[Ping] Re: [C++ Patch/RFC] PR 53184

[Paolo Carlini <paolo.carlini@oracle.com>]

Hi,

On 05/05/2015 11:24 PM, Paolo Carlini wrote:
> Hi,
>
> per the audit trail, this issue appears to boil down to two separate 
> issues:
> - The warning doesn't appear universally useful, thus it would be nice 
> to give it a name in order to enable disabling it.
> - As shown by the testcase, sometimes the wording is misleading: it 
> talks about 'anonymous namespace', where, as clarified by Jason in the 
> trail, the issue is really about a type with no linkage, no namespace 
> involved.
>
> - The former is easy done, I picked: -Wsubobject-linkage. Makes sense?
> - The latter is a little more tricky, because it doesn't seem always 
> easy to tell one case from the other, in particular when templates are 
> involved (eg, g++.dg/warn/anonymous-namespace-3.C) and the linkage 
> issue involves template arguments. Given that the warning doesn't seem 
> terribly important (as another data point, clang doesn't have it), so 
> far I have conditionals which reliably figure out cases of anonymous 
> namespace and cases of no linkage (per the testcase at issue, for 
> example) and otherwise fall back to an 'or' wording. I hope the 
> improvement is good enough. Alternately, I suppose the warning could 
> use a completely different, more generic, wording, but in that case 
> testcases like anonymous-namespace-3.C will need adjustment.
Any feedback on this?

     https://gcc.gnu.org/ml/gcc-patches/2015-05/msg00370.html

Thanks!
Paolo.