SOLVED!
It took a while to sort out the various locations.
Environment Variables:
....
export LIBRARY_PATH=/usr/local/Frameworks/Python.framework/Versions/3.9/lib
export
PKG_CONFIG_PATH=/usr/local/Frameworks/Python.framework/Versions/3.9/lib/pkgconfig
....
Code:
...
package main
/*
#cgo pkg-config: python3
#cgo CFLAGS: -I/usr/local/Frameworks/Python.framework/Headers
#cgo LDFLAGS: -L/usr/local/Frameworks/Python.framework/Versions/3.9/lib
-lpython3.9 -ldl -framework CoreFoundation
#include <Python.h>
*/
import "C"
import (
"fmt"
)
func main() {
C.Py_Initialize()
fmt.Println(C.GoString(C.Py_GetVersion()))
C.Py_Finalize()
}
...
On Wed, Nov 23, 2022 at 6:59 PM Deiter <hwaterf...@gmail.com> wrote:
> Doh! I forgot the include. I get a linker error now:
> ...
> package main
>
> /*
> #cgo pkg-config: python3
> #cgo LDFLAGS: -lpython3.8
> #include <Python.h>
> */
> import "C"
>
> import (
> "fmt"
> )
>
> func main() {
> C.Py_Initialize()
> fmt.Println(C.GoString(C.Py_GetVersion()))
> C.Py_Finalize()
> }
> ...
> $ go run .
> # producer
> /usr/local/go/pkg/tool/darwin_amd64/link: running clang failed: exit
> status 1
> ld: library not found for -lpython3.8
> clang: error: linker command failed with exit code 1 (use -v to see
> invocation)
> ...
> Clearly a library is missing but I'm not clear where to find it or how to
> inform the linker. Thanks.
>
> On Wednesday, November 23, 2022 at 6:48:25 PM UTC-8 Deiter wrote:
>
>> macOS: 12.5.1
>> go: go1.19.3 darwin/amd64
>>
>> I'm having trouble building a go module that uses Python as a shared
>> library.
>>
>> This code works:
>> ...
>> package main
>>
>> // #include <float.h>
>> import "C"
>> import "fmt"
>>
>> func main() {
>> fmt.Println("Max float value of float is", C.FLT_MAX)
>> }
>> ...
>> $ go run .
>> Max float value of float is 3.4028234663852886e+38
>> ...
>> I run into problems when I try to include Python:
>> ...
>> package main
>>
>> /*
>> #cgo pkg-config: python3
>> #cgo LDFLAGS: -lpython3.8
>> */
>> import "C"
>>
>> import (
>> "fmt"
>> )
>>
>> func main() {
>> C.Py_Initialize()
>> fmt.Println(C.GoString(C.Py_GetVersion()))
>> C.Py_Finalize()
>> }
>> ...
>> $ go run .
>> # producer
>> ./producer.go:16:2: could not determine kind of name for C.Py_Finalize
>> ./producer.go:15:25: could not determine kind of name for C.Py_GetVersion
>> ./producer.go:14:2: could not determine kind of name for C.Py_Initialize
>> ...
>>
>> Any suggestions? I'm guessing it has something to do w/ setting
>> PKG_CONFIG_PATH and/or CGO_CFLAGS but I'm not certain...
>>
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