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Re: [RFC] COMDAT Safe Module Level Multi versioning

From: Sriraman Tallam <tmsriram at google dot com>
To: Cary Coutant <ccoutant at gmail dot com>
Cc: Xinliang David Li <davidxl at google dot com>, Richard Biener <richard dot guenther at gmail dot com>, "H.J. Lu" <hjl dot tools at gmail dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>, binutils <binutils at sourceware dot org>, Yury Gribov <y dot gribov at samsung dot com>
Date: Wed, 2 Sep 2015 16:32:21 -0700
Subject: Re: [RFC] COMDAT Safe Module Level Multi versioning
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On Tue, Aug 18, 2015 at 9:46 PM, Cary Coutant <ccoutant@gmail.com> wrote:
>> Thanks, will make those changes.  Do you recommend a different name
>> for this flag like -fmake-comdat-functions-static?
>
> Well, the C++ ABI refers to this as "vague linkage." It may be a bit
> too long or too ABI-specific, but maybe something like
> -f[no-]use-vague-linkage-for-functions or
> -f[no-]functions-vague-linkage?

Done and patch attached.

* c-family/c.opt (fvague-linkage-functions): New option.
* cp/decl2.c (comdat_linkage): Implement new option.  Warn when
virtual comdat functions are seen.
* ipa.c (function_and_variable_visibility): Check for no vague
linkage.
* doc/invoke.texi: Document new option.
* testsuite/g++.dg/no-vague-linkage-functions-1.C: New test.

>
> And perhaps note in the doc that using this option may technically
> break the C++ ODR, so it should be used only when you know what you're
> doing.

Done.

Thanks
Sri

>
> -cary

Attachment: no_vague_linkage_functions.txt
Description: Text document

Follow-Ups:
- Re: [RFC] COMDAT Safe Module Level Multi versioning
  - From: Sriraman Tallam

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