doc/debugging_with_gdb: mention how to disable gc optimization
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6353055
diff --git a/doc/debugging_with_gdb.html b/doc/debugging_with_gdb.html
index b268391..6b1e253 100644
--- a/doc/debugging_with_gdb.html
+++ b/doc/debugging_with_gdb.html
@@ -23,6 +23,14 @@
(for example, <code>go build -ldflags "-s" prog.go</code>).
</p>
+<p>
+The code generated by the <code>gc</code> compiler includes inlining of
+function invocations and registerization of variables. These optimizations
+can sometimes make debugging with <code>gdb</code> harder. To disable them
+when debugging, pass the flags <code>-gcflags "-N -l"</code> to the
+<a href="/cmd/go"><code>go</code></a> command used to build the code being
+debugged.
+</p>
<h3 id="Common_Operations">Common Operations</h3>
