On Sat, 17 Apr 2021 at 10:10, Shengjing Zhu <z...@debian.org> wrote: > 1. Raise the i386 baseline to SSE2. > 2. Downgrade the Go packages to softfloat. > 3. Build all Go packages with GCCGO on i386.
We've been setting "GO386=387" since src:golang was introduced, so 2. is already the reality. :D What makes Go 1.16 complicated in this regard is that they've renamed the value to "softfloat" but the bootstrap compiler still needs it set to "387"... See also https://github.com/golang/go/issues/44500 for more details (and/or the failure in https://buildd.debian.org/status/fetch.php?pkg=golang-1.16&arch=i386&ver=1.16.3-1&stamp=1618691947&file=log). I think our "simplest" solution, since we know the buildds don't need softfloat, is what yosifkit suggests in that upstream bug (building the bootstrap compiler explicitly as a separate step, then setting GO386=softfloat for the real build). Maybe also include "sse2-support [i386]" in "Build-Depends" just to be explicit? Another "fun" upstreamism we need to be aware of is https://github.com/golang/go/issues/44505 (upgrading the bootstrap compiler to require 1.16+ for 1.18+). ♥, - Tianon 4096R / B42F 6819 007F 00F8 8E36 4FD4 036A 9C25 BF35 7DD4
