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Re: [PATCH 1/2] libdw: ensure read_encoded_value's value is set
- From: Josh Stone <jistone at redhat dot com>
- To: elfutils-devel at lists dot fedorahosted dot org
- Date: Thu, 12 Feb 2015 18:16:34 -0800
- Subject: Re: [PATCH 1/2] libdw: ensure read_encoded_value's value is set
On 02/12/2015 03:32 AM, Mark Wielaard wrote:
> On Thu, 2015-02-12 at 00:22 +0100, Petr Machata wrote:
>> Josh Stone <email@example.com> writes:
>>> With CFLAGS='-Og -g', F21 gcc hits -Werror=maybe-uninitialized in
>>> read_encoded_value at "*result += value". It's fine with -O2/-O0.
>>> By my inspection, the only way those don't set value are for error
>>> cases, which will then return immediately.
>> Looks good to me. I don't see how we could end up using value
>> uninitialized either, but oh well.
> Agreed. In general I don't like working around limitations in the
> compiler not correctly deducing things like this. Especially since it
> does seem to figure things out fine with -O0/-O2. But in both this case
> and the test case the explicit initialization seems harmless/not on a
> critical path. And it is nice to have -Og work for those that want to
> use it.
Thanks, both are pushed now.