Unrecognized command-line option "-m64" when trying to cross compile from aarch64

[rtyler]

My hunch is that this might be a cargo bug, but I hope you all don't mind if I start here 😸

Basically, my main workstation is aarch64 and I'm trying to cross compile for amd64, but the following error occurs. Best I can tell it's because the GCC suite on aarch64 doesn't bother with -m64 since all binaries are emitted as 64-bit

❯ cross build -p sh-step --target x86_64-unknown-linux-gnu
   Compiling sh-step v0.1.0 (/home/tyler/source/git/otto/stdlib/sh)
error: linking with `cc` failed: exit code: 1
  |
  = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-Wl,--eh-frame-hdr" "-L" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.108slxnxl84a8h2f.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.134ziw0g7jk3p69o.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.14uiomqtlfl5nzd4.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.161xya9reg1ng3h6.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.16ktne17pgfd6e8x.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.1fxx1wkh3qncu4bm.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.1j172sjzkmsxcut7.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.1p5kxwqqbbvq4kjj.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.1x7ekt4pwko6ujje.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.25fguub22fspemta.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.26xmpfqwvm0kq268.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.2eikxo4y5y7nphs4.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.2f9tkcjb5e3a88qg.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.2h2sbuw5aii9r5df.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.2hfgb1qhj97usljb.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.2i2mbos0nhus3zja.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.2n7lvw77cv9hhwox.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.2qmt17ag37yxygcz.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.2up67yk70rvkuifs.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.2vw33jny2gzfdpa9.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.2wai0p264sb84pni.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.2zsi8ey6c119hwe5.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.30eu0ii11mfmjc3i.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.32zjml8m3a5x2t5e.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.34wdp6ckfzu1yez7.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.37qgmuqe80k6mqw6.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.3bgtyqpkpuv3b5hc.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.3c3epogj5kuqszmz.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.3hicgh1eshcmd9dy.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.3hlflkfonjsrljwd.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.3rcnpulaplwbvbww.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.409wh3cxv0tfhzg5.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.4127yxrb5b2ta31h.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.44omceh76jru58r0.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.47mzff9uisoase5f.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.485lss35sv62742k.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.48z5v59lrl70op9e.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.49v5x7n7cgbyr4li.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.4crdzj18xx6w2m9b.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.4ghl3bazzin1prh3.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.4lv0rst6r8dmsben.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.4njbl72dos2y85wh.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.4o8pq2zh4pb0gta4.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.4ocxgmndrl9dzp54.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.4osii95x85maskfv.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.4qa3tvdhwbwg5p11.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.4u8tp2k74wj52m0.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.53vjfg5uj0o6ug91.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.540cdd5lw8i6d6ox.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.56c4ypoyb9hzjh67.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.56hkobvfz0j121cb.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.58prn70r1c9st48w.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.5byqjwa8k0hzous0.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.6hcw83qysby4pp2.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.9h03wsex1r6qse1.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.9yqiahkv98acugk.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.bnlso59plo7gvyt.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.coc0elx53qqm6id.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.cpp8y39uzsi0v20.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.f3ju065rpk5fv0j.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.jrr1moqhssit1eq.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.k4jmdprdt9f5o4v.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.sn6k82fd52toxqb.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.vynfj8unwi3jgs4.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.weqdav723ecip6r.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.xqo3gberr23447n.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.xyqd9e3id1nlwc9.rcgu.o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.zxlexzx0ya8e4pl.rcgu.o" "-o" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/sh_step-003bdfd6dc5c6518.2phiuveydcfmsx12.rcgu.o" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps" "-L" "/home/tyler/source/git/otto/target/debug/deps" "-L" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/libserde_yaml-2de69749d2cf1476.rlib" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/libdtoa-ae9450c56b23718c.rlib" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/libyaml_rust-54275b068e15941f.rlib" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/liblinked_hash_map-50078dc0ecbfed11.rlib" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/libtempfile-ee94cf60552dd87e.rlib" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/librand-d8c7f71b9b517290.rlib" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/librand_chacha-6b5c410ed1728e2d.rlib" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/libppv_lite86-31eeb0e7a6bcf806.rlib" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/librand_core-34cc898fe8805933.rlib" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/libgetrandom-88bb7b545bbd0c3d.rlib" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/liblibc-899160bccb5d7c03.rlib" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/libremove_dir_all-30e13ef53f409341.rlib" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/libcfg_if-8b0ddfa83e73e110.rlib" "/home/tyler/source/git/otto/target/x86_64-unknown-linux-gnu/debug/deps/libserde-d9f7b89fa6fe089f.rlib" "-Wl,--start-group" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-cf0f33af3a901778.rlib" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-daf8c2d692e6eca4.rlib" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-24e8f97647425e48.rlib" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-85ed7d2b484c05a9.rlib" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace-89de2c581262ec09.rlib" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace_sys-3b0db98e62ed7d75.rlib" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-c60847f9a163de82.rlib" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-0bb9b63424f4fc5d.rlib" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-3f74d829e37fa40e.rlib" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-0e9d83ff06f1a7ad.rlib" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-2c8c904efaf7c40b.rlib" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-cbfb51de52131460.rlib" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-97497c26fddb7882.rlib" "-Wl,--end-group" "/home/tyler/.rustup/toolchains/stable-aarch64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-f1a9d8c443e20b5e.rlib" "-Wl,-Bdynamic" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-ldl" "-lutil"
  = note: cc: error: unrecognized command-line option '-m64'


error: aborting due to previous error

error: could not compile `sh-step`.

To learn more, run the command again with --verbose.

tyler on coconut in otto on  step-libraries [?] via 🦀 v1.46.0
❯ uname -a
Linux coconut 5.6.14-1-default #1 SMP Wed May 20 08:32:48 UTC 2020 (b0ab48a) aarch64 aarch64 aarch64 GNU/Linux

[Alexhuszagh]

We should be able to reproduce this if we use rust-cpp-hello-world cross-compiled from an ARMv8, but I simply don't have access to the hardware right now so I'll see if I can get a cloud instance to test this (somewhat difficult since Github Workflows and DigitalOcean don't seem to support ARMv8 machines).

[Alexhuszagh]

This may be fixed when we have support for other toolchains in images #817, which would allow #751 to work, so the cross-compiler can run from an aarch64unknown-linux-gnu image and cross-compile to a x86_64-unknown-linux-gnu target.

[Emilgardis]

alright! So, this issue is strange, as it's using the stable-aarch64-unknown-linux-gnu toolchain and not stable-x86_64-unknown-linux-gnu as it should have with #244, I suspect an old cross version was used (pre 0.1.15)

this does not replicate anymore, unless the wrong toolchain is used.