Error cross-compiling for windows/386 using xgo

[jonbretman]

Not sure if this is a robotgo issue or an xgo issue but asking here just in case anyone can shine a light on what is going on.

Please see this xgo issue for info - karalabe/xgo#123

[vcaesar]

I will test this tool when I have time.

[jonbretman]

@vcaesar interestingly I ended up trying to build build my app on a Windows machine and got the same error:

In file included from ./bitmap/../base/str_io_c.h:2:0,
                 from ./bitmap/goBitmap.h:27,
                 from vendor/github.com/go-vgo/robotgo/robotgo.go:45:
./bitmap/../base/zlib_util_c.h:2:18: fatal error: zlib.h: No such file or directory

That was just go build and it's a 64 bit machine but when I tried to build with GOARCH=386 I got a different error, something about internalActive being undefined on this line https://github.com/go-vgo/robotgo/blob/master/robotgo_mac_win.go#L13.

[vcaesar]

If you just want to compile from windows to 32bit, please set cgo=1:

SET CGO_ENABLED=1
SET GOARCH=386
go build main.go

[virtuald]

To get GOARCH=386 to compile from Ubuntu 16, I had to add the following to the top of zlib_util_c.h:

#if defined(IS_WINDOWS)
	#if defined (__x86_64__)
		#include "../cdeps/win64/zlib.h"
	#else
		#include "../cdeps/win32/zlib.h"
	#endif
#else
	#include <zlib.h>
#endif

Unfortunately, now there's a linker error where it can't find libz.

[iwex]

Same issue. Ubuntu 16.04. I have zlib1g-dev installed

[iwex]

I've tried @virtuald code and I got

/usr/bin/x86_64-w64-mingw32-ld: cannot find -lz
collect2: error: ld returned 1 exit status
# github.com/go-vgo/robotgo
../../go-vgo/robotgo/window/window.h: In function ‘get_title_by_hand’:
cc1: warning: function may return address of local variable [-Wreturn-local-addr]
In file included from ../../go-vgo/robotgo/window/goWindow.h:12:0,
                 from ../../go-vgo/robotgo/robotgo.go:49:
../../go-vgo/robotgo/window/window.h:604:31: note: declared here
 char* get_title_by_hand(MData m_data){
                               ^

[vcaesar]

I will test it on Ubuntu 14.04.

[kongfei605]

same proble with macos
os version:10.13.6 ,
golang version: 1.11.2.

add one line to resove problem "cannot find zlib.h"
38 #cgo windows CFLAGS: -I${SRCDIR}/cdeps/win64 // added to resove problem "cannot find zlib.h"
39 #cgo windows LDFLAGS: -lgdi32 -luser32
40 #cgo windows,amd64 LDFLAGS: -L${SRCDIR}/cdeps/win64 -lpng -lz

then ,it can't find libz. can anyone add libz.a to cdeps/win64 ?

i add two version of libz.a, but it does not work.

[kongfei605]

same proble with macos
os version:10.13.6 ,
golang version: 1.11.2.

add one line to resove problem "cannot find zlib.h"
38 #cgo windows CFLAGS: -I${SRCDIR}/cdeps/win64 // added to resove problem "cannot find zlib.h"
39 #cgo windows LDFLAGS: -lgdi32 -luser32
40 #cgo windows,amd64 LDFLAGS: -L${SRCDIR}/cdeps/win64 -lpng -lz

then ,it can't find libz. can anyone add libz.a to cdeps/win64 ?

i add two version of libz.a, but it does not work.

replace zlib.h zconf.h and add libz.a to cdeps/win64 with the same version, this problem sovled.

[vcaesar]

Please check your environment configuration.

[xen0bit]

For anyone looking to cross compile from Ubuntu 18.04 to Windows using Mingw64 and still getting the zlib.h error.

sudo apt install libz-mingw-w64-dev

GOOS=windows GOARCH=amd64 CGO_ENABLED=1 CC=x86_64-w64-mingw32-gcc CXX=x86_64-w64-mingw32-g++ go build -x ./