cmd/go: 1.8beta2 cross compilation fails without CGO_ENABLED=0 #18360

tsuna · 2016-12-17T09:04:34Z

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

go version go1.8beta2 darwin/amd64

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

mid-2012 MBP running macOS 10.9.5

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/tsuna/go"
GORACE=""
GOROOT="/usr/local/Cellar/go/1.8beta2/libexec"
GOTOOLDIR="/usr/local/Cellar/go/1.8beta2/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"

What did you do?

Try to cross-compile the following program

package main

import "net"

func main() {
	net.Listen("tcp", "127.0.0.1:0")
}

What did you expect to see?

$ brew switch go 1.7.4
3 links created for /usr/local/Cellar/go/1.7.4
$ GOOS=linux GOARCH=386 go build ./main.go
$ file main
main: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, not stripped

What did you see instead?

$ brew switch go 1.8beta2
3 links created for /usr/local/Cellar/go/1.8beta2
$ GOOS=linux GOARCH=386 go build ./main.go
# runtime/cgo
ld: unknown option: --build-id=none
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Additional information

Output with -x with Go 1.7.4:

$ GOOS=linux GOARCH=386 go build -x ./main.go
WORK=/var/folders/8j/3m62t7m92958kqxt9s3chtrr0000gn/T/go-build342276376
mkdir -p $WORK/command-line-arguments/_obj/
mkdir -p $WORK/command-line-arguments/_obj/exe/
cd /Users/tsuna/go/src/arista
/usr/local/Cellar/go/1.7.4/libexec/pkg/tool/darwin_amd64/compile -o $WORK/command-line-arguments.a -trimpath $WORK -p main -complete -buildid fe4cb02508eb842193f386e2b4cc9600cbc8577a -D _/Users/tsuna/go/src/arista -I $WORK -pack ./main.go
cd .
/usr/local/Cellar/go/1.7.4/libexec/pkg/tool/darwin_amd64/link -o $WORK/command-line-arguments/_obj/exe/a.out -L $WORK -extld=clang -buildmode=exe -buildid=fe4cb02508eb842193f386e2b4cc9600cbc8577a $WORK/command-line-arguments.a
mv $WORK/command-line-arguments/_obj/exe/a.out main

Output with -x with Go 1.8beta2:

$ GOOS=linux GOARCH=386 go build -x ./main.go
WORK=/var/folders/8j/3m62t7m92958kqxt9s3chtrr0000gn/T/go-build080300991
mkdir -p $WORK/runtime/cgo/_obj/
mkdir -p $WORK/runtime/
cd /usr/local/Cellar/go/1.8beta2/libexec/src/runtime/cgo
CGO_LDFLAGS="-g" "-O2" "-lpthread" /usr/local/Cellar/go/1.8beta2/libexec/pkg/tool/darwin_amd64/cgo -objdir $WORK/runtime/cgo/_obj/ -importpath runtime/cgo -import_runtime_cgo=false -import_syscall=false -- -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror cgo.go
cd $WORK
clang -fdebug-prefix-map=a=b -c trivial.c
clang -gno-record-gcc-switches -c trivial.c
cd /usr/local/Cellar/go/1.8beta2/libexec/src/runtime/cgo
clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/_cgo_export.o -c $WORK/runtime/cgo/_obj/_cgo_export.c
clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/cgo.cgo2.o -c $WORK/runtime/cgo/_obj/cgo.cgo2.c
clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_context.o -c ./gcc_context.c
clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_fatalf.o -c ./gcc_fatalf.c
clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_libinit.o -c ./gcc_libinit.c
clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_linux_386.o -c ./gcc_linux_386.c
clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_setenv.o -c ./gcc_setenv.c
clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_traceback.o -c ./gcc_traceback.c
clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_util.o -c ./gcc_util.c
clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_386.o -c ./gcc_386.S
clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/_cgo_main.o -c $WORK/runtime/cgo/_obj/_cgo_main.c
clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -o $WORK/runtime/cgo/_obj/_cgo_.o $WORK/runtime/cgo/_obj/_cgo_main.o $WORK/runtime/cgo/_obj/_cgo_export.o $WORK/runtime/cgo/_obj/cgo.cgo2.o $WORK/runtime/cgo/_obj/gcc_context.o $WORK/runtime/cgo/_obj/gcc_fatalf.o $WORK/runtime/cgo/_obj/gcc_libinit.o $WORK/runtime/cgo/_obj/gcc_linux_386.o $WORK/runtime/cgo/_obj/gcc_setenv.o $WORK/runtime/cgo/_obj/gcc_traceback.o $WORK/runtime/cgo/_obj/gcc_util.o $WORK/runtime/cgo/_obj/gcc_386.o -g -O2 -lpthread
/usr/local/Cellar/go/1.8beta2/libexec/pkg/tool/darwin_amd64/cgo -dynpackage cgo -dynimport $WORK/runtime/cgo/_obj/_cgo_.o -dynout $WORK/runtime/cgo/_obj/_cgo_import.go -dynlinker
cd $WORK
clang -no-pie -c trivial.c
cd /usr/local/Cellar/go/1.8beta2/libexec/src/runtime/cgo
clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -o $WORK/runtime/cgo/_obj/_all.o $WORK/runtime/cgo/_obj/_cgo_export.o $WORK/runtime/cgo/_obj/cgo.cgo2.o $WORK/runtime/cgo/_obj/gcc_context.o $WORK/runtime/cgo/_obj/gcc_fatalf.o $WORK/runtime/cgo/_obj/gcc_libinit.o $WORK/runtime/cgo/_obj/gcc_linux_386.o $WORK/runtime/cgo/_obj/gcc_setenv.o $WORK/runtime/cgo/_obj/gcc_traceback.o $WORK/runtime/cgo/_obj/gcc_util.o $WORK/runtime/cgo/_obj/gcc_386.o -g -O2 -Wl,-r -nostdlib -Wl,--build-id=none
# runtime/cgo
ld: unknown option: --build-id=none
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Output with -x with Go 1.8beta2 with CGO_ENABLED=0:

$ CGO_ENABLED=0 GOOS=linux GOARCH=386 go build -x ./main.go
WORK=/var/folders/8j/3m62t7m92958kqxt9s3chtrr0000gn/T/go-build902542865
mkdir -p $WORK/net/_obj/
mkdir -p $WORK/
cd /usr/local/Cellar/go/1.8beta2/libexec/src/net
/usr/local/Cellar/go/1.8beta2/libexec/pkg/tool/darwin_amd64/compile -o $WORK/net.a -trimpath $WORK -p net -buildid faa57ce85e83a4bd8e6d6a838952d59be1a0d72c -D _/usr/local/Cellar/go/1.8beta2/libexec/src/net -I $WORK -pack ./addrselect.go ./cgo_stub.go ./conf.go ./dial.go ./dnsclient.go ./dnsclient_unix.go ./dnsconfig_unix.go ./dnsmsg.go ./fd_mutex.go ./fd_poll_runtime.go ./fd_posix.go ./fd_unix.go ./file.go ./file_unix.go ./hook.go ./hook_cloexec.go ./hook_unix.go ./hosts.go ./interface.go ./interface_linux.go ./ip.go ./iprawsock.go ./iprawsock_posix.go ./ipsock.go ./ipsock_posix.go ./lookup.go ./lookup_unix.go ./mac.go ./net.go ./nss.go ./parse.go ./pipe.go ./port.go ./port_unix.go ./sendfile_linux.go ./sock_cloexec.go ./sock_linux.go ./sock_posix.go ./sockopt_linux.go ./sockopt_posix.go ./sockoptip_linux.go ./sockoptip_posix.go ./tcpsock.go ./tcpsock_posix.go ./tcpsockopt_posix.go ./tcpsockopt_unix.go ./udpsock.go ./udpsock_posix.go ./unixsock.go ./unixsock_posix.go ./writev_unix.go
mkdir -p $WORK/command-line-arguments/_obj/
mkdir -p $WORK/command-line-arguments/_obj/exe/
cd /Users/tsuna/go/src/arista
/usr/local/Cellar/go/1.8beta2/libexec/pkg/tool/darwin_amd64/compile -o $WORK/command-line-arguments.a -trimpath $WORK -p main -complete -buildid 75b54d4cf228f82475f968e679ea5b98632c9f49 -D _/Users/tsuna/go/src/arista -I $WORK -pack ./main.go
cd .
/usr/local/Cellar/go/1.8beta2/libexec/pkg/tool/darwin_amd64/link -o $WORK/command-line-arguments/_obj/exe/a.out -L $WORK -extld=clang -buildmode=exe -buildid=75b54d4cf228f82475f968e679ea5b98632c9f49 $WORK/command-line-arguments.a
mv $WORK/command-line-arguments/_obj/exe/a.out main

The text was updated successfully, but these errors were encountered:

davecheney · 2016-12-17T09:07:33Z

This is a bug in homebrew, they homebrew recipe author hard codes cgo to 1 at all times.

…

On Sat, 17 Dec 2016, 20:04 Benoit Sigoure ***@***.***> wrote: What version of Go are you using (go version)? go version go1.8beta2 darwin/amd64 What operating system and processor architecture are you using (go env)? mid-2012 MBP running macOS 10.9.5 GOARCH="amd64" GOBIN="" GOEXE="" GOHOSTARCH="amd64" GOHOSTOS="darwin" GOOS="darwin" GOPATH="/Users/tsuna/go" GORACE="" GOROOT="/usr/local/Cellar/go/1.8beta2/libexec" GOTOOLDIR="/usr/local/Cellar/go/1.8beta2/libexec/pkg/tool/darwin_amd64" GCCGO="gccgo" CC="clang" GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -fno-common" CXX="clang++" CGO_ENABLED="1" PKG_CONFIG="pkg-config" CGO_CFLAGS="-g -O2" CGO_CPPFLAGS="" CGO_CXXFLAGS="-g -O2" CGO_FFLAGS="-g -O2" CGO_LDFLAGS="-g -O2" What did you do? Try to cross-compile the following program package main import "net" func main() { net.Listen("tcp", "127.0.0.1:0") } What did you expect to see? $ brew switch go 1.7.4 3 links created for /usr/local/Cellar/go/1.7.4 $ GOOS=linux GOARCH=386 go build ./main.go $ file main main: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, not stripped What did you see instead? $ brew switch go 1.8beta2 3 links created for /usr/local/Cellar/go/1.8beta2 $ GOOS=linux GOARCH=386 go build ./main.go # runtime/cgo ld: unknown option: --build-id=none clang: error: linker command failed with exit code 1 (use -v to see invocation) Additional information Output with -x with Go 1.7.4: $ GOOS=linux GOARCH=386 go build -x ./main.go WORK=/var/folders/8j/3m62t7m92958kqxt9s3chtrr0000gn/T/go-build342276376 mkdir -p $WORK/command-line-arguments/_obj/ mkdir -p $WORK/command-line-arguments/_obj/exe/ cd /Users/tsuna/go/src/arista /usr/local/Cellar/go/1.7.4/libexec/pkg/tool/darwin_amd64/compile -o $WORK/command-line-arguments.a -trimpath $WORK -p main -complete -buildid fe4cb02508eb842193f386e2b4cc9600cbc8577a -D _/Users/tsuna/go/src/arista -I $WORK -pack ./main.go cd . /usr/local/Cellar/go/1.7.4/libexec/pkg/tool/darwin_amd64/link -o $WORK/command-line-arguments/_obj/exe/a.out -L $WORK -extld=clang -buildmode=exe -buildid=fe4cb02508eb842193f386e2b4cc9600cbc8577a $WORK/command-line-arguments.a mv $WORK/command-line-arguments/_obj/exe/a.out main Output with -x with Go 1.8beta2: $ GOOS=linux GOARCH=386 go build -x ./main.go WORK=/var/folders/8j/3m62t7m92958kqxt9s3chtrr0000gn/T/go-build080300991 mkdir -p $WORK/runtime/cgo/_obj/ mkdir -p $WORK/runtime/ cd /usr/local/Cellar/go/1.8beta2/libexec/src/runtime/cgo CGO_LDFLAGS="-g" "-O2" "-lpthread" /usr/local/Cellar/go/1.8beta2/libexec/pkg/tool/darwin_amd64/cgo -objdir $WORK/runtime/cgo/_obj/ -importpath runtime/cgo -import_runtime_cgo=false -import_syscall=false -- -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror cgo.go cd $WORK clang -fdebug-prefix-map=a=b -c trivial.c clang -gno-record-gcc-switches -c trivial.c cd /usr/local/Cellar/go/1.8beta2/libexec/src/runtime/cgo clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/_cgo_export.o -c $WORK/runtime/cgo/_obj/_cgo_export.c clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/cgo.cgo2.o -c $WORK/runtime/cgo/_obj/cgo.cgo2.c clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_context.o -c ./gcc_context.c clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_fatalf.o -c ./gcc_fatalf.c clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_libinit.o -c ./gcc_libinit.c clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_linux_386.o -c ./gcc_linux_386.c clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_setenv.o -c ./gcc_setenv.c clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_traceback.o -c ./gcc_traceback.c clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_util.o -c ./gcc_util.c clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/gcc_386.o -c ./gcc_386.S clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -I $WORK/runtime/cgo/_obj/ -g -O2 -Wall -Werror -o $WORK/runtime/cgo/_obj/_cgo_main.o -c $WORK/runtime/cgo/_obj/_cgo_main.c clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -o $WORK/runtime/cgo/_obj/_cgo_.o $WORK/runtime/cgo/_obj/_cgo_main.o $WORK/runtime/cgo/_obj/_cgo_export.o $WORK/runtime/cgo/_obj/cgo.cgo2.o $WORK/runtime/cgo/_obj/gcc_context.o $WORK/runtime/cgo/_obj/gcc_fatalf.o $WORK/runtime/cgo/_obj/gcc_libinit.o $WORK/runtime/cgo/_obj/gcc_linux_386.o $WORK/runtime/cgo/_obj/gcc_setenv.o $WORK/runtime/cgo/_obj/gcc_traceback.o $WORK/runtime/cgo/_obj/gcc_util.o $WORK/runtime/cgo/_obj/gcc_386.o -g -O2 -lpthread /usr/local/Cellar/go/1.8beta2/libexec/pkg/tool/darwin_amd64/cgo -dynpackage cgo -dynimport $WORK/runtime/cgo/_obj/_cgo_.o -dynout $WORK/runtime/cgo/_obj/_cgo_import.go -dynlinker cd $WORK clang -no-pie -c trivial.c cd /usr/local/Cellar/go/1.8beta2/libexec/src/runtime/cgo clang -I . -fPIC -m32 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -o $WORK/runtime/cgo/_obj/_all.o $WORK/runtime/cgo/_obj/_cgo_export.o $WORK/runtime/cgo/_obj/cgo.cgo2.o $WORK/runtime/cgo/_obj/gcc_context.o $WORK/runtime/cgo/_obj/gcc_fatalf.o $WORK/runtime/cgo/_obj/gcc_libinit.o $WORK/runtime/cgo/_obj/gcc_linux_386.o $WORK/runtime/cgo/_obj/gcc_setenv.o $WORK/runtime/cgo/_obj/gcc_traceback.o $WORK/runtime/cgo/_obj/gcc_util.o $WORK/runtime/cgo/_obj/gcc_386.o -g -O2 -Wl,-r -nostdlib -Wl,--build-id=none # runtime/cgo ld: unknown option: --build-id=none clang: error: linker command failed with exit code 1 (use -v to see invocation) Output with -x with Go 1.8beta2 with CGO_ENABLED=0: $ CGO_ENABLED=0 GOOS=linux GOARCH=386 go build -x ./main.go WORK=/var/folders/8j/3m62t7m92958kqxt9s3chtrr0000gn/T/go-build902542865 mkdir -p $WORK/net/_obj/ mkdir -p $WORK/ cd /usr/local/Cellar/go/1.8beta2/libexec/src/net /usr/local/Cellar/go/1.8beta2/libexec/pkg/tool/darwin_amd64/compile -o $WORK/net.a -trimpath $WORK -p net -buildid faa57ce85e83a4bd8e6d6a838952d59be1a0d72c -D _/usr/local/Cellar/go/1.8beta2/libexec/src/net -I $WORK -pack ./addrselect.go ./cgo_stub.go ./conf.go ./dial.go ./dnsclient.go ./dnsclient_unix.go ./dnsconfig_unix.go ./dnsmsg.go ./fd_mutex.go ./fd_poll_runtime.go ./fd_posix.go ./fd_unix.go ./file.go ./file_unix.go ./hook.go ./hook_cloexec.go ./hook_unix.go ./hosts.go ./interface.go ./interface_linux.go ./ip.go ./iprawsock.go ./iprawsock_posix.go ./ipsock.go ./ipsock_posix.go ./lookup.go ./lookup_unix.go ./mac.go ./net.go ./nss.go ./parse.go ./pipe.go ./port.go ./port_unix.go ./sendfile_linux.go ./sock_cloexec.go ./sock_linux.go ./sock_posix.go ./sockopt_linux.go ./sockopt_posix.go ./sockoptip_linux.go ./sockoptip_posix.go ./tcpsock.go ./tcpsock_posix.go ./tcpsockopt_posix.go ./tcpsockopt_unix.go ./udpsock.go ./udpsock_posix.go ./unixsock.go ./unixsock_posix.go ./writev_unix.go mkdir -p $WORK/command-line-arguments/_obj/ mkdir -p $WORK/command-line-arguments/_obj/exe/ cd /Users/tsuna/go/src/arista /usr/local/Cellar/go/1.8beta2/libexec/pkg/tool/darwin_amd64/compile -o $WORK/command-line-arguments.a -trimpath $WORK -p main -complete -buildid 75b54d4cf228f82475f968e679ea5b98632c9f49 -D _/Users/tsuna/go/src/arista -I $WORK -pack ./main.go cd . /usr/local/Cellar/go/1.8beta2/libexec/pkg/tool/darwin_amd64/link -o $WORK/command-line-arguments/_obj/exe/a.out -L $WORK -extld=clang -buildmode=exe -buildid=75b54d4cf228f82475f968e679ea5b98632c9f49 $WORK/command-line-arguments.a mv $WORK/command-line-arguments/_obj/exe/a.out main — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#18360>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAAcAxwqvR2WZfmSRkP7B-oA6lxaks0iks5rI6WkgaJpZM4LP1tX> .

tsuna · 2016-12-17T09:10:49Z

This is my go env with 1.7.4:

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/tsuna/go"
GORACE=""
GOROOT="/usr/local/Cellar/go/1.7.4/libexec"
GOTOOLDIR="/usr/local/Cellar/go/1.7.4/libexec/pkg/tool/darwin_amd64"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"

Looking at this a bit closer, I see that the differences between 1.7.4 and 1.8beta2, I'm wondering whether this is not a packaging bug with homebrew, as it appears that now the default value of CGO_ENABLED is recorded when go itself is built (by cmd/dist/buildgo.go), and on my system I found

$ rg defaultCGO_ENABLED /usr/local/Cellar/go/1.8beta2
[...]
/usr/local/Cellar/go/1.8beta2/libexec/src/go/build/zcgo.go
5:const defaultCGO_ENABLED = "1"

This was changed in commit 0ba3c60 as part of #12808, which I just read. I'm not sure what to think, with either of these versions of Go go env shows CGO_ENABLED="1" but with Go 1.7.4 it gets turned off automatically when cross compiling, which seems to be what we want based on #5104.

tsuna · 2016-12-17T09:14:27Z

Ha, just seeing your reply @davecheney, looks like we're coming to the same conclusion. So was this working by chance with homebrew with earlier versions of Go, because CGO_ENABLED wasn't sticky before?

Are we really saying "if you want to cross-compile, you should build Go itself with CGO_ENABLED=0 or, at the time you cross-compile, build with CGO_ENABLED=0"?

davecheney · 2016-12-17T09:17:00Z

Nope. The go tool does the right thing, cgo is disabled when the host and target do not match. The current suspicion is homebrew have altered this behaviour.

…

On Sat, 17 Dec 2016, 20:14 Benoit Sigoure ***@***.***> wrote: Ha, just seeing your reply @davecheney <https://github.com/davecheney>, looks like we're coming to the same conclusion. So was this working by chance with homebrew with earlier versions of Go, because CGO_ENABLED wasn't sticky before? Are we really saying "if you want to cross-compile, you should build Go itself with CGO_ENABLED=0 *or*, at the time you cross-compile, build with CGO_ENABLED=0"? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#18360 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAAcA2f-T8nbeQ8TLjxl7YrKaipFR-CIks5rI6f0gaJpZM4LP1tX> .

tsuna · 2016-12-17T09:23:17Z

I'm not sure I follow now... But homebrew didn't change how it builds Go between 1.7.4 and 1.8beta2. See https://github.com/Homebrew/homebrew-core/commits/master/Formula/go.rb – the formula has been building Go with CGO_ENABLED=1 in the environment by default for a long time.

minux · 2016-12-17T09:26:35Z

I think the Homebrew maintainers confused about when it's necessary to set CGO_ENABLED: It's almost never necessary to set CGO_ENABLED when doing native compile. (You only need to set CGO_ENABLED=0 when doing a native compile when you have working C compiler but do NOT want to use cgo.) Just don't set CGO_ENABLED, and Go should do the correct thing. CGO_ENABLED is indeed made sticky in this release to fix #12808.

tsuna · 2016-12-17T09:38:25Z

OK so their formula was working by chance before. What you're saying is that unless the user wants to explicitly disable cgo by building the formula with --without-cgo, the formula should not set CGO_ENABLED to any value during the build.

I tested this change to their formula and indeed things now works as intended:

--- a/Formula/go.rb
+++ b/Formula/go.rb
@@ -63,7 +63,9 @@ class Go < Formula
     cd "src" do
       ENV["GOROOT_FINAL"] = libexec
       ENV["GOOS"]         = "darwin"
-      ENV["CGO_ENABLED"]  = build.with?("cgo") ? "1" : "0"
+      if build.without? "cgo"
+        ENV["CGO_ENABLED"] = "0"
+      end
       system "./make.bash", "--no-clean"
     end

I'll send them a pull request. Thanks for the quick response!

tsuna closed this as completed Dec 17, 2016

This was referenced Dec 17, 2016

go: Fix cross-compilation. Homebrew/homebrew-core#7962

Closed

go: Remove broken CGO_ENABLED options Homebrew/homebrew-core#7556

Closed

bradfitz mentioned this issue Dec 17, 2016

doc: mention that CGO_ENABLED is now sticky in 1.8 #18363

Closed

golang locked and limited conversation to collaborators Dec 17, 2017

gopherbot added the FrozenDueToAge label Dec 17, 2017

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cmd/go: 1.8beta2 cross compilation fails without CGO_ENABLED=0 #18360

cmd/go: 1.8beta2 cross compilation fails without CGO_ENABLED=0 #18360

tsuna commented Dec 17, 2016

davecheney commented Dec 17, 2016 via email

tsuna commented Dec 17, 2016

tsuna commented Dec 17, 2016

davecheney commented Dec 17, 2016 via email

tsuna commented Dec 17, 2016

minux commented Dec 17, 2016 via email

tsuna commented Dec 17, 2016

cmd/go: 1.8beta2 cross compilation fails without CGO_ENABLED=0 #18360

cmd/go: 1.8beta2 cross compilation fails without CGO_ENABLED=0 #18360

Comments

tsuna commented Dec 17, 2016

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

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

What did you do?

What did you expect to see?

What did you see instead?

Additional information

davecheney commented Dec 17, 2016 via email

tsuna commented Dec 17, 2016

tsuna commented Dec 17, 2016

davecheney commented Dec 17, 2016 via email

tsuna commented Dec 17, 2016

minux commented Dec 17, 2016 via email

tsuna commented Dec 17, 2016

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

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