x/sys/unix: does not support building on Solaris with gccgo

[bearx3f]

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

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/sparcv9-sun-solaris2.11/11.2.0/lto-wrapper
Target: sparcv9-sun-solaris2.11
Configured with: /usr/src/gcc/configure --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=sparcv9-sun-solaris2.11 --with-sysroot=/sysroot/sparcv9-sun-solaris2.11 --with-gnu-as --with-gnu-ld --with-static-standard-libraries --disable-documentation --disable-libgcj --disable-multilib --disable-shared --enable-stage1-languages=c --enable-languages=c,c++,go -v
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.2.0 (GCC) 

$ gccgo -v
Using built-in specs.
COLLECT_GCC=gccgo
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/sparcv9-sun-solaris2.11/11.2.0/lto-wrapper
Target: sparcv9-sun-solaris2.11
Configured with: /usr/src/gcc/configure --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=sparcv9-sun-solaris2.11 --with-sysroot=/sysroot/sparcv9-sun-solaris2.11 --with-gnu-as --with-gnu-ld --with-static-standard-libraries --disable-documentation --disable-libgcj --disable-multilib --disable-shared --enable-stage1-languages=c --enable-languages=c,c++,go -v
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.2.0 (GCC) 

$ go version
go version go1.16.3 linux/amd64

Does this issue reproduce with the latest release?

yes

latest gccgo is 11.2.0

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

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.16.3"
GCCGO="/usr/local/bin/gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/builds/app/gravitron2/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 -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build4161522405=/tmp/go-build -gno-record-gcc-switches"

What did you do?

using github.com/gin-gonic/gin
and cross compile with gccgo 11.2.0

• host amd64
• target sparcv9-sun-solaris2.11

$ go build -compiler gccgo -trimpath -gccgoflags="-O3 -Wall -s -static-libgo -Wl,-dy -lnsl -lsocket -lrt" test-xcc/cmd/test3

package main

import "github.com/gin-gonic/gin"

func main() {
	r := gin.Default()
	r.Run(":80")
}

What did you expect to see?

successfully compile without any warning or errors

What did you see instead?

go: downloading github.com/gin-gonic/gin v1.7.4
go: downloading github.com/gin-contrib/sse v0.1.0
go: downloading github.com/mattn/go-isatty v0.0.14
go: downloading gopkg.in/yaml.v2 v2.4.0
go: downloading github.com/ugorji/go v1.2.6
go: downloading github.com/go-playground/validator/v10 v10.9.0
go: downloading github.com/golang/protobuf v1.5.2
go: downloading golang.org/x/sys v0.0.0-20211025201205-69cdffdb9359
go: downloading github.com/ugorji/go/codec v1.2.6
go: downloading github.com/leodido/go-urn v1.2.1
go: downloading github.com/go-playground/universal-translator v0.18.0
go: downloading golang.org/x/crypto v0.0.0-20210921155107-089bfa567519
go: downloading golang.org/x/text v0.3.7
go: downloading google.golang.org/protobuf v1.27.1
go: downloading github.com/go-playground/locales v0.14.0
# golang.org/x/sys/unix
/go/pkg/mod/golang.org/x/sys@v0.0.0-20211025201205-69cdffdb9359/unix/gccgo_c.c: In function 'gccgoRealSyscall':
/go/pkg/mod/golang.org/x/sys@v0.0.0-20211025201205-69cdffdb9359/unix/gccgo_c.c:33:15: warning: implicit declaration of function 'syscall' [-Wimplicit-function-declaration]
   33 |         r.r = syscall(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9);
      |               ^~~~~~~

and when run

$ GIN_MODE=release ./test3
SIGSYS: bad system call
PC=0x1001f12f4 m=0 sigcode=32767

goroutine 1 [syscall]:
__sighndlr
        :0
_syscall
        :0

and sometime i got this

SIGSYS: bad system call
PC=0x0 m=0 sigcode=32767

goroutine 1 [syscall]:
syscall
        :0
golang_0org_1x_1sys_1unix.realSyscall
        /go/pkg/mod/golang.org/x/sys@v0.0.0-20211025201205-69cdffdb9359/unix/gccgo_c.c:33

[ianlancetaylor]

This doesn't seem to be a bug in gccgo itself.

The build of golang.org/x/sys/unix is getting the warning because the C file isn't including the right header file; I guess it should be including <sys/syscall.h>. The warning by itself shouldn't be a problem, though. The program then appears to crash when it calls unix.Syscall, crashing because it is trying to make a bad system call. But I don't know why the program is calling unix.Syscall; do you? Try running it under the debugger; you may get a better stack trace.

[bearx3f]

Thank you for your response

look like github.com/mattn/go-isatty is the one who call unix.Syscall

Reading symbols from ./bin/test3...
(gdb) r
Starting program: /export/home/oracle/test/bin/test3
[Thread debugging using libthread_db enabled]
[New Thread 1 (LWP 1)]
[New LWP    2        ]
[New LWP    3        ]
[New LWP    4        ]
[New LWP    5        ]
GOOS solaris
GOARCH sparc64
[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.

[GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production.
 - using env:   export GIN_MODE=release
 - using code:  gin.SetMode(gin.ReleaseMode)

[New Thread 2 (LWP 2)]
[New Thread 3        ]
[New Thread 4        ]
[New Thread 5 (LWP 5)]

Thread 2 received signal SIGSYS, Bad system call.
[Switching to Thread 1 (LWP 1)]
0xffffffff58de2d54 in syscall () from /lib/64/libc.so.1
(gdb) bt
#0  0xffffffff58de2d54 in syscall () from /lib/64/libc.so.1
#1  0x00000001001f1b04 in golang_0org_1x_1sys_1unix.realSyscall (trap=16, a1=1, a2=21505, a3=824638662240, a4=0, a5=0, a6=0, a7=0, a8=0, a9=0)
    at ./vendor/golang.org/x/sys/unix/gccgo_c.c:34
#2  0x00000001001bc0a4 in golang_0org_1x_1sys_1unix.Syscall (trap=16, a1=1, a2=21505, a3=824638662240) at fdset.go:28
#3  0x00000001001d5ce8 in golang_0org_1x_1sys_1unix.ioctl (fd=1, req=21505, arg=824638662240) at zptrace_x86_linux.go:42
#4  0x00000001001bd544 in golang_0org_1x_1sys_1unix.IoctlGetTermios (fd=1, req=21505) at ifreq_linux.go:73
#5  0x00000001000425fc in github_0com_1mattn_1go_x2disatty.IsTerminal (fd=1) at ./vendor/github.com/mattn/go-isatty/doc.go:11
#6  0x000000010001a3f8 in github_0com_1gin_x2dgonic_1gin.LoggerWithConfig (conf=...) at gin.go:220
#7  0x0000000100019ef0 in github_0com_1gin_x2dgonic_1gin.Logger () at gin.go:184
#8  0x0000000100013800 in github_0com_1gin_x2dgonic_1gin.Default () at fs.go:183
#9  0x0000000100004368 in main.main () at ./cmd/test3/main.go:13

[ianlancetaylor]

Something is wrong. A build for Solaris should not be running any code in zptrace_x86_linux.go.

When you run your go build command, try setting GOOS=solaris in the environment. That will tell the go command that you are building a cross-compiler.

[bearx3f]

I got this after when compiled with GOOS=solaris

I think GOARCH and target of gccgo (sparcv9-sun-solaris2.11) are conflicts

$ go build -compiler gccgo -o bin/$APP -trimpath -gccgoflags="-g1 -O0 -Wall -static-libgo" test-xcc/cmd/$APP
# golang.org/x/sys/unix
vendor/golang.org/x/sys/unix/zsyscall_solaris_amd64.go:171:3: error: procAccess is not a function; '//go:linkname' is only supported for functions
  171 | //go:linkname procAccess libc_access
      |   ^
vendor/golang.org/x/sys/unix/zsyscall_solaris_amd64.go:172:3: error: procAdjtime is not a function; '//go:linkname' is only supported for functions
  172 | //go:linkname procAdjtime libc_adjtime
      |   ^
vendor/golang.org/x/sys/unix/zsyscall_solaris_amd64.go:173:3: error: procChdir is not a function; '//go:linkname' is only supported for functions
  173 | //go:linkname procChdir libc_chdir
      |   ^
----- snipped (many more) -----

go env after GOOS=solaris

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="solaris"
GOPATH="/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.17.2"
GCCGO="/usr/local/bin/gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="0"
GOMOD="/builds/booboo/sparcv9-sun-solaris2.11-xcc-toolchain-test/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 -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build3649007841=/tmp/go-build -gno-record-gcc-switches"

[ianlancetaylor]

Setting GOOS to match the gccgo target is required.

What you've discovered is that golang.org/x/sys/unix does not support Solaris when using gccgo. That is a bug that needs to be addressed in golang.org/x/sys/unix.

[bearx3f]

I looking forward to this bug to be fix

Thanks