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Re: gcc: optimizations, and stack traces
Le 09/02/2018 à 12:13, Valery Ushakov a écrit :
On Fri, Feb 09, 2018 at 11:23:17 +0100, Maxime Villard wrote:
There are also several cases where functions in the call tree can disappear
from the backtrace. In the following call tree:
A -> B -> C -> D (and D panics)
if, in B, GCC put the two instructions after the instruction that calls C,
the backtrace will be:
A -> C -> D
This can make a bug completely undebuggable.
Does gcc actually generates code like that? I thought that it can
delay frame pointer creation, but only until it needs to make a nested
call, to C in your example, (as in the sample I showed in another mail
to this thread).
Mmh, now I'm not so sure about this. Wait a minute, I'll re-give a look and
try to understand what I was doing.
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