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Date: Wed, 3 May 2023 10:43:46 -0400
From: Rich Felker <dalias@...c.org>
To: Jₑₙₛ Gustedt <jens.gustedt@...ia.fr>
Cc: musl@...ts.openwall.com
Subject: Re: patches for C23
On Wed, May 03, 2023 at 04:26:49PM +0200, Jₑₙₛ Gustedt wrote:
> Rich,
>
> on Wed, 3 May 2023 10:06:20 -0400 you (Rich Felker <dalias@...c.org>)
> wrote:
>
> > I'd rather just fix it in one place (the implementation-internal
> > header) so we don't have to worry about it.
>
> I still don't understand which header that is supposed to be.
See src/include/*.h. These headers so far mostly just declare
additional __-prefixed versions of interfaces where needed, but some
of them do additional things. For example, src/include/stdio.h does
some additional things:
- suppresses the complete definition of FILE, which conflicts with
libc-internal use where we have a real structure not a gratuitous
fake type for pre-c11 (and POSIX) conformance reasons.
- replaces the stdin/out/err macros with ones that resolve directly to
address-of the internal objects rather than pointer objects subject
to copy relocations -- this makes internal codegen a lot more
efficient for functions which implicitly use stdin/out.
Some other things I eventually intend to do in src/include/*:
- making memcpy expand to __builtin_memcpy if available, and similar
for other string functions with builtins; the few places where that
could be problem would need to #undef them.
- making calls to some functions where the interposable call overhead
is likely significant expand to direct calls to hidden aliases.
- etc.
Undefining macro definitions that are unsuitable for some reason to
the implementation-internal code in libc is another perfectly good use
for these.
Rich
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