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xylo04 opened this issue Oct 28, 2020 · 5 comments
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syscall: mksyscall.pl broken on Darwin/OS X #42241

xylo04 opened this issue Oct 28, 2020 · 5 comments
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@xylo04
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xylo04 commented Oct 28, 2020

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

$ go version
go version go1.15.3 darwin/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="/Users/chris/Library/Caches/go-build"
GOENV="/Users/chris/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/chris/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/chris/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/Cellar/go/1.15.3/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.15.3/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/chris/git/pat/go.mod"
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 -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/zt/9q4fnj295_x8c94qllxhs34w0000gn/T/go-build329619136=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

la5nta/pat#222 - attempting to update our project's dependencies, but OS X has apparently deprecated the symbol unix.SYS_IOCTL that our serial I/O library uses. The serial library uses the mksyscall.pl to generate its system calls.

git clone --branch update-deps https://github.com/xylo04/pat.git && cd pat
go get -u
./make.bash

What did you expect to see?

Building Pat v0.10.0...
Enjoy!

What did you see instead?

# github.com/albenik/go-serial/v2
../../go/pkg/mod/github.com/albenik/go-serial/v2@v2.0.0/zsyscall_darwin.go:16:27: undefined: unix.SYS_IOCTL
This was referenced Oct 28, 2020
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@ianlancetaylor ianlancetaylor changed the title mksyscall.pl broken on Darwin/OS X syscall: mksyscall.pl broken on Darwin/OS X Oct 28, 2020
@ianlancetaylor
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I don't think we ever really intended to support mksyscall.pl for use in anything other than building the syscall or golang.org/x/sys/unix packages themselves.

That said, are you passing the -darwin option?

@xylo04
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xylo04 commented Oct 28, 2020

I'm not a maintainer of https://github.com/albenik/go-serial so I'm having a tough time deciphering. However, It looks like I can regenerate their file, and passing the -darwin flag to mksyscall.pl does generate different bindings without the SYS_IOCTL naughty word. Let me see if that fixes the compile issue further up the stack.

@xylo04
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xylo04 commented Oct 28, 2020

Ok, this feels gross but it seems to be working. Does this PR look like what you'd expect to see?

@ianlancetaylor
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Personally I would recommend not running the unsupported mksyscall.pl script, and instead calling the appropriate IoctlNNN function from golang.org/x/sys/unix.

@ianlancetaylor
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Closing this issue because I don't think there is anything to do on the Go side. Please comment if you disagree.

@xylo04 xylo04 mentioned this issue Oct 28, 2020
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