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gollvm: invalid argument to -O flag: fast #56484

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alexanius opened this issue Oct 29, 2022 · 2 comments
Open

gollvm: invalid argument to -O flag: fast #56484

alexanius opened this issue Oct 29, 2022 · 2 comments
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FeatureRequest help wanted NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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gollvm

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@alexanius
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What version of Go are you using (go version)?

$ go version
go version go1.18 gollvm LLVM 15.0.0git 20221028 (experimental) linux/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/alex/.cache/go-build"
GOENV="/home/alex/.config/go/env"
GOEXE=""
GOEXPERIMENT="fieldtrack,regabiwrappers"
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/alex/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/alex/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/home/alex/test/gollvm/install"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/home/alex/test/gollvm/install/tools"
GOVCS=""
GOVERSION="go1.18 gollvm LLVM 15.0.0git 20221028 (experimental)"
GCCGO="/home/alex/test/gollvm/install/bin/llvm-goc"
GOAMD64="v1"
AR="ar"
CC="/usr/bin/cc"
CXX="/usr/bin/c++"
CGO_ENABLED="1"
GOMOD="/home/alex/test/go/test/bench/go1/go.mod"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build712666364=/tmp/go-build -gno-record-gcc-switches -funwind-tables"

What did you do?

$ go build -gccgoflags="-Ofast"
/home/alex/test/gollvm/install/bin/llvm-goc: invalid argument to -O flag: fast

What did you expect to see?

Successful build

What did you see instead?

Error

Is there any reason why gollvm does not support -Ofast optimization level? For example the gccgo works fine with this option. If there is no reason I can add a support of this feature.
@ianlancetaylor
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CC @thanm

@ianlancetaylor ianlancetaylor added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Oct 29, 2022
@ianlancetaylor ianlancetaylor added this to the gollvm milestone Oct 29, 2022
@thanm
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thanm commented Oct 31, 2022

@alexanius patch welcome, the main reason this isn't supported is that nobody has expressed a need. I would imagine that it wouldn't be too much effort.

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@alexanius @ianlancetaylor @thanm @cherrymui