Yes, I tried quite a few varieties, such as:
//#cgo LDFLAGS: $GOPATH/src/kflow/libcolor/lib/libCOLOR with/without .a
//#cgo LDFLAGS: ${SRCDIR}kflow/libcolor/lib/libCOLOR with/without .a
//#cgo LDFLAGS: -L${SRCDIR}kflow/libcolor/lib -l:libCOLOR with/without .a
//#cgo LDFLAGS: -L${SRCDIR}kflow/libcolor/lib -lCOLOR with/without .a
None above works for me so far, they are simply ignored during the building
process. I even played with the empty spaces at various places, still no
luck :(
Thanks,
Chun
On Wednesday, March 1, 2017 at 1:57:15 PM UTC-5, therecipe wrote:
>
> did you try it without the ".a" suffix in the LDFLAGS?
>
> Am Dienstag, 28. Februar 2017 20:06:20 UTC+1 schrieb Chun Zhang:
>>
>> Hi, All,
>>
>> I have googled quite a bit about this issue, there are some tutorials
>> online. But most of them targeted either at older go releases or C instead
>> of C++.
>>
>> Can somebody please help me to figure out how to solve the following
>> issues?
>>
>> I have to use a static library, wrote in C++ in a go project. I have the
>> libcolor.a and the COLOR.h header file, the libcolor.a relies on some other
>> libraries, such as libboost_system.a, libxml2.a etc to build.
>>
>> I wrote a libcolor.swigcxx file as follows:
>> ---------------------------
>> %module libcoror
>>
>> %{
>> #include "include/COLOR.h"
>> #include <stddef.h>
>> #include <vector>
>>
>> /* This is where we initialize any global parameters that are not
>> search-thread specific */
>> extern void COLOR_init_global_config(int argc, char *argv[]); // from
>> the COLOR.h file, which is one of the APIs I would like to use
>>
>> %}
>>
>> #include "include/COLOR.h"
>> extern void COLOR_init_global_config(int argc, char *argv[]);
>> ---------------------------
>>
>> An empty libcolor.go file with the following lines was manually created
>>
>> ---------------------------
>> package libcolor
>>
>> // #cgo CFLAGS: -I .
>> // #cgo CXXFLAGS: -std=c++11 <--- this does not seem to work
>> // #cgo LDFLAGS: -L${SRCDIR}/lib/ -lCOLOR.a -lz <--- this is placed at
>> the correct place
>> ---------------------------
>>
>> When I tried to build this using "go build -x" CLI, I hit the following
>> error:
>>
>> WORK=/tmp/go-build797493895
>> mkdir -p $WORK/klow/libcolor/_obj/
>> mkdir -p $WORK/klow/
>> swig -version
>> cd $WORK
>> /usr/local/go/pkg/tool/linux_amd64/compile -o ./klow/libcolor/_obj/_go_.o
>> -trimpath . -p main -complete -buildid
>> 73a7f9534f74346db4b3e0f48875da9dbf8bc2fd -D _$WORK ./swig_intsize.go
>> cd /home/chzhang/go/src/klow/libcolor
>> swig -go -cgo -intgosize 64 -module libcolor -o
>> $WORK/klow/libcolor/_obj/libcolor_wrap.cxx -outdir
>> $WORK/klow/libcolor/_obj/ -c++ libcolor.swigcxx
>> CGO_LDFLAGS="-g" "-O2" /usr/local/go/pkg/tool/linux_amd64/cgo -objdir
>> $WORK/klow/libcolor/_obj/ -importpath klow/libcolor -- -I
>> $WORK/klow/libcolor/_obj/ $WORK/klow/libcolor/_obj/libcolor.go
>> cd $WORK
>> gcc -fdebug-prefix-map=a=b -c trivial.c
>> gcc -gno-record-gcc-switches -c trivial.c
>> cd /home/chzhang/go/src/klow/libcolor
>> gcc -I . -fPIC -m64 -pthread -fmessage-length=0
>> -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I
>> $WORK/klow/libcolor/_obj/ -g -O2 -o $WORK/klow/libcolor/_obj/_cgo_main.o -c
>> $WORK/klow/libcolor/_obj/_cgo_main.c
>> gcc -I . -fPIC -m64 -pthread -fmessage-length=0
>> -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I
>> $WORK/klow/libcolor/_obj/ -g -O2 -o $WORK/klow/libcolor/_obj/_cgo_export.o
>> -c $WORK/klow/libcolor/_obj/_cgo_export.c
>> gcc -I . -fPIC -m64 -pthread -fmessage-length=0
>> -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I
>> $WORK/klow/libcolor/_obj/ -g -O2 -o
>> $WORK/klow/libcolor/_obj/_tmp_go-build797493895_klow_libcolor__obj_libcolor.cgo2.o
>>
>> -c
>> $WORK/klow/libcolor/_obj/_tmp_go-build797493895_klow_libcolor__obj_libcolor.cgo2.c
>> g++ -I . -fPIC -m64 -pthread -fmessage-length=0
>> -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I
>> $WORK/klow/libcolor/_obj/ -g -O2 -o
>> $WORK/klow/libcolor/_obj/_tmp_go-build797493895_klow_libcolor__obj_libcolor_wrap.cxx.o
>>
>> -c $WORK/klow/libcolor/_obj/libcolor_wrap.cxx
>> # klow/libcolor
>> In file included from $WORK/klow/libcolor/_obj/libcolor_wrap.cxx:243:0:
>> ./include/COLOR.h:13:43: warning: defaulted and deleted functions only
>> available with -std=c++11 or -std=gnu++11
>> PerSessionData(const PerSessionData &d)=default;
>> ^
>> ./include/COLOR.h:14:53: warning: defaulted and deleted functions only
>> available with -std=c++11 or -std=gnu++11
>> PerSessionData& operator=(const PerSessionData&d)=default;
>> ^
>> g++ -I . -fPIC -m64 -pthread -fmessage-length=0
>> -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -o
>> $WORK/klow/libcolor/_obj/_cgo_.o $WORK/klow/libcolor/_obj/_cgo_main.o
>> $WORK/klow/libcolor/_obj/_cgo_export.o
>> $WORK/klow/libcolor/_obj/_tmp_go-build797493895_klow_libcolor__obj_libcolor.cgo2.o
>>
>> $WORK/klow/libcolor/_obj/_tmp_go-build797493895_klow_libcolor__obj_libcolor_wrap.cxx.o
>>
>> -g -O2
>> # klow/libcolor
>> /tmp/go-build797493895/klow/libcolor/_obj/_tmp_go-build797493895_klow_libcolor__obj_libcolor_wrap.cxx.o:
>>
>> In function `_wrap_COLOR_init_global_config_libcolor_3cea422eb6211fe0':
>> /tmp/go-build/klow/libcolor/_obj/libcolor_wrap.cxx:285: undefined
>> reference to `COLOR_init_global_config(int, char**)'
>> collect2: error: ld returned 1 exit status
>>
>>
>> Looks like there are two errors:
>> 1, the C++11 warning
>> 2, the linker can't find the function COLOR_init_global_config in the
>> static library. That means the compiler directives I defined in libcolor.go
>> was not successfully passed to the compiler. From the log, looks like
>> another libcolor.go was generated in the $WORK directory by swig. The one I
>> manually created was not used at all.
>>
>> Can somebody please help me to figure out what I need to do to get this
>> compiled? The tutorial on swig.org does not seem to help. I tried to
>> manually build as in
>>
>> http://zacg.github.io/blog/2013/06/06/calling-c-plus-plus-code-from-go-with-swig/
>> But the 6c etc go tools does not exist anymore.
>>
>>
>> Thanks,
>> Chun
>>
>> --------------------------------
>>
>> This is my setup
>> go version go1.7.1 linux/amd64
>> GOARCH="amd64"
>> GOBIN=""
>> GOEXE=""
>> GOHOSTARCH="amd64"
>> GOHOSTOS="linux"
>> GOOS="linux"
>> GOPATH="/home/chzhang/go"
>> GORACE=""
>> GOROOT="/usr/local/go"
>> GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
>> CC="gcc"
>> GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0
>> -fdebug-prefix-map=/tmp/go-build155119108=/tmp/go-build
>> -gno-record-gcc-switches"
>> CXX="g++"
>> CGO_ENABLED="1"
>>
>>
>>
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