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. Alex >Received on Mon Sep 21 2020 - 05:43:05 UTC
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