self-hosting on small-ish i386 boxen?

["John D. Baker" <jdbaker%consolidated.net@localhost>]

The combination of LLVM 10.0 and GCC 8 on i386 makes self-hosting on at
least one i386 machine challenging.

This is a Thinkpad T42 w/2GB RAM and 2GB swap partition.  It runs an
up-to-date 9.0_BETA (self-hosted build).

Up until the switch to GCC 8, it was able to build -current without any
problems.  After the switch to GCC 8, there seems to be quite the shortage
of memory.  Linking "gallium" is the most intensive operation.  I've
been getting:

[...]
/d0/build/current/tools/i386/lib/gcc/i486--netbsdelf/8.3.0/../../../../i486--netbsdelf/bin/ld: failed to set dynamic section sizes: memory exhausted
collect2: error: ld returned 1 exit status
*** [gallium_dri.so.0.link] Error code 1
nbmake[7]: stopped in /d0/nbsd/current/src/external/mit/xorg/lib/gallium
1 error
nbmake[7]: stopped in /d0/nbsd/current/src/external/mit/xorg/lib/gallium
*** [dependall] Error code 2
nbmake[6]: stopped in /d0/nbsd/current/src/external/mit/xorg/lib/gallium
1 error

nbmake[6]: stopped in /d0/nbsd/current/src/external/mit/xorg/lib/gallium
*** Failed target:  dependall-gallium
*** Failed command: _makedirtarget() { dir="$1"; shift; target="$1"; shift; case "${dir}" in /*) this="${dir}/"; real="${dir}" ;; .) this="external/mit/xorg/lib/"; real="/d0/nbsd/current/src/external/mit/xorg/lib" ;; *) this="external/mit/xorg/lib/${dir}/"; real="/d0/nbsd/current/src/external/mit/xorg/lib/${dir}" ;; esac; show=${this:-.}; echo "${target} ===> ${show%/}${1:+ (with: $@)}"; cd "${real}" && /d0/build/current/tools/i386/bin/nbmake _THISDIR_="${this}" "$@" ${target}; }; _makedirtarget gallium dependall
*** Error code 2
Stop.


Adding additional swap via a swap file (up to 12GB now) has not worked.

Meanwhile, 4GB of RAM (w/4GB swap) on an amd64 host appears to be
sufficient for building -current (for now).

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