re: HEADS UP: plan to switch many ports over to GCC 12 soon

[matthew green <mrg%eterna23.net@localhost>]

Rhialto writes:
> Does the assembler also get updated with this? I'm asking because I
> noticed when compiling pkgsrc package libdeflate-1.20 with gcc12 (from
> pkgsrc) that the compiler generates vpdpbusd instructions (amd64) but
> the assembler doesn't know those:
>
> [ 55%] Building C object CMakeFiles/libdeflate_static.dir/lib/crc32.c.o
> [ 58%] Building C object CMakeFiles/libdeflate_shared.dir/lib/zlib_decompress.c.o
> [ 62%] Building C object CMakeFiles/libdeflate_static.dir/lib/gzip_compress.c.o
> [ 65%] Building C object CMakeFiles/libdeflate_shared.dir/lib/crc32.c.o
> /tmp//ccZfStzB.s: Assembler messages:
> /tmp//ccZfStzB.s:1377: Error: unsupported instruction `vpdpbusd'
> /tmp//ccZfStzB.s:1379: Error: unsupported instruction `vpdpbusd'
> /tmp//ccfRuVym.s: Assembler messages:
> /tmp//ccfRuVym.s:1377: Error: unsupported instruction `vpdpbusd'
> /tmp//ccfRuVym.s:1379: Error: unsupported instruction `vpdpbusd'
> =2E.. more of the same...
>
> For building firefox, I had to pretend that __AVXVNNI__ wasn't #defined.

this is odd.  it feels like the compiler is being invoked wrongly, as
it will need some -m<opt> to enable these instructions, including by
passing down relevant options to gas.

can you get the full compile line for these files?


.mrg.