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cmd/go: clean cgo compiler errors

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Cut out temporary cgo file in error message.
Show C.foo instead of _Ctype_foo.

Before:
x.go:20[/var/folders/00/05_b8000h01000cxqpysvccm000n9d/T/go-build242036121/command-line-arguments/_obj/x.cgo1.go:19]: cannot use tv.Usec (type int32) as type _Ctype___darwin_suseconds_t in assignment

After:
x.go:20: cannot use tv.Usec (type int32) as type C.__darwin_suseconds_t in assignment

Fixes #4255.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7231075
This commit is contained in:
Russ Cox 2013-02-01 08:34:21 -08:00
parent f20e3a1065
commit 32a6097fde
1 changed files with 15 additions and 4 deletions
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19
src/cmd/go/build.go
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@ -814,11 +814,11 @@ func (b *builder) build(a *action) (err error) {
// Compile Go.
if len(gofiles) > 0 {
if out, err := buildToolchain.gc(b, a.p, obj, inc, gofiles); err != nil {
out, err := buildToolchain.gc(b, a.p, obj, inc, gofiles)
if err != nil {
return err
} else {
objects = append(objects, out)
}
objects = append(objects, out)
}
// Copy .h files named for goos or goarch or goos_goarch
@ -1177,6 +1177,8 @@ func relPaths(paths []string) []string {
// print this error.
var errPrintedOutput = errors.New("already printed output - no need to show error")
var cgoLine = regexp.MustCompile(`\[[^\[\]]+\.cgo1\.go:[0-9]+\]`)
// run runs the command given by cmdline in the directory dir.
// If the command fails, run prints information about the failure
// and returns a non-nil error.
@ -1189,7 +1191,16 @@ func (b *builder) run(dir string, desc string, cmdargs ...interface{}) error {
if desc == "" {
desc = b.fmtcmd(dir, "%s", strings.Join(stringList(cmdargs...), " "))
}
b.showOutput(dir, desc, string(out))
out := string(out)
// Fix up output referring to cgo-generated code to be more readable.
// Replace x.go:19[/tmp/.../x.cgo1.go:18] with x.go:19.
// Replace _Ctype_foo with C.foo.
// If we're using -x, assume we're debugging and want the full dump, so disable the rewrite.
if !buildX && cgoLine.MatchString(out) {
out = cgoLine.ReplaceAllString(out, "")
out = strings.Replace(out, "type _Ctype_", "type C.", -1)
}
b.showOutput(dir, desc, out)
if err != nil {
err = errPrintedOutput
}