[RFC v2 1/3] cdefs: Add __bool

[Alejandro Colomar]

Hi,

On Tue, Sep 02, 2025 at 03:27:31PM +0000, Wilco Dijkstra wrote:
> Hi,
> 
> >> This seems entirely possible, given the glibc documentation requires
> >> GCC 12.1 at least.
> >> <https://sourceware.org/glibc/manual/latest/html_node/Tools-for-Compilation.html>
> >
> > That's about building glibc itself, but <sys/cdefs.h> is an installed
> > header which must support arbitrary compilers.
> 
> We still need to define "arbitrary" here. In [1] I asked a while back:
> 
> On a related note, we still have various __GNU_PREREQ (2, 4) in our headers.
> Does anyone ever test such ancient compilers/binutils still work with GLIBC?
> At which point do we consider them obsolete? Would it be reasonable to also
> set a minimum version here which trails the minimum GLIBC build compiler by
> say 5 years?
> 
> So if we could set minimum GCC version to use headers to GCC 7, we'd be able
> to get rid of a whole lot of clutter:
> 
> > grep  "__GNUC_PREREQ\s*([1-7]" -R * | wc
> 1467
> 
> That's 5000+ lines of #ifdef/else/endif alone.

+1

Plus, we already require 'long long' to exist (<stdlib.h> at least uses
freely).  When was it added to GCC?  That would help determining an
implicit version we're already requiring.


Have a lovely day!
Alex

> 
> Cheers,
> Wilco
> 
> [1] https://sourceware.org/pipermail/libc-alpha/2024-October/160713.html

-- 
<https://www.alejandro-colomar.es>
Use port 80 (that is, <...:80/>).
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