[PATCH] libstdc++: Add more badnames

[Jakub Jelinek]

On Thu, May 28, 2026 at 06:11:50PM +0800, Zephyr Lykos wrote:
> libstdc++-v3/ChangeLog:
> 
>     * testsuite/17_intro/badnames.cc: Add Microsoft extensions to the list.
>     * testsuite/17_intro/badnames.cc: Add more BSD extensions.
>     * testsuite/17_intro/badnames.cc: Add extensions from Newlib.

This should have been posted to libstdc++ mailing list.
WHen you do more changes in one file, all should be listed in the same
	* filename: 
entry.

You need to decide on https://gcc.gnu.org/contribute.html#legal

More importantly, this shouldn't be applied before the actual violations
of this (i.e. the __in and __out identifiers in libstdc++ headers) are
renamed to something else.

Has it been actually tested?

> +#define __lzcnt16					__lzcnt16 is a BADNAME
> +#define __lzcnt64					__lzcnt64 is a BADNAME
> +#define _mm_cvtsi64x_ss					_mm_cvtsi64x_ss is a BADNAME
> +#define _mm_cvtss_si64x					_mm_cvtss_si64x is a BADNAME
> +#define _mm_cvttss_si64x				_mm_cvttss_si64x is a BADNAME
> +#define _mm_extract_si64				_mm_extract_si64 is a BADNAME
> +#define _mm_extracti_si64				_mm_extracti_si64 is a BADNAME
> +#define _mm_insert_si64					_mm_insert_si64 is a BADNAME
> +#define _mm_inserti_si64				_mm_inserti_si64 is a BADNAME
> +#define _mm_stream_sd					_mm_stream_sd is a BADNAME
> +#define _mm_stream_si64x				_mm_stream_si64x is a BADNAME
> +#define _mm_stream_ss					_mm_stream_ss is a BADNAME
> +#define __popcnt16					__popcnt16 is a BADNAME
> +#define __popcnt64					__popcnt64 is a BADNAME
> +#define __rdtsc						__rdtsc is a BADNAME
> +#define __rdtscp					__rdtscp is a BADNAME

At least some of the above are standard x86 intrinsics, defined/used in
<x86intrin.h> or headers it includes and those are included by libstdc++
headers, so it is unclear how this can work at all.

Of course, unlike this test, the plugin will probably be ok, one can use
__lzcnt16 or _mm_cvtss_si64x etc. in the headers, but one shouldn't name
function/template arguments, automatic variables etc. like that.

	Jakub