SchrodingerZhu)

Is there any plan to add pre-defined macros for binary format (`b/B`) similar to `__UINT8_FMTx__`?

Glibc has added PRIbN and PRIBN: https://github.com/bminor/glibc/blob/bbd248ac0d75efdef8fe61ea69b1fb25fb95b6e7/stdlib/inttypes.h#L168.

Having __UINT8_FMTb__ or __UINT8_FMTB__ will help libc to define PRIbN and PRIBN as in

llvm-project/libc/include/llvm-libc-macros/inttypes-macros.h

Line 167 in e82659f

#define PRIu8 __UINT8_FMTu__