C functions have to be available when the Go package is built.
yes, but static lib is kind of definition.
//#cgo CFLAGS: -I <include_path>
//#cgo CXXFLAGS="${CFLAGS}"
//#cgo LDFLAGS: -L <lib_path> -l<lib>
will this above work ? if I want to build a go static lib?
> how about go call c wrapper function , c wrapper function call c
function
> in lib?
Please reply to the mailing list, not just to me.
In general all the C functions have to be available when the Go
package is built.
在 2017年4月19日星期三 UTC+8上午5:58:38，Ian Lance Taylor写道：
>
> On Tue, Apr 18, 2017 at 1:37 AM, hui zhang <fastf...@gmail.com
> <javascript:>> wrote:
> > add a c wrapper around cfunc.h not help either.
> >
> > 在 2017年4月18日星期二 UTC+8下午4:36:26，hui zhang写道：
> >>
> >> I want to embedded go code in c/c++ program.
> >> my approach as below, however go code can not be compiled
> >> C main() --> go func --> c func(in static lib)
> >>
> >>
> >> <main.c>
> >> #include "libgofunc.h"
> >> int main() {
> >> Gofunc();
> >> }
> >>
> >> <gofunc.go> CGO_ENABLED=1 go build -buildmode=c-archive -o
> >> libgofunc.a --> error
> >>
> >> Undefined symbols for architecture x86_64: "_cfunc"
> >>
> >> package main
> >>
> >> //#inclue "cfunc.h"
> >> import "C"
> >> //export Gofunc
> >> func Gofunc() {
> >> C.cfunc() //cfunc is in a static lib
> >> }func main() {} // Required but ignored
> >>
> >> <cfunc.h , cfunc.a>
> >> extern void cfunc();
>
> We don't currently support a Go package calling a C function that is
> not yet defined. You have to actually provide a definition for the
> function, not just a declaration.
>
> Ian
>
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