On Mon, 12 Apr 2021 at 13:10, John Hendry wrote: > > > Dear gcc maintainers, > > I'm trying to install gcc-10.3.0 on a 64-bit PC running Crux Linux 3.5. Make gives the error "bit_AVX512VPTINTERSECT not declared" in cpuinfo.c, line 392 or so, and then AVX512BF16 is not declared 4 lines later. > The same thing was happening with 10.2 and I don't know whether I've misconfigured something to do with 32-bit libraries for cross-compiling or whether these bits refer to features of machines more advanced. Can I switch off support for these technological advances? I couldn't see anything in help for ../configure. > The closest thing I could find on the internet was on a gentoo forum but had no acknowledgement of a problem. The patches I've seen seem to be directed to Intel developers, at least not to ordinary users trying to compile gcc. > Can you confirm that it needs a patch or suggest some files I might modify? No patch should be needed. GCC 10.2 and 10.3 have been compiled many, many times on x86_64-linux. The constant should be bit_AVX512VP2INTERSECT (not bit_AVX512VPTINTERSECT as you wrote). If the error is really what you wrote, it suggests your sources have got corrupted somehow. The bit_AVX512VP2INTERSECT constant is defined in the cpuid.h header in the same directory.
