I need to include a C++ code from git submodule to my GO program and have following code:
$ tree
├── git-imaginary-submodule
│ ├── test.cc
│ └── test.h
└── main.go
1 directory, 3 files
$ cat main.go
package main
//#cgo CPPFLAGS: -g -I${SRCDIR}/git-imaginary-submodule
//#cgo CFLAGS: -g -I${SRCDIR}/git-imaginary-submodule
//#include "test.h"
import "C"
import (
"log"
)
func main() {
log.Println(C.test())
}
When I run go build
I have following:
$ go build
# github.com/shagabutdinov/stackoverflow-go-include-question/nope
/usr/bin/ld: $WORK/b001/_x002.o: in function `_cgo_bc718ee76ee7_Cfunc_test':
/tmp/go-build/cgo-gcc-prolog:43: undefined reference to `test'
collect2: error: ld returned 1 exit status
But when the C++ code is locally located build is fine:
$ tree
.
├── main.go
├── test.cc
└── test.h
0 directories, 3 files
$ go build .
# ok
$ cat main.go
package main
//#include "test.h"
import "C"
import (
"log"
)
func main() {
log.Println(C.test())
}
Here are source code for test.h
and test.cc
:
$ cat test.h
#ifdef __cplusplus
extern "C" {
#endif
int test();
#ifdef __cplusplus
}
#endif
$ cat test.cc
#include <vector>
#include "test.h"
int test() {
std::vector<int> vector = {1, 2};
return vector[0] + vector[1];
}
How can I use C++ code located in another directory?