cmd/go: add comment about SIGUSR2 on iOS

Missing from CL 34926.

Change-Id: I4a046440c30811f26da53bee0e853dae3b0ac57a
Reviewed-on: https://go-review.googlesource.com/35123
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/cmd/go/test.go b/src/cmd/go/test.go
index 1ff02a68e1a2f540a9865d2725a217754128b1e5..f477a4a253ebe3fe93990b59b2d6338701b87326 100644 (file)
--- a/src/cmd/go/test.go
+++ b/src/cmd/go/test.go
@@ -1531,6 +1531,10 @@ func coverRegisterFile(fileName string, counter []uint32, pos []uint32, numStmts
 
 func main() {
 {{if .IsIOS}}
+       // Send a SIGUSR2, which will be intercepted by LLDB to
+       // tell the test harness that installation was successful,
+       // and to give the exec script a chance set the current
+       // working directory. See misc/ios/go_darwin_arm_exec.go.
        signal.Notify(make(chan os.Signal), syscall.SIGUSR2)
        syscall.Kill(0, syscall.SIGUSR2)
        signal.Reset(syscall.SIGUSR2)