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runtime/cgo: -Werror=sign-compare prevents cross-compilation to Windows #27186

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BenLubar opened this issue Aug 23, 2018 · 1 comment
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runtime/cgo: -Werror=sign-compare prevents cross-compilation to Windows #27186

BenLubar opened this issue Aug 23, 2018 · 1 comment
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.12

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@BenLubar
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Please answer these questions before submitting your issue. Thanks!

What did you do?

Compile a package that uses cgo with GOOS=windows set.

For example:

cat > foo.go <<EOF
package main
  
import "C"

func main() {
}
EOF

GOOS=windows go build foo.go

What did you expect to see?

No output, an exe file is produced.

What did you see instead?

# runtime/cgo
gcc_libinit_windows.c: In function ‘void x_cgo_sys_thread_create(void (*)(void*), void*)’:
gcc_libinit_windows.c:57:13: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
  if(thandle == -1) {
     ~~~~~~~~^~~~~
cc1plus: all warnings being treated as errors

System details

go version go1.10.3 linux/amd64
GOARCH="amd64"
GOBIN="/home/ben/go/bin"
GOCACHE="/home/ben/.cache/go-build"
GOEXE=".exe"
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="windows"
GOPATH="/home/ben/.golang-path:/home/ben/go"
GORACE=""
GOROOT="/home/ben/.gimme/versions/go1.10.3.linux.amd64"
GOTMPDIR=""
GOTOOLDIR="/home/ben/.gimme/versions/go1.10.3.linux.amd64/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="x86_64-w64-mingw32-g++"
CXX="x86_64-w64-mingw32-g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build105141075=/tmp/go-build -gno-record-gcc-switches"
GOROOT/bin/go version: go version go1.10.3 linux/amd64
GOROOT/bin/go tool compile -V: compile version go1.10.3
uname -sr: Linux 4.15.0-32-generic
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.1 LTS
Release:        18.04
Codename:       bionic
/lib/x86_64-linux-gnu/libc.so.6: GNU C Library (Ubuntu GLIBC 2.27-3ubuntu1) stable release version 2.27.
gdb --version: GNU gdb (Ubuntu 8.1-0ubuntu3) 8.1.0.20180409-git
x86_64-w64-mingw32-gcc (GCC) 7.3-posix 20180312
x86_64-w64-mingw32-g++ (GCC) 7.3-posix 20180312
@ianlancetaylor ianlancetaylor added the NeedsFix The path to resolution is known, but the work has not been done. label Aug 23, 2018
@ianlancetaylor ianlancetaylor added this to the Go1.12 milestone Aug 23, 2018
@BenLubar
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Ah, it appears I accidentally set the C compiler to g++. It works with the C compiler set to gcc.

@golang golang locked and limited conversation to collaborators Aug 30, 2019
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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Milestone
Go1.12
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@ianlancetaylor @BenLubar @gopherbot