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"
>
>
>
--
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.
For more options, visit https://groups.google.com/d/optout.
