[RFC] [PATCH v3 0/8] [i386] Use out-of-line stubs for ms_abi pro/epilogues

[JonY]

On 02/10/2017 05:23 PM, Daniel Santos wrote:
> On 02/10/2017 05:34 AM, JonY wrote:
>> Hi,
>> mingw-w64 itself does not use any ms_abi/sysv_abi marked functions
>> internally, so it should be unaffected. I don't think Cygwin uses any
>> either, but I need to double check.
> 
> Of course, ms_abi is gcc's default on Windows so it would be sysv_abi
> functions.  I'm *guessing* that just about everything with Cygwin is
> built for Windows, but it would also make sense if (in some odd case) a
> binary built with sysv_abi is used by something and that library or
> program makes the ABI transition when using said hypothetical library. 
> Even in these cases, I would not anticipate a problem, although any use
> of SEH would inhibit the optimization.  Of course, I haven't *tested*
> this, so I'm only speaking from what I know. :)
> 

Cygwin has internal functions marked ms_abi but none with sysv_abi, so
it will be unaffected by this change. Most 64bit mingw-w64 toolchains
are built with SEH for exception handling though, but since it is
disabled, it shouldn't break anything.

If its not too much to ask, please do a gcc build targeting 32bit/64bit
mingw-w64 and Cygwin, it'll make solid evidence that the changes do not
break the compiler.

Thanks.



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