32 bit x86 support?

[Hoverbear]

We hear some folks are using 32 bit x86 machines so we should try to support that if we can.

[cole-h]

I did a few minutes of playing around and was able to get fairly far:

$ nix-shell -p glibc_multi.dev
nix-shell$ TARGET_CC=cc cargo build --target=i686-unknown-linux-gnu
[...snip...]
= note: /nix/store/178vvank67pg2ckr5ic5gmdkm3ri72f3-binutils-2.39/bin/ld: skipping incompatible /nix/store/yzjgl0h6a3qh1mby405428f16xww37h0-glibc-2.35-224/lib/libgcc_s.so.1 when searching for libgcc_s.so.1
          /nix/store/178vvank67pg2ckr5ic5gmdkm3ri72f3-binutils-2.39/bin/ld: skipping incompatible /nix/store/yzjgl0h6a3qh1mby405428f16xww37h0-glibc-2.35-224/lib/libgcc_s.so.1 when searching for libgcc_s.so.1
          /nix/store/178vvank67pg2ckr5ic5gmdkm3ri72f3-binutils-2.39/bin/ld: skipping incompatible /nix/store/sq78g74zs4sj7n1j5709g9c2pmffx1y8-gcc-11.3.0-lib/lib/libgcc_s.so.1 when searching for libgcc_s.so.1
          /nix/store/178vvank67pg2ckr5ic5gmdkm3ri72f3-binutils-2.39/bin/ld: skipping incompatible /nix/store/yzjgl0h6a3qh1mby405428f16xww37h0-glibc-2.35-224/lib/libgcc_s.so.1 when searching for libgcc_s.so.1
          /nix/store/178vvank67pg2ckr5ic5gmdkm3ri72f3-binutils-2.39/bin/ld: skipping incompatible /nix/store/sq78g74zs4sj7n1j5709g9c2pmffx1y8-gcc-11.3.0-lib/lib/libgcc_s.so.1 when searching for libgcc_s.so.1
          /nix/store/178vvank67pg2ckr5ic5gmdkm3ri72f3-binutils-2.39/bin/ld: cannot find libgcc_s.so.1: No such file or directory
          /nix/store/178vvank67pg2ckr5ic5gmdkm3ri72f3-binutils-2.39/bin/ld: skipping incompatible /nix/store/yzjgl0h6a3qh1mby405428f16xww37h0-glibc-2.35-224/lib/libgcc_s.so.1 when searching for libgcc_s.so.1
          /nix/store/178vvank67pg2ckr5ic5gmdkm3ri72f3-binutils-2.39/bin/ld: skipping incompatible /nix/store/sq78g74zs4sj7n1j5709g9c2pmffx1y8-gcc-11.3.0-lib/lib/libgcc_s.so.1 when searching for libgcc_s.so.1
          /nix/store/178vvank67pg2ckr5ic5gmdkm3ri72f3-binutils-2.39/bin/ld: skipping incompatible /nix/store/yzjgl0h6a3qh1mby405428f16xww37h0-glibc-2.35-224/lib/libgcc_s.so.1 when searching for libgcc_s.so.1
          /nix/store/178vvank67pg2ckr5ic5gmdkm3ri72f3-binutils-2.39/bin/ld: skipping incompatible /nix/store/sq78g74zs4sj7n1j5709g9c2pmffx1y8-gcc-11.3.0-lib/lib/libgcc_s.so.1 when searching for libgcc_s.so.1
          /nix/store/178vvank67pg2ckr5ic5gmdkm3ri72f3-binutils-2.39/bin/ld: skipping incompatible /nix/store/z1yw9cw97bcdfmxz5wk7j1bycw42r1mw-gcc-11.3.0/lib/gcc/x86_64-unknown-linux-gnu/11.3.0/libgcc.a when searching for -lgcc
          /nix/store/178vvank67pg2ckr5ic5gmdkm3ri72f3-binutils-2.39/bin/ld: cannot find -lgcc: No such file or directory
          collect2: error: ld returned 1 exit status

However, as you can see, linking failed. I didn't spend much more time investigating that.

glibc_multi.dev was required for ring to compile:

  /nix/store/49zl26cmymymzzh1xqahd6cp1g10l141-glibc-2.35-224-dev/include/gnu/stubs.h:7:11: fatal error: gnu/stubs-32.h: No such file or directory
      7 | # include <gnu/stubs-32.h>
        |           ^~~~~~~~~~~~~~~~

[Hoverbear]

Noting 32 bit Darwin machines are not included in planned support.