After reading Statically compiled Go programs, always, even with cgo, using musl I'm trying to use described method to statically link LuaJIT.
- Using https://github.com/aarzilli/golua go bindings
- Assuming musl and golua are already installed
Go code I try to build:
package main
import "github.com/aarzilli/golua/lua"
import "fmt"
func test(L *lua.State) int {
fmt.Println("hello world! from go!")
return 0
}
func test2(L *lua.State) int {
arg := L.CheckInteger(-1)
argfrombottom := L.CheckInteger(1)
fmt.Print("test2 arg: ")
fmt.Println(arg)
fmt.Print("from bottom: ")
fmt.Println(argfrombottom)
return 0
}
func main() {
L := lua.NewState()
defer L.Close()
L.OpenLibs()
L.GetField(lua.LUA_GLOBALSINDEX, "print")
L.PushString("Hello World!")
L.Call(1, 0)
L.PushGoFunction(test)
L.PushGoFunction(test)
L.PushGoFunction(test)
L.PushGoFunction(test)
L.PushGoFunction(test2)
L.PushInteger(42)
L.Call(1, 0)
L.Call(0, 0)
L.Call(0, 0)
L.Call(0, 0)
// this will fail as we didn't register test2 function
err := L.DoString("test2(42)")
fmt.Printf("Ciao %v\n", err)
}
Build command with parameters and output:
$ CC="/usr/local/musl/bin/musl-gcc" go build --ldflags '-linkmode external -extldflags "-static"' basic.go
# command-line-arguments
/usr/local/go/pkg/tool/linux_amd64/link: running /usr/local/musl/bin/musl-gcc failed: exit status 1
/usr/bin/ld: cannot find -lluajit-5.1
collect2: error: ld returned 1 exit status
Using LD_DEBUG=all I can get more information (8000+ lines).
My question: what is the problem and how to solve it? I think there can be some hint here but I can't quite grasp it.
I took following steps:
1. Build static LuaJIT library with musl.
$ make STATIC_CC="/usr/local/musl/bin/musl-gcc" CCOPT="-static -fPIC" BUILDMODE="static"
...
==== Successfully built LuaJIT 2.0.4 ====
2. Build dynamic LuaJIT library with musl.
$ make DYNAMIC_CC="/usr/local/musl/bin/musl-gcc" BUILDMODE="dynamic"
...
==== Successfully built LuaJIT 2.0.4 ====
3. Check build.
$ find . -iname *.a -o -iname *.so
./src/libluajit.a
./src/libluajit.so
4. Install it.
$ sudo make install
...
==== Successfully installed LuaJIT 2.0.4 to /usr/local ====
5. Check installation.
$ pkg-config luajit --cflags
-I/usr/include/luajit-2.0
$ pkg-config luajit --libs
-lluajit-5.1
6. Modify golua lua.go file to use hardcoded cgo parameters.
I had problems overriding those values so I simply modify source code.
old C comment with cgo parameters:
/*
#cgo CFLAGS: -I ${SRCDIR}/lua
#cgo llua LDFLAGS: -llua
#cgo luaa LDFLAGS: -llua -lm -ldl
#cgo linux,!llua,!luaa LDFLAGS: -llua5.1
#cgo darwin,!luaa pkg-config: lua5.1
#cgo freebsd,!luaa LDFLAGS: -llua-5.1
#cgo windows,!llua LDFLAGS: -L${SRCDIR} -llua -lmingwex -lmingw32
#include <lua.h>
#include <stdlib.h>
#include "golua.h"
*/
import "C"
new:
/*
#cgo CFLAGS: -I/usr/include/luajit-2.0 -I${SRCDIR}/lua
#cgo LDFLAGS: -lluajit-5.1
#include <lua.h>
#include <stdlib.h>
#include "golua.h"
*/
import "C"
7. Build some example
As shown at the beggining of question.
Where LuaJIT got installed:
$ find / -iname libluajit* 2> /dev/null
/usr/local/lib/libluajit-5.1.so.2
/usr/local/lib/libluajit-5.1.a
/usr/local/lib/libluajit-5.1.so
/usr/local/lib/libluajit-5.1.so.2.0.4
/usr/lib/libluajit-5.1.so.2.0.5
/usr/lib/libluajit-5.1.so.2
/usr/lib/libluajit-5.1.a
/usr/lib/libluajit-5.1.so
/usr/lib/libluajit.s
EDIT 1
I've followed @putu's comment and changed #cgo LDFLAGS to
#cgo LDFLAGS: -L/usr/local/lib -lluajit-5.1
now I have
$ CC="/usr/local/musl/bin/musl-gcc" go build --ldflags '-linkmode external -extldflags "-static -fPIC"' basic.go
# command-line-arguments
/usr/local/go/pkg/tool/linux_amd64/link: running /usr/local/musl/bin/musl-gcc failed: exit status 1
/tmp/go-link-916770907/000000.o: In function `printf':
/usr/include/x86_64-linux-gnu/bits/stdio2.h:104: undefined reference to `__printf_chk'
collect2: error: ld returned 1 exit status