On Mon, 21 Sep 2020 at 00:43, Alexander Richardson <arichardson_at_freebsd.org> wrote: > > On Mon, 21 Sep 2020, 07:38 Adrian Chadd, <adrian_at_freebsd.org> wrote: > >> So, the big list of unknown symbols was my fault! Whoops. >> >> i've gotten further using gcc-6.4 by fixing some of the warnings/issues >> that have crept up. >> >> Here's a review for one of them: >> >> https://reviews.freebsd.org/D26504 >> >> However, now I've hit: >> >> /usr/local/bin/mips-unknown-freebsd13.0-ld: >> >> /usr/home/adrian/work/freebsd/head-embedded/obj/mips_ap/usr/home/adrian/work/freebsd/head-embedded/src/mips.mips/tmp/usr/lib/libc++.so.1: >> undefined reference to `__atomic_fetch_sub_8' >> /usr/local/bin/mips-unknown-freebsd13.0-ld: >> >> /usr/home/adrian/work/freebsd/head-embedded/obj/mips_ap/usr/home/adrian/work/freebsd/head-embedded/src/mips.mips/tmp/usr/lib/libc++.so.1: >> undefined reference to `__atomic_load_8' >> /usr/local/bin/mips-unknown-freebsd13.0-ld: >> >> /usr/home/adrian/work/freebsd/head-embedded/obj/mips_ap/usr/home/adrian/work/freebsd/head-embedded/src/mips.mips/tmp/usr/lib/libc++.so.1: >> undefined reference to `__atomic_fetch_add_8' >> >> .. looks like we need some 64 bit atomics now in mips32 for libc++ / devd >> > > Those are now provided by compiler-rt when using clang. With GCC you'll > have to link libatomic. I had a quick look at the code in libc++ that uses > the 64-bit atomics a few weeks ago and I believe it's the futex fallback > code. The best solution would probably be to port it to use umtx but for > MIPS32 it might be fine to use a 32 bit atomic instead. > It compiled fine with a 32 bit atomic. Why's it 64 bit for everything but Linux? Can we make it a 32 bit atomic for all FreeBSD platforms? Are there ABI concerns? -adrian > > Alex > >>Received on Sat Oct 03 2020 - 18:36:03 UTC
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