compiling projects with multiple files in go - compilation

Question

I use gccgo to compile my projects. here is my directory layout. I read this Q/A thread How to use custom packages in golang?
so followed this one
src/
+-fibo/
| +-fibo.go
+main.go
and here are the code listing
main.go
package main
import (
"os"
"fmt"
"strconv"
"src/fibo"
)
func main(){
if len(os.Args) < 2 {
fmt.Printf("ur input sucks\n")
}
num,_ := strconv.Atoi(os.Args[1])
fibo.Fibo(num)
}
fibo/fibo.go
package fibo
import "fmt"
func Fibo(num int) {
var a,b int
for i :=0; i< num; i++ {
a, b = b, a+b
fmt.Print(a, " ")
}
fmt.Print("\n")
}
but when I try to compile, i follwed usual gcc procedure. compile files separately and link them together into final executable. I get this error
.../go-lang-expts/src $ gccgo -c -ofibo/fibo.o fibo/fibo.go
.../go-lang-expts/src $ gccgo -c -omain.o main.go
main.go:7:10: error: import file ‘src/fibo’ not found
main.go:18:2: error: reference to undefined name ‘fibo’
.../go-lang-expts/src $
I am stuck here. I tried different combination of directory structures. none helped. what am I missing? is there any environment variable I should set, even for this??

Answer 1

It looks like you may not have set the GOPATH Environment Variable
From How to Write Go Code
The GOPATH environment variable specifies the location of your workspace. It is likely the only environment variable you'll need to set when developing Go code.
Given your current directory structure of
src/
+-fibo/
| +-fibo.go
+main.go
If your src directory is under GOPATH then you should be able to just do:
import "fibo"
in main.go.
See also "GOPATH environment variable" from The go command documentation.

Answer 2

This set of commands worked for me.
.../go-lang-expts/src $ gccgo -c -fgo-pkgpath=fibo -ofibo/fibo.o fibo/fibo.go
This will name the package fibo, so you will have to import it as such in main.go
import "fibo"
Now you can compile main.go by telling where fibo.o library is
.../go-lang-expts/src $ gccgo -c main.go -Ifibo
Then you need to link the two file to create an executable main
.../go-lang-expts/src $ gccgo -o main main.o fibo/fibo.o