Re: [PATCH] adding missing LTO to some warning options (PR 78606)

[Martin Sebor <msebor at gmail dot com>]

On 01/17/2017 05:04 AM, Kyrill Tkachov wrote:
> Hi Martin,
>
> On 10/01/17 22:16, Martin Sebor wrote:
> > The -Walloca-larger-than, -Wformat-length, and -Wformat-truncation
> > options do not mention LTO among the supported languages and so are
> > disabled when -flto is used, causing false negatives.
> >
> > The attached patch adds the missing LTO to the three options. This
> > makes -Walloca-larger-than work with LTO but not the other two
> > options, implying that something else is preventing the gimple-ssa-
> > sprintf pass from running when -flto is enabled.  I haven't had
> > the cycles to look into what that might be yet.  Since the root
> > causes are independent I'd like to commit this patch first and
> > deal with the  -Wformat-{length,truncation} problem separately,
> > under a new bug (or give someone with a better understanding of
> > LTO the opportunity to do it).
>
> I see the new test FAILing on arm and aarch64 targets.
> FAIL: gcc.dg/pr78768.c execution test

Thanks.  The test doesn't need to run.  It just needs to link.
I changed it in r244537.

Martin