ipp-usb go compilation (libusb cgo data types mismatch)

[qo0op]

Hi,

I was able to create Yocto recipe for ipp-usb cross-compilation, but I hit issue with data types used in 'usbio_libusb.go', e.g. 'cannot use _Ctype_ushort(iface.addr.Num) (type _Ctype_ushort) as type _Ctype_uint16_t in argument to func literal'.

I was able to fix it with patch changing the data type, e.g.

--- a/github.com/OpenPrinting/ipp-usb/usbio_libusb.go
+++ b/github.com/OpenPrinting/ipp-usb/usbio_libusb.go
@@ -619,7 +619,7 @@ func (iface *UsbInterface) SoftReset() error {
                C.LIBUSB_REQUEST_TYPE_CLASS|
                        C.LIBUSB_ENDPOINT_OUT|
                        C.LIBUSB_RECIPIENT_OTHER,
-               2, 0, C.ushort(iface.addr.Num), nil, 0, 5000)
+               2, 0, C.uint16_t(iface.addr.Num), nil, 0, 5000)

        if rc < 0 {
                rc = C.libusb_control_transfer(
...

The compilation is successful and ipp-usb is working. I'm new to "go compilation", so I would like to know if it's safe and if you have any idea why this happened?

bitbake_ipp-usb_log.txt

arm-tst-linux-gnueabi-gcc -I . -march=armv7-a -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 --sysroot=/workroot/OSBuildConfig/build/tmp-glibc/sysroots/ -fPIC -marm -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -o $WORK/github.com/OpenPrinting/ipp-usb/_obj/_all.o $WORK/github.com/OpenPrinting/ipp-usb/_obj/_cgo_export.o $WORK/github.com/OpenPrinting/ipp-usb/_obj/daemon.cgo2.o $WORK/github.com/OpenPrinting/ipp-usb/_obj/dnssd_avahi.cgo2.o $WORK/github.com/OpenPrinting/ipp-usb/_obj/logger_unix.cgo2.o $WORK/github.com/OpenPrinting/ipp-usb/_obj/usbio_libusb.cgo2.o -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -Wl,-r -nostdlib -Wl,--build-id=none
| /workroot/OSBuildConfig/build/tmp-glibc/sysroots/x86_64-linux/usr/lib/arm-tst-linux-gnueabi/go/pkg/tool/linux_amd64/compile -o $WORK/github.com/OpenPrinting/ipp-usb.a -trimpath $WORK -goversion go1.9.2 -p main -buildid 3f4404f4b37f7dc929a8bc9851b372ef31c8d5ce -D _/workroot/OSBuildConfig/build/tmp-glibc/work/cortexa9hf-neon-tst-linux-gnueabi/ipp-usb/0.9.19-r0/build/src/github.com/OpenPrinting/ipp-usb -I $WORK -I /workroot/OSBuildConfig/build/tmp-glibc/work/cortexa9hf-neon-tst-linux-gnueabi/ipp-usb/0.9.19-r0/build/pkg/linux_arm -pack ./conf.go ./const.go ./device.go ./devstate.go ./dnssd.go ./err.go ./escl.go ./flock_unix.go ./glob.go ./http.go ./inifile.go ./ipp.go ./linewriter.go ./listener.go ./logger.go ./loopback.go ./main.go ./paper.go ./paths.go ./pnp.go ./quirks.go ./usbcommon.go ./usbtransport.go ./uuid.go $WORK/github.com/OpenPrinting/ipp-usb/_obj/_cgo_gotypes.go $WORK/github.com/OpenPrinting/ipp-usb/_obj/daemon.cgo1.go $WORK/github.com/OpenPrinting/ipp-usb/_obj/dnssd_avahi.cgo1.go $WORK/github.com/OpenPrinting/ipp-usb/_obj/logger_unix.cgo1.go $WORK/github.com/OpenPrinting/ipp-usb/_obj/usbio_libusb.cgo1.go $WORK/github.com/OpenPrinting/ipp-usb/_obj/_cgo_import.go
| # github.com/OpenPrinting/ipp-usb
| src/github.com/OpenPrinting/ipp-usb/usbio_libusb.go:572[/workroot/OSBuildConfig/build/tmp-glibc/work/cortexa9hf-neon-tst-linux-gnueabi/ipp-usb/0.9.19-r0/go-tmp/go-build234844427/github.com/OpenPrinting/ipp-usb/_obj/usbio_libusb.cgo1.go:755:22]: cannot use _Ctype_ushort(iface.addr.Num) (type _Ctype_ushort) as type _Ctype_uint16_t in argument to func literal
| src/github.com/OpenPrinting/ipp-usb/usbio_libusb.go:580[/workroot/OSBuildConfig/build/tmp-glibc/work/cortexa9hf-neon-tst-linux-gnueabi/ipp-usb/0.9.19-r0/go-tmp/go-build234844427/github.com/OpenPrinting/ipp-usb/_obj/usbio_libusb.cgo1.go:769:23]: cannot use _Ctype_ushort(iface.addr.Num) (type _Ctype_ushort) as type _Ctype_uint16_t in argument to func literal
| src/github.com/OpenPrinting/ipp-usb/usbio_libusb.go:599[/workroot/OSBuildConfig/build/tmp-glibc/work/cortexa9hf-neon-tst-linux-gnueabi/ipp-usb/0.9.19-r0/go-tmp/go-build234844427/github.com/OpenPrinting/ipp-usb/_obj/usbio_libusb.cgo1.go:793:17]: cannot use _Ctype_uint8_t(iface.addr.Out | _Ciconst_LIBUSB_ENDPOINT_OUT) (type _Ctype_uint8_t) as type _Ctype_uchar in argument to func literal
| src/github.com/OpenPrinting/ipp-usb/usbio_libusb.go:637[/workroot/OSBuildConfig/build/tmp-glibc/work/cortexa9hf-neon-tst-linux-gnueabi/ipp-usb/0.9.19-r0/go-tmp/go-build234844427/github.com/OpenPrinting/ipp-usb/_obj/usbio_libusb.cgo1.go:828:17]: cannot use _Ctype_uint8_t(iface.addr.In | _Ciconst_LIBUSB_ENDPOINT_IN) (type _Ctype_uint8_t) as type _Ctype_uchar in argument to func literal
| src/github.com/OpenPrinting/ipp-usb/usbio_libusb.go:666[/workroot/OSBuildConfig/build/tmp-glibc/work/cortexa9hf-neon-tst-linux-gnueabi/ipp-usb/0.9.19-r0/go-tmp/go-build234844427/github.com/OpenPrinting/ipp-usb/_obj/usbio_libusb.cgo1.go:863:41]: cannot use ep (type _Ctype_uint8_t) as type _Ctype_uchar in argument to func literal

[nifrhue]

Hi,

can you share the recipe with us to reproduce the issue.
That would be great!