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// +build byollvm
package main
// This file provides a Link() function that uses the bundled lld if possible.
import (
"errors"
"os"
"os/exec"
"unsafe"
)
/*
#include <stdbool.h>
#include <stdlib.h>
bool tinygo_link_elf(int argc, char **argv);
bool tinygo_link_wasm(int argc, char **argv);
*/
import "C"
// Link invokes a linker with the given name and flags.
//
// This version uses the built-in linker when trying to use lld.
func Link(linker string, flags ...string) error {
switch linker {
case "ld.lld":
flags = append([]string{"tinygo:" + linker}, flags...)
var cflag *C.char
buf := C.calloc(C.size_t(len(flags)), C.size_t(unsafe.Sizeof(cflag)))
cflags := (*[1 << 10]*C.char)(unsafe.Pointer(buf))[:len(flags):len(flags)]
for i, flag := range flags {
cflag := C.CString(flag)
cflags[i] = cflag
defer C.free(unsafe.Pointer(cflag))
}
ok := C.tinygo_link_elf(C.int(len(flags)), (**C.char)(buf))
if !ok {
return errors.New("failed to link using built-in ld.lld")
}
return nil
case "wasm-ld":
flags = append([]string{"tinygo:" + linker}, flags...)
var cflag *C.char
buf := C.calloc(C.size_t(len(flags)), C.size_t(unsafe.Sizeof(cflag)))
defer C.free(buf)
cflags := (*[1 << 10]*C.char)(unsafe.Pointer(buf))[:len(flags):len(flags)]
for i, flag := range flags {
cflag := C.CString(flag)
cflags[i] = cflag
defer C.free(unsafe.Pointer(cflag))
}
ok := C.tinygo_link_wasm(C.int(len(flags)), (**C.char)(buf))
if !ok {
return errors.New("failed to link using built-in wasm-ld")
}
return nil
default:
// Fall back to external command.
if cmdNames, ok := commands[linker]; ok {
return execCommand(cmdNames, flags...)
}
cmd := exec.Command(linker, flags...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
}
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