runtime_os_darwin_print_bsdthread_register_error.patch

gistfile1.txt

diff --git a/src/runtime/os_darwin.go b/src/runtime/os_darwin.go
index 1528167..edcb512 100644
--- a/src/runtime/os_darwin.go
+++ b/src/runtime/os_darwin.go
@@ -101,7 +101,8 @@ func goenvs() {
 	// but only if we're not using cgo. If we are using cgo we need
 	// to let the C pthread library install its own thread-creation callback.
 	if !iscgo {
-		if bsdthread_register() != 0 {
+		if r := bsdthread_register(); r != 0 {
+			println("bsdthread_register returns", r)
 			if gogetenv("DYLD_INSERT_LIBRARIES") != "" {
 				throw("runtime: bsdthread_register error (unset DYLD_INSERT_LIBRARIES)")
 			}