Golang new version for CGO support for a pit

This is a creation in Article, where the information may have evolved or changed.

File Test.h as follows

#ifndef _test_h#define _test_h#ifdef __cplusplusextern "C" {#endifextern void MyTest (); #ifdef __cplusplus} #endif #endif

File test.cc as follows

#include "_cgo_export.h" extern "C" {void MyTest () {test ();}}

File Test.go as follows

Package test/* #include "test.h" */import "C" import () func test () {c.mytest ()}//export testfunc Test () {println ("Hello")}

If you do go build-x you will see the following results

Work=/tmp/go-build845372545mkdir-p $WORK/_/home/pirate/programs/goclipse/workspace/v8/src/test/_obj/mkdir-p $ work/_/home/pirate/programs/goclipse/workspace/v8/src/cd/home/pirate/programs/goclipse/workspace/v8/src/test/ Home/pirate/programs/go/pkg/tool/linux_amd64/cgo-objdir $WORK/_/home/pirate/programs/goclipse/workspace/v8/src/ test/_obj/---I $WORK/_/home/pirate/programs/goclipse/workspace/v8/src/test/_obj/test.go/home/pirate/programs/go /pkg/tool/linux_amd64/6c-f-v-w-I $WORK/_/home/pirate/programs/goclipse/workspace/v8/src/test/_obj/-i/home/ Pirate/programs/go/pkg/linux_amd64-o $WORK/_/home/pirate/programs/goclipse/workspace/v8/src/test/_obj/_cgo_ defun.6-d goos_linux-d goarch_amd64 $WORK/_/home/pirate/programs/goclipse/workspace/v8/src/test/_obj/_cgo_ Defun.cgcc-i. -g-o2-fpic-m64-pthread-print-libgcc-file-namegcc-i. -g-o2-fpic-m64-pthread-i $WORK/_/home/pirate/programs/goclipse/workspace/v8/src/test/_obj/-o $WORK/_/home/pirate /programs/goclipse/workspace/v8/Src/test/_obj/_cgo_main.o-c $WORK/_/home/pirate/programs/goclipse/workspace/v8/src/test/_obj/_cgo_main.cgcc-i. -g-o2-fpic-m64-pthread-i $WORK/_/home/pirate/programs/goclipse/workspace/v8/src/test/_obj/-o $WORK/_/home/pirate /programs/goclipse/workspace/v8/src/test/_obj/_cgo_export.o-c $WORK/_/home/pirate/programs/goclipse/workspace/ V8/src/test/_obj/_cgo_export.cgcc-i. -g-o2-fpic-m64-pthread-i $WORK/_/home/pirate/programs/goclipse/workspace/v8/src/test/_obj/-o $WORK/_/home/pirate /programs/goclipse/workspace/v8/src/test/_obj/test.cgo2.o-c $WORK/_/home/pirate/programs/goclipse/workspace/v8/ Src/test/_obj/test.cgo2.cgcc-i. -g-o2-fpic-m64-pthread-i $WORK/_/home/pirate/programs/goclipse/workspace/v8/src/test/_obj/-o $WORK/_/home/pirate /programs/goclipse/workspace/v8/src/test/_obj/test.o-c./test.cg++-I. -g-o2-fpic-m64-pthread-i $WORK/_/home/pirate/programs/goclipse/workspace/v8/src/test/_obj/-o $WORK/_/home/pirate /programs/goclipse/workspace/v8/src/test/_obj/test.cc.o-c./test.ccg++-I. -g-o2-fpic-m64-pthread-o $WORK/_/home/pirate/programs/goclipse/workspace/v8/src/test/_obj/_cgo_.o $WORK/_/home/ PIRATE/PROGRAMS/GOCLIPSE/WORKSPACE/V8/SRC/TEST/_OBJ/_CGO_MAIN.O $WORK/_/home/pirate/programs/goclipse/workspace /V8/SRC/TEST/_OBJ/_CGO_EXPORT.O $WORK/_/HOME/PIRATE/PROGRAMS/GOCLIPSE/WORKSPACE/V8/SRC/TEST/_OBJ/TEST.CGO2.O $ WORK/_/HOME/PIRATE/PROGRAMS/GOCLIPSE/WORKSPACE/V8/SRC/TEST/_OBJ/TEST.O $WORK/_/home/pirate/programs/goclipse/ workspace/v8/src/test/_obj/test.cc.o# _/home/pirate/programs/goclipse/workspace/v8/src/test/tmp/ go-build845372545/_/home/pirate/programs/goclipse/workspace/v8/src/test/_obj/test.cc.o:in function ' myTest ':./ Test.cc:6: Undefined reference to ' test () ' Collect2:error:ld returned 1 exit status

Here you can see is test.cc is compiled with g++, but the declaration of the test function is in the _CGO_EXPORT.C, the declaration is in the _cgo_export.h, g++ compile will certainly not find this function, but only need a small change to solve the problem, The include "_cgo_export.h" is moved to the extern "C", the final following

extern "C" {#include "_cgo_export.h" void MyTest () {test ();}}