Re: [go-nuts] building C++ wrapper for mabain lib with go1.13
On Wed, Mar 18, 2020 at 9:59 AM Mohamed Mahmoud wrote:
>
> On Wednesday, March 18, 2020 at 11:59:38 AM UTC-4, Ian Lance Taylor wrote:
>>
>> On Wed, Mar 18, 2020 at 5:18 AM Mohamed Mahmoud wrote:
>> >
>> > On Wednesday, March 18, 2020 at 8:01:27 AM UTC-4, Mohamed Mahmoud wrote:
>> >>
>> >>
>> >>> It doesn't look like the -ldflags option is getting through to the
>> >>> linker. Try
>> >>> go build "-ldflags=all=-w -extldflags=-lmabain -v"
>> >>>
>> >>> Ian
>> >>
>> >>
>> >> I tried the new format however it still can't link mabain lib and I get
>> >> the same errors
>> >>
>> >> Step 25/26 : RUN cd ${MABAIN_SRC}/; go build -x -i "-ldflags=all=-w
>> >> -extldflags=-lmabain -v"
>> >>
>> >> ---> Running in 90e992e27f6b
>> >>
>> >> WORK=/tmp/go-build678792509
>> >>
>> >> mkdir -p $WORK/b001/
>> >>
>> >> swig -version
>> >>
>> >> cd $WORK
>> >>
>> >> /usr/local/go/pkg/tool/linux_amd64/compile -o ./b001/_go_.o -trimpath
>> >> "$WORK/b001=>" -p main -complete -goversion go1.13 -D _$WORK -c=4
>> >> ./swig_intsize.go
>> >>
>> >> cd /mabain_src
>> >>
>> >> swig -go -cgo -intgosize 64 -module mabain -o $WORK/b001/mabain_wrap.cxx
>> >> -outdir $WORK/b001/ -c++ mabain.swigcxx
>> >>
>> >> CGO_LDFLAGS='"-g" "-O2"' /usr/local/go/pkg/tool/linux_amd64/cgo -objdir
>> >> $WORK/b001/ -importpath _/mabain_src -- -I $WORK/b001/ -g -O2
>> >> $WORK/b001/_mabain_swig.go
>> >>
>> >> cd $WORK
>> >>
>> >> gcc -fno-caret-diagnostics -c -x c - -o /dev/null || true
>> >>
>> >> gcc -Qunused-arguments -c -x c - -o /dev/null || true
>> >>
>> >> gcc -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
>> >>
>> >> gcc -gno-record-gcc-switches -c -x c - -o /dev/null || true
>> >>
>> >> cd $WORK/b001
>> >>
>> >> TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
>> >> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I
>> >> ./ -g -O2 -o ./_x001.o -c _cgo_export.c
>> >>
>> >> TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
>> >> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I
>> >> ./ -g -O2 -o ./_x002.o -c _mabain_swig.cgo2.c
>> >>
>> >> cd $WORK
>> >>
>> >> g++ -fno-caret-diagnostics -c -x c - -o /dev/null || true
>> >>
>> >> g++ -Qunused-arguments -c -x c - -o /dev/null || true
>> >>
>> >> g++ -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
>> >>
>> >> g++ -gno-record-gcc-switches -c -x c - -o /dev/null || true
>> >>
>> >> cd /mabain_src
>> >>
>> >> TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
>> >> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I
>> >> $WORK/b001/ -g -O2 -o $WORK/b001/_x003.o -c mabain_c_interface.cpp
>> >>
>> >> cd $WORK/b001
>> >>
>> >> TERM='dumb' g++ -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
>> >> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I
>> >> ./ -g -O2 -o ./_x004.o -c mabain_wrap.cxx
>> >>
>> >> TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
>> >> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I
>> >> ./ -g -O2 -o ./_cgo_main.o -c _cgo_main.c
>> >>
>> >> cd /mabain_src
>> >>
>> >> TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
>> >> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -o
>> >> $WORK/b001/_cgo_.o $WORK/b001/_cgo_main.o $WORK/b001/_x001.o
>> >> $WORK/b001/_x002.o $WORK/b001/_x003.o $WORK/b001/_x004.o -g -O2
>> >>
>> >> # _/mabain_src
>> >>
>> >> /tmp/go-build678792509/b001/_x003.o: In function `mbOpen':
>> >>
>> >> ./mabain_c_interface.cpp:10: undefined reference to
>> >> `mabain::CONSTS::ReaderOptions()'
>> >
>> >
>> > root@70c73d4a4f01:/# go version
>> >
>> > go version go1.13 linux/amd64
>> >
>> > root@70c73d4a4f01:/# swig -version
>> >
>> >
>> > SWIG Version 3.0.12
>> >
>> >
>> > Compiled with g++ [x86_64-pc-linux-gnu]
>> >
>> >
>> > Configured options: +pcre
>> >
>> >
>> > Please see http://www.swig.org for reporting bugs and further information
>>
>>
>> Oh, sorry, I see now that this is failing in the cgo step, not the link step.
>>
>> Try adding this to your Go file:
>>
>> // #cgo LDFLAGS: -lmabain
>> import "C"
>>
>> Ian
>
>
> Step 25/26 : RUN cd ${MABAIN_SRC}/; go build -x "-ldflags=all=-w
> -extldflags=-lmabain -v"
>
> ---> Running in e570e7fe65fa
>
> WORK=/tmp/go-build247647361
>
> can't load package: package .: use of cgo in test /mabain_src/mabain_test.go
> not supported
>
> The command '/bin/sh -c cd ${MABAIN_SRC}/; go build -x "-ldflags=all=-w
> -extldflags=-lmabain -v"' returned a non-zero code: 1
>
> MMAHMOUD-M-45WX:golang mohamedmahmoud$ git diff mabain_test.go
>
> diff --git a/swig/golang/mabain_test.go b/swig/golang/mabain_test.go
>
> index 3b5be36..d2bc605 100644
>
> --- a/swig/golang/mabain_test.go
>
> +++ b/swig/golang/mabain_test.go
>
> @@ -1,14 +1,16 @@
>
> package mabain
>
>
>
> +// #cgo LDFLAGS: -lmabain
>
> import (
>
> + "C"
>
> "fmt"
>
> - "testing"
>
> "os"
>
> + "
Re: [go-nuts] building C++ wrapper for mabain lib with go1.13
On Wednesday, March 18, 2020 at 11:59:38 AM UTC-4, Ian Lance Taylor wrote:
>
> On Wed, Mar 18, 2020 at 5:18 AM Mohamed Mahmoud > wrote:
> >
> > On Wednesday, March 18, 2020 at 8:01:27 AM UTC-4, Mohamed Mahmoud wrote:
> >>
> >>
> >>> It doesn't look like the -ldflags option is getting through to the
> linker. Try
> >>> go build "-ldflags=all=-w -extldflags=-lmabain -v"
> >>>
> >>> Ian
> >>
> >>
> >> I tried the new format however it still can't link mabain lib and I get
> the same errors
> >>
> >> Step 25/26 : RUN cd ${MABAIN_SRC}/; go build -x -i "-ldflags=all=-w
> -extldflags=-lmabain -v"
> >>
> >> ---> Running in 90e992e27f6b
> >>
> >> WORK=/tmp/go-build678792509
> >>
> >> mkdir -p $WORK/b001/
> >>
> >> swig -version
> >>
> >> cd $WORK
> >>
> >> /usr/local/go/pkg/tool/linux_amd64/compile -o ./b001/_go_.o -trimpath
> "$WORK/b001=>" -p main -complete -goversion go1.13 -D _$WORK -c=4
> ./swig_intsize.go
> >>
> >> cd /mabain_src
> >>
> >> swig -go -cgo -intgosize 64 -module mabain -o
> $WORK/b001/mabain_wrap.cxx -outdir $WORK/b001/ -c++ mabain.swigcxx
> >>
> >> CGO_LDFLAGS='"-g" "-O2"' /usr/local/go/pkg/tool/linux_amd64/cgo -objdir
> $WORK/b001/ -importpath _/mabain_src -- -I $WORK/b001/ -g -O2
> $WORK/b001/_mabain_swig.go
> >>
> >> cd $WORK
> >>
> >> gcc -fno-caret-diagnostics -c -x c - -o /dev/null || true
> >>
> >> gcc -Qunused-arguments -c -x c - -o /dev/null || true
> >>
> >> gcc -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
> >>
> >> gcc -gno-record-gcc-switches -c -x c - -o /dev/null || true
> >>
> >> cd $WORK/b001
> >>
> >> TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
> -g -O2 -o ./_x001.o -c _cgo_export.c
> >>
> >> TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
> -g -O2 -o ./_x002.o -c _mabain_swig.cgo2.c
> >>
> >> cd $WORK
> >>
> >> g++ -fno-caret-diagnostics -c -x c - -o /dev/null || true
> >>
> >> g++ -Qunused-arguments -c -x c - -o /dev/null || true
> >>
> >> g++ -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
> >>
> >> g++ -gno-record-gcc-switches -c -x c - -o /dev/null || true
> >>
> >> cd /mabain_src
> >>
> >> TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I
> $WORK/b001/ -g -O2 -o $WORK/b001/_x003.o -c mabain_c_interface.cpp
> >>
> >> cd $WORK/b001
> >>
> >> TERM='dumb' g++ -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
> -g -O2 -o ./_x004.o -c mabain_wrap.cxx
> >>
> >> TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
> -g -O2 -o ./_cgo_main.o -c _cgo_main.c
> >>
> >> cd /mabain_src
> >>
> >> TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -o
> $WORK/b001/_cgo_.o $WORK/b001/_cgo_main.o $WORK/b001/_x001.o
> $WORK/b001/_x002.o $WORK/b001/_x003.o $WORK/b001/_x004.o -g -O2
> >>
> >> # _/mabain_src
> >>
> >> /tmp/go-build678792509/b001/_x003.o: In function `mbOpen':
> >>
> >> ./mabain_c_interface.cpp:10: undefined reference to
> `mabain::CONSTS::ReaderOptions()'
> >
> >
> > root@70c73d4a4f01:/# go version
> >
> > go version go1.13 linux/amd64
> >
> > root@70c73d4a4f01:/# swig -version
> >
> >
> > SWIG Version 3.0.12
> >
> >
> > Compiled with g++ [x86_64-pc-linux-gnu]
> >
> >
> > Configured options: +pcre
> >
> >
> > Please see http://www.swig.org for reporting bugs and further
> information
>
>
> Oh, sorry, I see now that this is failing in the cgo step, not the link
> step.
>
> Try adding this to your Go file:
>
> // #cgo LDFLAGS: -lmabain
> import "C"
>
> Ian
>
Step 25/26 : RUN cd ${MABAIN_SRC}/; go build -x "-ldflags=all=-w
-extldflags=-lmabain -v"
---> Running in e570e7fe65fa
WORK=/tmp/go-build247647361
*can't load package: package .: use of cgo in test
/mabain_src/mabain_test.go not supported*
The command '/bin/sh -c cd ${MABAIN_SRC}/; go build -x "-ldflags=all=-w
-extldflags=-lmabain -v"' returned a non-zero code: 1
MMAHMOUD-M-45WX:golang mohamedmahmoud$ git diff mabain_test.go
*diff --git a/swig/golang/mabain_test.go b/swig/golang/mabain_test.go*
*index 3b5be36..d2bc605 100644*
*--- a/swig/golang/mabain_test.go*
*+++ b/swig/golang/mabain_test.go*
@@ -1,14 +1,16 @@
package mabain
+// #cgo LDFLAGS: -lmabain
import (
+ "C"
"fmt"
- "testing"
"os"
+ "testing"
)
const (
MABAIN_PATH = "/var/tmp/mabain_test"
- COUNT = 100
+ COUNT = 100
)
I thought we can use either SWIG or CGO but not both ?
--
You received
Re: [go-nuts] building C++ wrapper for mabain lib with go1.13
On Wed, Mar 18, 2020 at 5:18 AM Mohamed Mahmoud wrote:
>
> On Wednesday, March 18, 2020 at 8:01:27 AM UTC-4, Mohamed Mahmoud wrote:
>>
>>
>>> It doesn't look like the -ldflags option is getting through to the linker.
>>> Try
>>> go build "-ldflags=all=-w -extldflags=-lmabain -v"
>>>
>>> Ian
>>
>>
>> I tried the new format however it still can't link mabain lib and I get the
>> same errors
>>
>> Step 25/26 : RUN cd ${MABAIN_SRC}/; go build -x -i "-ldflags=all=-w
>> -extldflags=-lmabain -v"
>>
>> ---> Running in 90e992e27f6b
>>
>> WORK=/tmp/go-build678792509
>>
>> mkdir -p $WORK/b001/
>>
>> swig -version
>>
>> cd $WORK
>>
>> /usr/local/go/pkg/tool/linux_amd64/compile -o ./b001/_go_.o -trimpath
>> "$WORK/b001=>" -p main -complete -goversion go1.13 -D _$WORK -c=4
>> ./swig_intsize.go
>>
>> cd /mabain_src
>>
>> swig -go -cgo -intgosize 64 -module mabain -o $WORK/b001/mabain_wrap.cxx
>> -outdir $WORK/b001/ -c++ mabain.swigcxx
>>
>> CGO_LDFLAGS='"-g" "-O2"' /usr/local/go/pkg/tool/linux_amd64/cgo -objdir
>> $WORK/b001/ -importpath _/mabain_src -- -I $WORK/b001/ -g -O2
>> $WORK/b001/_mabain_swig.go
>>
>> cd $WORK
>>
>> gcc -fno-caret-diagnostics -c -x c - -o /dev/null || true
>>
>> gcc -Qunused-arguments -c -x c - -o /dev/null || true
>>
>> gcc -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
>>
>> gcc -gno-record-gcc-switches -c -x c - -o /dev/null || true
>>
>> cd $WORK/b001
>>
>> TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
>> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
>> -g -O2 -o ./_x001.o -c _cgo_export.c
>>
>> TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
>> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
>> -g -O2 -o ./_x002.o -c _mabain_swig.cgo2.c
>>
>> cd $WORK
>>
>> g++ -fno-caret-diagnostics -c -x c - -o /dev/null || true
>>
>> g++ -Qunused-arguments -c -x c - -o /dev/null || true
>>
>> g++ -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
>>
>> g++ -gno-record-gcc-switches -c -x c - -o /dev/null || true
>>
>> cd /mabain_src
>>
>> TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
>> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I
>> $WORK/b001/ -g -O2 -o $WORK/b001/_x003.o -c mabain_c_interface.cpp
>>
>> cd $WORK/b001
>>
>> TERM='dumb' g++ -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
>> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
>> -g -O2 -o ./_x004.o -c mabain_wrap.cxx
>>
>> TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
>> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
>> -g -O2 -o ./_cgo_main.o -c _cgo_main.c
>>
>> cd /mabain_src
>>
>> TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
>> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -o
>> $WORK/b001/_cgo_.o $WORK/b001/_cgo_main.o $WORK/b001/_x001.o
>> $WORK/b001/_x002.o $WORK/b001/_x003.o $WORK/b001/_x004.o -g -O2
>>
>> # _/mabain_src
>>
>> /tmp/go-build678792509/b001/_x003.o: In function `mbOpen':
>>
>> ./mabain_c_interface.cpp:10: undefined reference to
>> `mabain::CONSTS::ReaderOptions()'
>
>
> root@70c73d4a4f01:/# go version
>
> go version go1.13 linux/amd64
>
> root@70c73d4a4f01:/# swig -version
>
>
> SWIG Version 3.0.12
>
>
> Compiled with g++ [x86_64-pc-linux-gnu]
>
>
> Configured options: +pcre
>
>
> Please see http://www.swig.org for reporting bugs and further information
Oh, sorry, I see now that this is failing in the cgo step, not the link step.
Try adding this to your Go file:
// #cgo LDFLAGS: -lmabain
import "C"
Ian
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Re: [go-nuts] building C++ wrapper for mabain lib with go1.13
On Wednesday, March 18, 2020 at 8:01:27 AM UTC-4, Mohamed Mahmoud wrote:
>
>
> It doesn't look like the -ldflags option is getting through to the linker.
>> Try
>> go build "-ldflags=all=-w -extldflags=-lmabain -v"
>>
>> Ian
>>
>
> I tried the new format however it still can't link mabain lib and I get
> the same errors
>
> Step 25/26 : RUN cd ${MABAIN_SRC}/; go build -x -i "-ldflags=all=-w
> -extldflags=-lmabain -v"
>
> ---> Running in 90e992e27f6b
>
> WORK=/tmp/go-build678792509
>
> mkdir -p $WORK/b001/
>
> swig -version
>
> cd $WORK
>
> /usr/local/go/pkg/tool/linux_amd64/compile -o ./b001/_go_.o -trimpath
> "$WORK/b001=>" -p main -complete -goversion go1.13 -D _$WORK -c=4
> ./swig_intsize.go
>
> cd /mabain_src
>
> swig -go -cgo -intgosize 64 -module mabain -o $WORK/b001/mabain_wrap.cxx
> -outdir $WORK/b001/ -c++ mabain.swigcxx
>
> CGO_LDFLAGS='"-g" "-O2"' /usr/local/go/pkg/tool/linux_amd64/cgo -objdir
> $WORK/b001/ -importpath _/mabain_src -- -I $WORK/b001/ -g -O2
> $WORK/b001/_mabain_swig.go
>
> cd $WORK
>
> gcc -fno-caret-diagnostics -c -x c - -o /dev/null || true
>
> gcc -Qunused-arguments -c -x c - -o /dev/null || true
>
> gcc -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
>
> gcc -gno-record-gcc-switches -c -x c - -o /dev/null || true
>
> cd $WORK/b001
>
> TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
> -g -O2 -o ./_x001.o -c _cgo_export.c
>
> TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
> -g -O2 -o ./_x002.o -c _mabain_swig.cgo2.c
>
> cd $WORK
>
> g++ -fno-caret-diagnostics -c -x c - -o /dev/null || true
>
> g++ -Qunused-arguments -c -x c - -o /dev/null || true
>
> g++ -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
>
> g++ -gno-record-gcc-switches -c -x c - -o /dev/null || true
>
> cd /mabain_src
>
> TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I
> $WORK/b001/ -g -O2 -o $WORK/b001/_x003.o -c mabain_c_interface.cpp
>
> cd $WORK/b001
>
> TERM='dumb' g++ -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
> -g -O2 -o ./_x004.o -c mabain_wrap.cxx
>
> TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
> -g -O2 -o ./_cgo_main.o -c _cgo_main.c
>
> cd /mabain_src
>
> TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -o
> $WORK/b001/_cgo_.o $WORK/b001/_cgo_main.o $WORK/b001/_x001.o
> $WORK/b001/_x002.o $WORK/b001/_x003.o $WORK/b001/_x004.o -g -O2
>
> # _/mabain_src
>
> /tmp/go-build678792509/b001/_x003.o: In function `mbOpen':
> ./mabain_c_interface.cpp:10: undefined reference to
> `mabain::CONSTS::ReaderOptions()'
>
root@70c73d4a4f01:/# go version
go version go1.13 linux/amd64
root@70c73d4a4f01:/# swig -version
SWIG Version 3.0.12
Compiled with g++ [x86_64-pc-linux-gnu]
Configured options: +pcre
Please see http://www.swig.org for reporting bugs and further information
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Re: [go-nuts] building C++ wrapper for mabain lib with go1.13
> It doesn't look like the -ldflags option is getting through to the linker.
> Try
> go build "-ldflags=all=-w -extldflags=-lmabain -v"
>
> Ian
>
I tried the new format however it still can't link mabain lib and I get the
same errors
Step 25/26 : RUN cd ${MABAIN_SRC}/; go build -x -i "-ldflags=all=-w
-extldflags=-lmabain -v"
---> Running in 90e992e27f6b
WORK=/tmp/go-build678792509
mkdir -p $WORK/b001/
swig -version
cd $WORK
/usr/local/go/pkg/tool/linux_amd64/compile -o ./b001/_go_.o -trimpath
"$WORK/b001=>" -p main -complete -goversion go1.13 -D _$WORK -c=4
./swig_intsize.go
cd /mabain_src
swig -go -cgo -intgosize 64 -module mabain -o $WORK/b001/mabain_wrap.cxx
-outdir $WORK/b001/ -c++ mabain.swigcxx
CGO_LDFLAGS='"-g" "-O2"' /usr/local/go/pkg/tool/linux_amd64/cgo -objdir
$WORK/b001/ -importpath _/mabain_src -- -I $WORK/b001/ -g -O2
$WORK/b001/_mabain_swig.go
cd $WORK
gcc -fno-caret-diagnostics -c -x c - -o /dev/null || true
gcc -Qunused-arguments -c -x c - -o /dev/null || true
gcc -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
gcc -gno-record-gcc-switches -c -x c - -o /dev/null || true
cd $WORK/b001
TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
-g -O2 -o ./_x001.o -c _cgo_export.c
TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
-g -O2 -o ./_x002.o -c _mabain_swig.cgo2.c
cd $WORK
g++ -fno-caret-diagnostics -c -x c - -o /dev/null || true
g++ -Qunused-arguments -c -x c - -o /dev/null || true
g++ -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
g++ -gno-record-gcc-switches -c -x c - -o /dev/null || true
cd /mabain_src
TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I
$WORK/b001/ -g -O2 -o $WORK/b001/_x003.o -c mabain_c_interface.cpp
cd $WORK/b001
TERM='dumb' g++ -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
-g -O2 -o ./_x004.o -c mabain_wrap.cxx
TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
-g -O2 -o ./_cgo_main.o -c _cgo_main.c
cd /mabain_src
TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -o
$WORK/b001/_cgo_.o $WORK/b001/_cgo_main.o $WORK/b001/_x001.o
$WORK/b001/_x002.o $WORK/b001/_x003.o $WORK/b001/_x004.o -g -O2
# _/mabain_src
/tmp/go-build678792509/b001/_x003.o: In function `mbOpen':
./mabain_c_interface.cpp:10: undefined reference to
`mabain::CONSTS::ReaderOptions()'
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Re: [go-nuts] building C++ wrapper for mabain lib with go1.13
On Tue, Mar 17, 2020 at 2:05 PM Mohamed Mahmoud wrote:
>
> On Tuesday, March 17, 2020 at 5:01:43 PM UTC-4, Mohamed Mahmoud wrote:
>>
>> I don't see anything obviously wrong. Add -v to -ldflags to see
>>>
>>> exactly how the external linker is being invoked. Make sure that
>>> -lmabain appears at the right point in the link line.
>>>
>>> Ian
>>
>>
>> I added -v its not showing libmabain , I am not sure what exactly you mean
>> by having -lmabain at the right point , below is my command line let me know
>> what it should be ?
>
> Step 25/26 : RUN cd ${MABAIN_SRC}/; go install -x -i -ldflags '-w
> -extldflags "-lmabain" -v'
>
> ---> Running in fd8ed360602a
>
> WORK=/tmp/go-build682038651
>
> mkdir -p $WORK/b001/
>
> swig -version
>
> cd $WORK
>
> /usr/local/go/pkg/tool/linux_amd64/compile -o ./b001/_go_.o -trimpath
> "$WORK/b001=>" -p main -complete -goversion go1.13 -D _$WORK -c=4
> ./swig_intsize.go
>
> cd /mabain_src
>
> swig -go -cgo -intgosize 64 -module mabain -o $WORK/b001/mabain_wrap.cxx
> -outdir $WORK/b001/ -c++ mabain.swigcxx
>
> CGO_LDFLAGS='"-g" "-O2"' /usr/local/go/pkg/tool/linux_amd64/cgo -objdir
> $WORK/b001/ -importpath _/mabain_src -- -I $WORK/b001/ -g -O2
> $WORK/b001/_mabain_swig.go
>
> cd $WORK
>
> gcc -fno-caret-diagnostics -c -x c - -o /dev/null || true
>
> gcc -Qunused-arguments -c -x c - -o /dev/null || true
>
> gcc -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
>
> gcc -gno-record-gcc-switches -c -x c - -o /dev/null || true
>
> cd $WORK/b001
>
> TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./ -g
> -O2 -o ./_x001.o -c _cgo_export.c
>
> TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./ -g
> -O2 -o ./_x002.o -c _mabain_swig.cgo2.c
>
> cd $WORK
>
> g++ -fno-caret-diagnostics -c -x c - -o /dev/null || true
>
> g++ -Qunused-arguments -c -x c - -o /dev/null || true
>
> g++ -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
>
> g++ -gno-record-gcc-switches -c -x c - -o /dev/null || true
>
> cd /mabain_src
>
> TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I
> $WORK/b001/ -g -O2 -o $WORK/b001/_x003.o -c mabain_c_interface.cpp
>
> cd $WORK/b001
>
> TERM='dumb' g++ -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./ -g
> -O2 -o ./_x004.o -c mabain_wrap.cxx
>
> TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./ -g
> -O2 -o ./_cgo_main.o -c _cgo_main.c
>
> cd /mabain_src
>
> TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
> -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -o
> $WORK/b001/_cgo_.o $WORK/b001/_cgo_main.o $WORK/b001/_x001.o
> $WORK/b001/_x002.o $WORK/b001/_x003.o $WORK/b001/_x004.o -g -O2
>
> # _/mabain_src
>
> /tmp/go-build682038651/b001/_x003.o: In function `mbOpen':
>
> ./mabain_c_interface.cpp:10: undefined reference to
> `mabain::CONSTS::ReaderOptions()'
>
> ./mabain_c_interface.cpp:12: undefined reference to `mabain::DB::DB(char
> const*, int, unsigned long, unsigned long, unsigned int)'
>
> ./mabain_c_interface.cpp:13: undefined reference to `mabain::DB::is_open()
> const'
>
> ./mabain_c_interface.cpp:14: undefined reference to `mabain::DB::StatusStr()
> const'
>
> ./mabain_c_interface.cpp:11: undefined reference to
> `mabain::CONSTS::WriterOptions()'
>
> /tmp/go-build682038651/b001/_x003.o: In function `mbFind':
>
> ./mabain_c_interface.cpp:44: undefined reference to `mabain::MBData::MBData()'
>
> ./mabain_c_interface.cpp:45: undefined reference to `mabain::DB::Find(char
> const*, int, mabain::MBData&) const'
>
> ./mabain_c_interface.cpp:44: undefined reference to
> `mabain::MBData::~MBData()'
>
> ./mabain_c_interface.cpp:44: undefined reference to
> `mabain::MBData::~MBData()'
>
> /tmp/go-build682038651/b001/_x003.o: In function `mbClose':
>
> ./mabain_c_interface.cpp:23: undefined reference to `mabain::DB::Close()'
>
> /tmp/go-build682038651/b001/_x003.o: In function `mbAdd':
>
> ./mabain_c_interface.cpp:30: undefined reference to `mabain::DB::Add(char
> const*, int, char const*, int, bool)'
>
> /tmp/go-build682038651/b001/_x003.o: In function `mbRemove':
>
> ./mabain_c_interface.cpp:37: undefined reference to `mabain::DB::Remove(char
> const*, int)'
>
> collect2: error: ld returned 1 exit status
>
> The command '/bin/sh -c cd ${MABAIN_SRC}/; go install -x -i -ldflags '-w
> -extldflags "-lmabain" -v'' returned a non-zero code: 2
It doesn't look like the -ldflags option is getting through to the linker. Try
go build "-ldflags=all=-w -extldflags=-lmabain -v"
Ian
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Re: [go-nuts] building C++ wrapper for mabain lib with go1.13
On Tuesday, March 17, 2020 at 5:01:43 PM UTC-4, Mohamed Mahmoud wrote:
>
> I don't see anything obviously wrong. Add -v to -ldflags to see
>
>> exactly how the external linker is being invoked. Make sure that
>> -lmabain appears at the right point in the link line.
>>
>> Ian
>>
>
> I added -v its not showing libmabain , I am not sure what exactly you mean
> by having -lmabain at the right point , below is my command line let me
> know what it should be ?
>
Step 25/26 : RUN cd ${MABAIN_SRC}/; go install -x -i -ldflags '-w
-extldflags "-lmabain" -v'
---> Running in fd8ed360602a
WORK=/tmp/go-build682038651
mkdir -p $WORK/b001/
swig -version
cd $WORK
/usr/local/go/pkg/tool/linux_amd64/compile -o ./b001/_go_.o -trimpath
"$WORK/b001=>" -p main -complete -goversion go1.13 -D _$WORK -c=4
./swig_intsize.go
cd /mabain_src
swig -go -cgo -intgosize 64 -module mabain -o $WORK/b001/mabain_wrap.cxx
-outdir $WORK/b001/ -c++ mabain.swigcxx
CGO_LDFLAGS='"-g" "-O2"' /usr/local/go/pkg/tool/linux_amd64/cgo -objdir
$WORK/b001/ -importpath _/mabain_src -- -I $WORK/b001/ -g -O2
$WORK/b001/_mabain_swig.go
cd $WORK
gcc -fno-caret-diagnostics -c -x c - -o /dev/null || true
gcc -Qunused-arguments -c -x c - -o /dev/null || true
gcc -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
gcc -gno-record-gcc-switches -c -x c - -o /dev/null || true
cd $WORK/b001
TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
-g -O2 -o ./_x001.o -c _cgo_export.c
TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
-g -O2 -o ./_x002.o -c _mabain_swig.cgo2.c
cd $WORK
g++ -fno-caret-diagnostics -c -x c - -o /dev/null || true
g++ -Qunused-arguments -c -x c - -o /dev/null || true
g++ -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
g++ -gno-record-gcc-switches -c -x c - -o /dev/null || true
cd /mabain_src
TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I
$WORK/b001/ -g -O2 -o $WORK/b001/_x003.o -c mabain_c_interface.cpp
cd $WORK/b001
TERM='dumb' g++ -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
-g -O2 -o ./_x004.o -c mabain_wrap.cxx
TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
-g -O2 -o ./_cgo_main.o -c _cgo_main.c
cd /mabain_src
TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -o
$WORK/b001/_cgo_.o $WORK/b001/_cgo_main.o $WORK/b001/_x001.o
$WORK/b001/_x002.o $WORK/b001/_x003.o $WORK/b001/_x004.o -g -O2
# _/mabain_src
/tmp/go-build682038651/b001/_x003.o: In function `mbOpen':
./mabain_c_interface.cpp:10: undefined reference to
`mabain::CONSTS::ReaderOptions()'
./mabain_c_interface.cpp:12: undefined reference to `mabain::DB::DB(char
const*, int, unsigned long, unsigned long, unsigned int)'
./mabain_c_interface.cpp:13: undefined reference to `mabain::DB::is_open()
const'
./mabain_c_interface.cpp:14: undefined reference to
`mabain::DB::StatusStr() const'
./mabain_c_interface.cpp:11: undefined reference to
`mabain::CONSTS::WriterOptions()'
/tmp/go-build682038651/b001/_x003.o: In function `mbFind':
./mabain_c_interface.cpp:44: undefined reference to
`mabain::MBData::MBData()'
./mabain_c_interface.cpp:45: undefined reference to `mabain::DB::Find(char
const*, int, mabain::MBData&) const'
./mabain_c_interface.cpp:44: undefined reference to
`mabain::MBData::~MBData()'
./mabain_c_interface.cpp:44: undefined reference to
`mabain::MBData::~MBData()'
/tmp/go-build682038651/b001/_x003.o: In function `mbClose':
./mabain_c_interface.cpp:23: undefined reference to `mabain::DB::Close()'
/tmp/go-build682038651/b001/_x003.o: In function `mbAdd':
./mabain_c_interface.cpp:30: undefined reference to `mabain::DB::Add(char
const*, int, char const*, int, bool)'
/tmp/go-build682038651/b001/_x003.o: In function `mbRemove':
./mabain_c_interface.cpp:37: undefined reference to
`mabain::DB::Remove(char const*, int)'
collect2: error: ld returned 1 exit status
The command '/bin/sh -c cd ${MABAIN_SRC}/; go install -x -i -ldflags '-w
-extldflags "-lmabain" -v'' returned a non-zero code: 2
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Re: [go-nuts] building C++ wrapper for mabain lib with go1.13
I don't see anything obviously wrong. Add -v to -ldflags to see
> exactly how the external linker is being invoked. Make sure that
> -lmabain appears at the right point in the link line.
>
> Ian
>
I added -v its not showing libmabain , I am not sure what exactly you mean
by having -lmabain at the right point , below is my command line let me
know what it should be ?
Step 25/26 : RUN cd ${MABAIN_SRC}/; go install -x -i -ldflags '-w
-extldflags "-lmabain" -v'
---> Running in fd8ed360602a
WORK=/tmp/go-build682038651
mkdir -p $WORK/b001/
swig -version
cd $WORK
/usr/local/go/pkg/tool/linux_amd64/compile -o ./b001/_go_.o -trimpath
"$WORK/b001=>" -p main -complete -goversion go1.13 -D _$WORK -c=4
./swig_intsize.go
cd /mabain_src
swig -go -cgo -intgosize 64 -module mabain -o $WORK/b001/mabain_wrap.cxx
-outdir $WORK/b001/ -c++ mabain.swigcxx
CGO_LDFLAGS='"-g" "-O2"' /usr/local/go/pkg/tool/linux_amd64/cgo -objdir
$WORK/b001/ -importpath _/mabain_src -- -I $WORK/b001/ -g -O2
$WORK/b001/_mabain_swig.go
cd $WORK
gcc -fno-caret-diagnostics -c -x c - -o /dev/null || true
gcc -Qunused-arguments -c -x c - -o /dev/null || true
gcc -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
gcc -gno-record-gcc-switches -c -x c - -o /dev/null || true
cd $WORK/b001
TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
-g -O2 -o ./_x001.o -c _cgo_export.c
TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
-g -O2 -o ./_x002.o -c _mabain_swig.cgo2.c
cd $WORK
g++ -fno-caret-diagnostics -c -x c - -o /dev/null || true
g++ -Qunused-arguments -c -x c - -o /dev/null || true
g++ -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
g++ -gno-record-gcc-switches -c -x c - -o /dev/null || true
cd /mabain_src
TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I
$WORK/b001/ -g -O2 -o $WORK/b001/_x003.o -c mabain_c_interface.cpp
cd $WORK/b001
TERM='dumb' g++ -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
-g -O2 -o ./_x004.o -c mabain_wrap.cxx
TERM='dumb' gcc -I /mabain_src -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -I ./
-g -O2 -o ./_cgo_main.o -c _cgo_main.c
cd /mabain_src
TERM='dumb' g++ -I . -fPIC -m64 -pthread -fmessage-length=0
-fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -o
$WORK/b001/_cgo_.o $WORK/b001/_cgo_main.o $WORK/b001/_x001.o
$WORK/b001/_x002.o $WORK/b001/_x003.o $WORK/b001/_x004.o -g -O2
# _/mabain_src
/tmp/go-build682038651/b001/_x003.o: In function `mbOpen':
./mabain_c_interface.cpp:10: undefined reference to
`mabain::CONSTS::ReaderOptions()'
./mabain_c_interface.cpp:12: undefined reference to `mabain::DB::DB(char
const*, int, unsigned long, unsigned long, unsigned int)'
./mabain_c_interface.cpp:13: undefined reference to `mabain::DB::is_open()
const'
./mabain_c_interface.cpp:14: undefined reference to
`mabain::DB::StatusStr() const'
./mabain_c_interface.cpp:11: undefined reference to
`mabain::CONSTS::WriterOptions()'
/tmp/go-build682038651/b001/_x003.o: In function `mbFind':
./mabain_c_interface.cpp:44: undefined reference to
`mabain::MBData::MBData()'
./mabain_c_interface.cpp:45: undefined reference to `mabain::DB::Find(char
const*, int, mabain::MBData&) const'
./mabain_c_interface.cpp:44: undefined reference to
`mabain::MBData::~MBData()'
./mabain_c_interface.cpp:44: undefined reference to
`mabain::MBData::~MBData()'
/tmp/go-build682038651/b001/_x003.o: In function `mbClose':
./mabain_c_interface.cpp:23: undefined reference to `mabain::DB::Close()'
/tmp/go-build682038651/b001/_x003.o: In function `mbAdd':
./mabain_c_interface.cpp:30: undefined reference to `mabain::DB::Add(char
const*, int, char const*, int, bool)'
/tmp/go-build682038651/b001/_x003.o: In function `mbRemove':
./mabain_c_interface.cpp:37: undefined reference to
`mabain::DB::Remove(char const*, int)'
collect2: error: ld returned 1 exit status
The command '/bin/sh -c cd ${MABAIN_SRC}/; go install -x -i -ldflags '-w
-extldflags "-lmabain" -v'' returned a non-zero code: 2
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Re: [go-nuts] building C++ wrapper for mabain lib with go1.13
On Tue, Mar 17, 2020 at 9:04 AM wrote: > > I have created swigcxx file , since swig now is natively integrated in go > tools > I ran the following to build a test program that interact with the mabain > wrapper go package to test the APIs > > go install -x -i -ldflags '-w -extldflags "-lmabain"' > > > However I ran into linker errors that I am not able to resolve > > > # mabain > > /tmp/go-build378478658/b001/_x003.o: In function `mbOpen': > > ./mabain_c_interface.cpp:10: undefined reference to > `mabain::CONSTS::ReaderOptions()' > > ./mabain_c_interface.cpp:12: undefined reference to `mabain::DB::DB(char > const*, int, unsigned long, unsigned long, unsigned int)' > > ./mabain_c_interface.cpp:13: undefined reference to `mabain::DB::is_open() > const' > > ./mabain_c_interface.cpp:14: undefined reference to `mabain::DB::StatusStr() > const' > > ./mabain_c_interface.cpp:11: undefined reference to > `mabain::CONSTS::WriterOptions()' > > /tmp/go-build378478658/b001/_x003.o: In function `mbFind': > > ./mabain_c_interface.cpp:44: undefined reference to `mabain::MBData::MBData()' > > ./mabain_c_interface.cpp:45: undefined reference to `mabain::DB::Find(char > const*, int, mabain::MBData&) const' > > ./mabain_c_interface.cpp:44: undefined reference to > `mabain::MBData::~MBData()' > > ./mabain_c_interface.cpp:44: undefined reference to > `mabain::MBData::~MBData()' > > /tmp/go-build378478658/b001/_x003.o: In function `mbClose': > > ./mabain_c_interface.cpp:23: undefined reference to `mabain::DB::Close()' > > /tmp/go-build378478658/b001/_x003.o: In function `mbAdd': > > ./mabain_c_interface.cpp:30: undefined reference to `mabain::DB::Add(char > const*, int, char const*, int, bool)' > > /tmp/go-build378478658/b001/_x003.o: In function `mbRemove': > > ./mabain_c_interface.cpp:37: undefined reference to `mabain::DB::Remove(char > const*, int)' > > collect2: error: ld returned 1 exit status > > > > root@e75d907ebd87:/usr/local/lib# ls -ltr > > total 1844 > > -rwxr-xr-x 1 root root 1887608 Mar 17 11:42 libmabain.so > > root@e75d907ebd87:/usr/local/lib# > > > > root@e75d907ebd87:/usr/local/lib# objdump -t libmabain.so | grep ReaderOption > > 00022b60 g F .text 0003 > _ZN6mabain6CONSTS13ReaderOptionsEv > > > Any suggestions on how to fix this linker error ? I don't see anything obviously wrong. Add -v to -ldflags to see exactly how the external linker is being invoked. Make sure that -lmabain appears at the right point in the link line. Ian -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CAOyqgcWhbQJZ8tqT4LrOe2sR%3DUdfJXDos15r27R-VgpB3%2BfB8w%40mail.gmail.com.
