Hey Marvin,
Were you able to find any solutions to your problem?
I have a similar problem of LDFLAGS not bubbling up through packages --
Here I have
pkg A statically links libA
pkg B (which imports A) also uses libA.
I get a linker error stating multiple definitions of the functions.
-Sriram
On Friday, November 7, 2014 at 1:46:31 AM UTC+5:30, Marvin Humphrey wrote:
>
> Greetings,
>
> I'd like to use CGO to access C functionality linked statically into a
> *different* Go package.
>
> Here's a simplified demo:
>
> src/foo/foo.go:
>
> package foo
> // int
> // forty_two() {
> // return 42;
> // }
> import "C"
>
> try.go:
>
> package main
> import "fmt"
> import "foo"
> // extern int forty_two();
> // int
> // forty_three() {
> // return forty_two() + 1;
> // }
> import "C"
> func main() {
> fmt.Println(int(C.forty_three()))
> }
>
> Here's the output when I try to run `try.go` (after running `go install
> foo`):
>
> $ go run try.go
> # command-line-arguments
> Undefined symbols for architecture x86_64:
> "_forty_two", referenced from:
> __cgo_45ed811e7bcb_Cfunc_forty_two in try.cgo2.o
> (maybe you meant: __cgo_45ed811e7bcb_Cfunc_forty_two)
> ld: symbol(s) not found for architecture x86_64
> clang: error: linker command failed with exit code 1 (use
> -v to see invocation)
>
> Examining the contents of the installed package file, it looks like
> `_forty_two` ought to be available:
>
> $ nm -g pkg/darwin_amd64/foo.a
>
> pkg/darwin_amd64/foo.a(_all.o):
> 0000000000000000 T _forty_two
>
> Suggestions?
>
> Using CGO_LDFLAGS to supply a full path to the package archive file didn't
> do the trick. (Not that I expected it to, but the output is interesting.)
>
> $ export CGO_LDFLAGS=$GOPATH/pkg/darwin_amd64/foo.a
> $ go run try.go
> # command-line-arguments
> ld: warning: ignoring file ./pkg/darwin_amd64/foo.a, file was built
> for archive which is not the architecture being linked
> (x86_64): ./pkg/darwin_amd64/foo.a
> [...]
>
> Marvin Humphrey
>
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