cross-compile (linux->windows) with -race failing, even with CGO_ENABLED=1

[Art Mellor]

I've been cross compiling my app for windows successfully and decided to build with the -race flag. This produced odd errors that some googling indicated was because CGO_ENABLED=0

I changed that to get a new error (-mthreads unrecognized). Relevant output (versions, command lines, etc.) is below. Not sure if this is a bug or user error. Any insights?

mke% GOOS=windows GOARCH=amd64 go install -v -race

davis/davisd

# davis/davisd

runtime/race(.text): malloc: not defined

runtime/race(.text): malloc: not defined

runtime/race(.text): malloc: not defined

runtime/race(.text): malloc: not defined

runtime/race(.text): malloc: not defined

runtime/race(.text): malloc: not defined

runtime/race(.text): Sleep: not defined

runtime/race(.text): Sleep: not defined

runtime/race(.text): malloc: not defined

runtime/race(.text): malloc: not defined

runtime/race(.text): malloc: not defined

runtime/race(.text): ExitProcess: not defined

runtime/race(.text): malloc: not defined

runtime/race(.text): malloc: not defined

runtime/race(.text): malloc: not defined

runtime/race(.text): malloc: not defined

runtime/race(.text): _errno: not defined

runtime/race(.text): GetSystemInfo: not defined

runtime/race(.text): GetCurrentProcess: not defined

runtime/race(.text): GetProcessId: not defined

runtime/race(.text): GetCurrentThreadId: not defined

/usr/local/go/pkg/tool/linux_amd64/link: too many errors

mke% CGO_ENABLED=1 GOOS=windows GOARCH=amd64 go install -v -race

runtime/cgo

# runtime/cgo

gcc: error: unrecognized command line option \u2018-mthreads\u2019

mke% go version

go version go1.5.2 linux/amd64

mke% CGO_ENABLED=1 GOOS=windows GOARCH=amd64 go install -v -race -x

WORK=/tmp/go-build282959727

runtime/cgo

mkdir -p $WORK/runtime/cgo/_obj/

mkdir -p $WORK/runtime/

cd /usr/local/go/src/runtime/cgo

CGO_LDFLAGS="-g" "-O2" "-lmsvcrt" "-lm" "-mthreads" /usr/local/go/pkg/tool/linux_amd64/cgo -objdir $WORK/runtime/cgo/_obj/ -importpath runtime/cgo -import_runtime_cgo=false -import_syscall=false -- -I $WORK/runtime/cgo/_obj/ -Wall -Werror cgo.go

gcc -I . -m64 -mthreads -fmessage-length=0 -print-libgcc-file-name

gcc -I . -m64 -mthreads -fmessage-length=0 -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

# runtime/cgo

gcc: error: unrecognized command line option \u2018-mthreads\u2019

mke% 

[James Bardin]

On Monday, December 28, 2015 at 9:37:13 AM UTC-5, Art Mellor wrote:

I've been cross compiling my app for windows successfully and decided to build with the -race flag. This produced odd errors that some googling indicated was because CGO_ENABLED=0

I changed that to get a new error (-mthreads unrecognized). Relevant output (versions, command lines, etc.) is below. Not sure if this is a bug or user error. Any insights?

You can't cross compile with CGO without a C compiler for the target OS.

If you have that setup, you can specify the cross compiler to use with CC_FOR_TARGET (or CXX_FOR_TARGET) https://golang.org/cmd/cgo/

[Art Mellor]

Duh. Thanks!