Re: [PATCH 2/2] man/man7/feature_test_macros.7: Drop _ISOC9X_SOURCE

[Alejandro Colomar <alx@kernel.org>]

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On 2026-01-27T22:46:24-0800, Mark Harris wrote:
> _ISOC9X_SOURCE was a temporary macro for use before the final name
> of the standard was known.  It became obsolete when _ISOC99_SOURCE
> was added in glibc 2.1.3 (1999), and has not been recognized since
> _ISOC11_SOURCE was added in glibc 2.16 (2012).[1]
> 
> [1] <https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=d78099052b6b>
> 
> Signed-off-by: Mark Harris <mark.hsj@gmail.com>

Patch applied.  Thanks!

Cheers,
Alex

> ---
>  man/man7/feature_test_macros.7 | 11 +----------
>  1 file changed, 1 insertion(+), 10 deletions(-)
> 
> diff --git a/man/man7/feature_test_macros.7 b/man/man7/feature_test_macros.7
> index a0c97f2c5..76d6e44cd 100644
> --- a/man/man7/feature_test_macros.7
> +++ b/man/man7/feature_test_macros.7
> @@ -333,16 +333,7 @@ .SS Feature test macros understood by glibc
>  .TP
>  .BR _ISOC99_SOURCE " (since glibc 2.1.3)"
>  Exposes declarations consistent with the ISO C99 standard.
> -.IP
> -Earlier glibc 2.1.x versions recognized an equivalent macro named
> -.B _ISOC9X_SOURCE
> -(because the C99 standard had not then been finalized).
> -Although the use of this macro is obsolete, glibc continues
> -to recognize it for backward compatibility.
> -.IP
> -Defining
> -.B _ISOC99_SOURCE
> -also exposes ISO C (1990) Amendment 1 ("C95") definitions.
> +Defining this macro also exposes ISO C (1990) Amendment 1 ("C95") definitions.
>  (The primary change in C95 was support for international character sets.)
>  .IP
>  Invoking the C compiler with the option
> -- 
> 2.52.0
> 

-- 
<https://www.alejandro-colomar.es>

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