b6db84e916
Be more compatible with the Go toolchain by setting GOPATH in the same way. This makes it possible to flash and run examples from the standard GOPATH instead of only from the source tree.
81 строка
2,1 КиБ
Go
81 строка
2,1 КиБ
Go
package main
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import (
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"encoding/json"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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)
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// Target specification for a given target. Used for bare metal targets.
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//
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// The target specification is mostly inspired by Rust:
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// https://doc.rust-lang.org/nightly/nightly-rustc/rustc_target/spec/struct.TargetOptions.html
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// https://github.com/shepmaster/rust-arduino-blink-led-no-core-with-cargo/blob/master/blink/arduino.json
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type TargetSpec struct {
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Triple string `json:"llvm-target"`
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BuildTags []string `json:"build-tags"`
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Linker string `json:"linker"`
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PreLinkArgs []string `json:"pre-link-args"`
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Objcopy string `json:"objcopy"`
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Flasher string `json:"flash"`
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}
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// Load a target specification
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func LoadTarget(target string) (*TargetSpec, error) {
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spec := &TargetSpec{
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Triple: target,
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BuildTags: []string{runtime.GOOS, runtime.GOARCH},
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Linker: "cc",
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PreLinkArgs: []string{"-no-pie"}, // WARNING: clang < 5.0 requires -nopie
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Objcopy: "objcopy",
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}
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// See whether there is a target specification for this target (e.g.
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// Arduino).
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path := filepath.Join(sourceDir(), "targets", strings.ToLower(target)+".json")
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if fp, err := os.Open(path); err == nil {
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defer fp.Close()
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err := json.NewDecoder(fp).Decode(spec)
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if err != nil {
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return nil, err
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}
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} else if !os.IsNotExist(err) {
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// Expected a 'file not found' error, got something else.
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return nil, err
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} else {
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// No target spec available. This is fine.
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}
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return spec, nil
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}
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// Return the source directory of this package, or "." when it cannot be
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// recovered.
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func sourceDir() string {
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// https://stackoverflow.com/a/32163888/559350
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_, path, _, _ := runtime.Caller(0)
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return filepath.Dir(path)
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}
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func getGopath() string {
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gopath := os.Getenv("GOPATH")
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if gopath != "" {
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return gopath
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}
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// fallback
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var home string
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if runtime.GOOS == "windows" {
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home = os.Getenv("USERPROFILE")
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} else {
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home = os.Getenv("HOME")
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}
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if home == "" {
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// This is very unlikely, so panic here.
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// Not the nicest solution, however.
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panic("no $HOME or %USERPROFILE% found")
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}
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return filepath.Join(home, "go")
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}
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