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Date: Sun, 25 Feb 2024 21:17:50 -0500
From: Rich Felker <dalias@...c.org>
To: Jules Maselbas <jmaselbas@...v.net>
Cc: musl@...ts.openwall.com
Subject: Re: [PATCH v2] prevent from redefining __STDC_UTF_{16,32}__
macros
On Thu, Jan 25, 2024 at 03:14:40PM +0100, Jules Maselbas wrote:
> Undefine any previous __STDC_UTF_{16,32}__ macros before defining
> them to prenvent any warnings of redefining macros.
>
> ---
> v2:
> - changed `#if !define(...)` guard to `#undef`, as suggested by Rich Felker
>
> 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 | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/include/stdc-predef.h b/include/stdc-predef.h
> index af1a2799..5ccd884d 100644
> --- a/include/stdc-predef.h
> +++ b/include/stdc-predef.h
> @@ -7,7 +7,10 @@
> #define __STDC_IEC_559__ 1
> #endif
>
> +#undef __STDC_UTF_16__
> #define __STDC_UTF_16__ 1
> +
> +#undef __STDC_UTF_32__
> #define __STDC_UTF_32__ 1
>
> #endif
> --
> 2.43.0
I merged this, but now gcc warns about undefining them if system
header warnings aren't suppressed. I'm not sure what the justification
is for that... *sigh*
Rich
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