>There are a few things preventing me from having a fully self hosting
>ELF environment. (only a few are critical)
>        * kernel builds fail, assembler error on ".s" files
>        * src/gnu/dist/ld/emulparams/elf_i386.sh needs ELFSIZE=32
>        * src/sys/arch/i386/stand won't build
>        * src/gnu/usr.bin/gzip/match.S doesn't link, C version works.


The last sounds like underscore-prepend  inconsistencies.
Did you define -DNO_UNDERLINE? 

The kernel problems may have the same cause. 

Does the latest <machine/asm.h> have hooks to make _C_LABEL not
prepend an underscore?  It shouldn't, for ELF.