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Date: Thu, 25 Jan 2024 09:07:25 -0500
From: Rich Felker <dalias@...c.org>
To: Jules Maselbas <jmaselbas@...v.net>
Cc: musl@...ts.openwall.com
Subject: Re: [PATCH] prevent from redefining __STDC_UTF_{16,32}__
macros
On Thu, Jan 25, 2024 at 01:09:54PM +0100, Jules Maselbas wrote:
> ---
> I encountered this "issue" trying to compile a program with the -isystem
> option to override toolchain/installed musl headers with one from source.
>
> include/stdc-predef.h | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/include/stdc-predef.h b/include/stdc-predef.h
> index af1a2799..642bad2d 100644
> --- a/include/stdc-predef.h
> +++ b/include/stdc-predef.h
> @@ -7,7 +7,12 @@
> #define __STDC_IEC_559__ 1
> #endif
>
> +#if !defined(__STDC_UTF_16__)
> #define __STDC_UTF_16__ 1
> +#endif
> +
> +#if !defined(__STDC_UTF_32__)
> #define __STDC_UTF_32__ 1
> +#endif
>
> #endif
> --
> 2.43.0
This should probably be #undef rather than #if !defined, so we ensure
that they have the correct values even if something was done to mess
them up.
I'm kinda confused how this happened though. With -isystem rather than
-I, they should still be treated as system headers immune to warnings.
But it may be a good change anyway since redefinition is disallowed by
the language.
Rich
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