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cmd/go, cmd/compile: always optimize when building runtime

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When optimizations are disabled, the compiler
cannot eliminate enough write barriers to satisfy
the runtime's nowritebarrier and nowritebarrierrec
annotations.

Enforce that requirement, and for convenience,
have cmd/go elide -N when compiling the runtime.

This came up in practice for me when running
toolstash -cmp. When toolstash -cmp detected
mismatches, it recompiled with -N, which caused
runtime compilation failures.

Change-Id: Ifcdef22c725baf2c59a09470f00124361508a8f3
Reviewed-on: https://go-review.googlesource.com/38380
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2017-03-20 09:56:50 -07:00
parent a955ece6cd
commit f8b0231639
2 changed files with 21 additions and 2 deletions
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3
src/cmd/compile/internal/gc/main.go
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@ -268,6 +268,9 @@ func Main(archInit func(*Arch)) {
} else if flag_race || flag_msan {
instrumenting = true
}
if compiling_runtime && Debug['N'] != 0 {
log.Fatal("cannot disable optimizations while compiling runtime")
}
// parse -d argument
if debugstr != "" {