The test lib/tsan/rtl/CMakeFiles/GotsanRuntimeCheck uses /tmp instead of $T (usually /var/tmp/portage/sys-libs/compiler-rt-sanitizers-14.0.6/temp/). I noticed this, since my test failed because I've mounted /tmp with noexec. I expect portage to use /var/tmp/portage for all its needs and not also pollute /tmp. Adding the following snippet in src_prepare() works for me: # The GotsanRuntimeCheck test is executed in /tmp which might be # mounted with 'noexec'. Modify the tmp dir to be ${T} instead of /tmp sed -i -e "s|mktemp -qd /tmp/gotsan.XXXXXXXXXX|mktemp -qd --tmpdir='${T}' gotsan.XXXXXXXXXX|" \ lib/tsan/go/buildgo.sh || die
This might have been deliberate because of path length, but I still agree with your point.
> This might have been deliberate because of path length If it helps: I had no trouble when compiling it in $T which was /var/tmp/portage/sys-libs/compiler-rt-sanitizers-xx.y.z/temp/
