[Question] Will switching Linux UAPI headers from __ASSEMBLY__ to __ASSEMBLER__ affect glibc?

[Maciej W. Rozycki]

On Tue, 3 Mar 2026, Andreas Schwab wrote:

> > I would like to ask directly:
> >
> >   Will switching Linux UAPI headers from __ASSEMBLY__ to __ASSEMBLER__
> >   affect glibc in any way?
> 
> Since the compiler will define __ASSEMBLER__ automatically when
> preprocessing assembler-with-cpp files, there is no need to change
> anything on the glibc side.  The places that define __ASSEMBLY__ for
> that purpose will just become redundant.

 Only as from GCC commit f8f769ea4e69; don't we care to support older GCC 
versions with installed headers anymore?

 We do have places across our code base that still care about GCC 2.95 and 
older, and I can't recall any discussion about removing support for older 
compilers.  And neither I can find any #error statement triggering for any 
GCC version check, either in <features.h>, preferably, or elsewhere.

  Maciej