gcc and double_u

[Patrick Welche <prlw1%welche.eu@localhost>]

The following appeared in gcc head:

commit 3a873c0a7bc8183de95a6103b507101a25eed413
Author: liuhongt <hongtao.liu%intel.com@localhost>
Date:   Thu May 30 14:15:48 2024 +0800

    Rename double_u with __double_u to avoid pulluting the namespace.
    
    gcc/ChangeLog:
    
            * config/i386/emmintrin.h (__double_u): Rename from double_u.
            (_mm_load_sd): Replace double_u with __double_u.
            (_mm_store_sd): Ditto.
            (_mm_loadh_pd): Ditto.
            (_mm_loadl_pd): Ditto.
            * config/i386/xmmintrin.h (__float_u): Rename from float_u.
            (_mm_load_ss): Ditto.
            (_mm_store_ss): Ditto.


This pollution avoidance achieves a direct hit with our /usr/include/math.h:

union __double_u {
        unsigned char __dummy[sizeof(double)];
        double __val;
};


What should we do?


Cheers,

Patrick