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libgo patch committed: Don't crash if missing debug info in runtime.Callers

From: Ian Lance Taylor <iant at golang dot org>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>, "gofrontend-dev at googlegroups dot com" <gofrontend-dev at googlegroups dot com>
Date: Fri, 23 Jan 2015 11:50:14 -0800
Subject: libgo patch committed: Don't crash if missing debug info in runtime.Callers
Authentication-results: sourceware.org; auth=none

This patch to libgo avoids crashing if there is no debug info when
calling runtime.Callers.  This is particularly useful because memory
profiling, which is on at a low rate by default, will call
runtime.Callers even though the program itself does not call it.  This
addresses part of GCC PR 64595.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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