[hellogcc] Re: Why GDB fails to connect on first attempt and always succeed on second
- From: Yao Qi <qiyaoltc@xxxxxxxxx>
- To: hellogcc@xxxxxxxxxxxxx
- Date: Wed, 12 Dec 2012 10:26:59 +0800
第一次失败的：
On 12/12/2012 09:47 AM, Li Bingqiu wrote:
(gdb) target remote :1234
Remote debugging using :1234
Sending packet: $qSupported#37...Sending packet:
$qSupported#37...Sending packet: $qSupported#37...Ack
这里不对。 gdb 莫名其妙的连续发出了三个qSupported packet，一般情况
下，GDB在target remote 的时候，只用发出一个qSupported packet，参见你第二
次成功的output。
Packet received:
PacketSize=7cf;QPassSignals+;qXfer:libraries:read+;qXfer:auxv:read+;qXfer:features:read+
Packet qSupported (supported-packets) is supported
Sending packet: $qXfer:features:read:target.xml:0,7ca#46...Ack
Packet received:
PacketSize=7cf;QPassSignals+;qXfer:libraries:read+;qXfer:auxv:read+;qXfer:features:read+
Unknown remote qXfer reply:
PacketSize=7cf;QPassSignals+;qXfer:libraries:read+;qXfer:auxv:read+;qXfer:features:read+
前边的三个qSupported packet，导致后边的packet都乱了，所以这里报错了。
如果你们可以更换gdb，那就更新到最新的gdb （6.8有点太旧了），如果还有问
题，去sourcware bugzilla 开bug，到时候会有人去fix。 不过你们不能更换
gdb，那就自己fix吧。看看 remote.c:remote_query_supported 的代码。 Good
luck!
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