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cmd/go: cannot write to /dev/null anymore #12407

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mpl opened this issue Aug 30, 2015 · 4 comments
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cmd/go: cannot write to /dev/null anymore #12407

mpl opened this issue Aug 30, 2015 · 4 comments
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Go1.6

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@mpl
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mpl commented Aug 30, 2015

I'm not sure it should be considered a regression, but here it is, just in case:

with go version go1.4.2 linux/amd64:

% go build -x -o /dev/null ./bar.go
WORK=/tmp/go-build940372956
mkdir -p $WORK/command-line-arguments/_obj/
mkdir -p /dev/
cd /home/mpl/src/camlistore.org
/home/mpl/go1.4/pkg/tool/linux_amd64/6g -o $WORK/command-line-arguments.a -trimpath $WORK -p command-line-arguments -complete -D _/home/mpl/src/camlistore.org -I $WORK -pack ./bar.go
cd .
/home/mpl/go1.4/pkg/tool/linux_amd64/6l -o /dev/null -L $WORK -extld=gcc $WORK/command-line-arguments.a

whereas with go version go1.5 linux/amd64:

% go build -x -o /dev/null ./bar.go
WORK=/tmp/go-build128307931
mkdir -p $WORK/command-line-arguments/_obj/
mkdir -p $WORK/command-line-arguments/_obj/exe/
cd /home/mpl/src/camlistore.org
/home/mpl/go1.5/pkg/tool/linux_amd64/compile -o $WORK/command-line-arguments.a -trimpath $WORK -p main -complete -buildid c4b06a82929758039f6ab20686e934c659cc642a -D _/home/mpl/src/camlistore.org -I $WORK -pack ./bar.go
cd .
/home/mpl/go1.5/pkg/tool/linux_amd64/link -o $WORK/command-line-arguments/_obj/exe/a.out -L $WORK -extld=gcc -buildmode=exe -buildid=c4b06a82929758039f6ab20686e934c659cc642a $WORK/command-line-arguments.a
mkdir -p /dev/
cp $WORK/command-line-arguments/_obj/exe/a.out /dev/null
go install command-line-arguments: build output "/dev/null" already exists and is not an object file
@dominikh
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It should be noted that before 1.4.2, it didn't work, either. See #4851 for reference.

@ianlancetaylor ianlancetaylor added this to the Go1.6 milestone Aug 31, 2015
@mpl
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mpl commented Aug 31, 2015

@dominikh I see, thanks.

@0xmohit
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0xmohit commented Oct 23, 2015

@dominikh FWIW, setting build output file to /dev/null works with all go versions from 1.3 through 1.4.3; doesn't work with 1.5 & 1.5.1 (not tested with earlier versions).

@gopherbot
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CL https://golang.org/cl/16585 mentions this issue.

@ntcong ntcong mentioned this issue Apr 22, 2016
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@DominoTree DominoTree mentioned this issue Aug 20, 2016
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@golang golang locked and limited conversation to collaborators Nov 4, 2016
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@dominikh @mpl @ianlancetaylor @0xmohit @gopherbot