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package builder
import (
"errors"
"fmt"
"os/exec"
"runtime"
"strings"
"tinygo.org/x/go-llvm"
)
// Commands lists command alternatives for various operating systems. These
// commands may have a slightly different name across operating systems and
// distributions or may not even exist in $PATH, in which case absolute paths
// may be used.
var commands = map[string][]string{}
func init() {
llvmMajor := strings.Split(llvm.Version, ".")[0]
commands["clang"] = []string{"clang-" + llvmMajor}
commands["ld.lld"] = []string{"ld.lld-" + llvmMajor, "ld.lld"}
commands["wasm-ld"] = []string{"wasm-ld-" + llvmMajor, "wasm-ld"}
commands["lldb"] = []string{"lldb-" + llvmMajor, "lldb"}
// Add the path to a Homebrew-installed LLVM for ease of use (no need to
// manually set $PATH).
if runtime.GOOS == "darwin" {
var prefix string
switch runtime.GOARCH {
case "amd64":
prefix = "/usr/local/opt/llvm@" + llvmMajor + "/bin/"
case "arm64":
prefix = "/opt/homebrew/opt/llvm@" + llvmMajor + "/bin/"
default:
// unknown GOARCH
panic(fmt.Sprintf("unknown GOARCH: %s on darwin", runtime.GOARCH))
}
commands["clang"] = append(commands["clang"], prefix+"clang-"+llvmMajor)
commands["ld.lld"] = append(commands["ld.lld"], prefix+"ld.lld")
commands["wasm-ld"] = append(commands["wasm-ld"], prefix+"wasm-ld")
commands["lldb"] = append(commands["lldb"], prefix+"lldb")
}
// Add the path for when LLVM was installed with the installer from
// llvm.org, which by default doesn't add LLVM to the $PATH environment
// variable.
if runtime.GOOS == "windows" {
commands["clang"] = append(commands["clang"], "clang", "C:\\Program Files\\LLVM\\bin\\clang.exe")
commands["ld.lld"] = append(commands["ld.lld"], "lld", "C:\\Program Files\\LLVM\\bin\\lld.exe")
commands["wasm-ld"] = append(commands["wasm-ld"], "C:\\Program Files\\LLVM\\bin\\wasm-ld.exe")
commands["lldb"] = append(commands["lldb"], "C:\\Program Files\\LLVM\\bin\\lldb.exe")
}
// Add the path to LLVM installed from ports.
if runtime.GOOS == "freebsd" {
prefix := "/usr/local/llvm" + llvmMajor + "/bin/"
commands["clang"] = append(commands["clang"], prefix+"clang-"+llvmMajor)
commands["ld.lld"] = append(commands["ld.lld"], prefix+"ld.lld")
commands["wasm-ld"] = append(commands["wasm-ld"], prefix+"wasm-ld")
commands["lldb"] = append(commands["lldb"], prefix+"lldb")
}
}
// LookupCommand looks up the executable name for a given LLVM tool such as
// clang or wasm-ld. It returns the (relative) command that can be used to
// invoke the tool or an error if it could not be found.
func LookupCommand(name string) (string, error) {
for _, cmdName := range commands[name] {
_, err := exec.LookPath(cmdName)
if err != nil {
if errors.Unwrap(err) == exec.ErrNotFound {
continue
}
return cmdName, err
}
return cmdName, nil
}
return "", errors.New("none of these commands were found in your $PATH: " + strings.Join(commands[name], " "))
}
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