Hello, I tried your example and I got
"c:/programdata/chocolatey/lib/mingw/tools/install/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
$WORK\b001\_x002.o: in function `_cgo_d32036b73474_Cfunc_print':
/tmp/go-build/cgo-gcc-prolog:49: undefined reference to `print'
collect2.exe: error: ld returned 1 exit status"
Windows 10, VS Code.
Have you some idea why?
Em segunda-feira, 15 de abril de 2019 às 05:51:31 UTC-3, Sebastien Binet
escreveu:
> On Thu, Apr 11, 2019 at 5:54 PM av <aleksanda...@gmail.com> wrote:
>
>> Hi *,
>>
>> I want to compile C++ code, because the library I need is C++ only.
>>
>> Here is my wrapper.hpp:
>> #include <iostream>
>>
>> void print() {
>> std::cout << "Xx";
>> }
>>
>> And here is my main.go:
>> package main
>>
>> // #cgo CXXFLAGS: -I.
>> // #cgo CFLAGS: -I.
>> // #cgo LDFLAGS:
>> // #include "wrapper.hpp"
>> import "C"
>>
>> func main() {
>> C.print()
>> }
>>
>> The output of "go build" is:
>> In file included from ./main.go:6:0:
>> ./wrapper.hpp:1:20: fatal error: iostream: No such file or directory
>> #include <iostream>
>> ^
>> compilation terminated.
>>
>> I can make this work by using Makefile and static library, but this
>> reduce portability significantly.
>>
>> Basically I want to create libapt-pkg wrapper, but I don't want to
>> introduce another debian package for the wrapper.
>>
>> Do you have any idea how to make this work?
>>
> you'd need to export a C-only API in the header files you want to use
> from/with cgo.
>
> ie:
>
> // wrapper.h
> #ifdef __cplusplus
> extern "C" {
> #endif
>
> void print();
>
> #ifdef __cplusplus
> }
> #endif
>
> and:
>
> // wrapper.cc
> #include <iostream>
> #include "wrapper.h"
>
> void print() {
> std::cout << "Xx" << std::endl;
> }
>
> and, finally:
>
> package main
>
> // #include "wrapper.h"
> import "C"
>
> func main() {
> C.print()
> }
>
> hth,
> -s
>
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