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package main
import (
"errors"
"os"
"os/exec"
"runtime"
"strings"
)
// Commands used by the compilation process might have different file names
// across operating systems and distributions.
var commands = map[string][]string{
"clang": {"clang-8"},
"ld.lld": {"ld.lld-8", "ld.lld"},
"wasm-ld": {"wasm-ld-8", "wasm-ld"},
}
func init() {
// Add the path to a Homebrew-installed LLVM 8 for ease of use (no need to
// manually set $PATH).
if runtime.GOOS == "darwin" {
commands["clang"] = append(commands["clang"], "/usr/local/opt/llvm/bin/clang-8")
commands["ld.lld"] = append(commands["ld.lld"], "/usr/local/opt/llvm/bin/ld.lld")
commands["wasm-ld"] = append(commands["wasm-ld"], "/usr/local/opt/llvm/bin/wasm-ld")
}
// 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")
}
}
func execCommand(cmdNames []string, args ...string) error {
for _, cmdName := range cmdNames {
cmd := exec.Command(cmdName, args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err := cmd.Run()
if err != nil {
if err, ok := err.(*exec.Error); ok && (err.Err == exec.ErrNotFound || err.Err.Error() == "file does not exist") {
// this command was not found, try the next
continue
}
return err
}
return nil
}
return errors.New("none of these commands were found in your $PATH: " + strings.Join(cmdNames, " "))
}
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