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Re: [RFC] COMDAT Safe Module Level Multi versioning

On Tue, Aug 18, 2015 at 9:46 PM, Cary Coutant <> 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
* 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.



> -cary

Attachment: no_vague_linkage_functions.txt
Description: Text document

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