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[Bug target/64384] New: mingw-w64: stdcall function returning an aggregate is incompatible with MS ABI
- From: "mity at morous dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 23 Dec 2014 13:39:07 +0000
- Subject: [Bug target/64384] New: mingw-w64: stdcall function returning an aggregate is incompatible with MS ABI
- Auto-submitted: auto-generated
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64384
Bug ID: 64384
Summary: mingw-w64: stdcall function returning an aggregate is
incompatible with MS ABI
Product: gcc
Version: 4.9.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: mity at morous dot org
When using COM interface (i.e. calling stdcall function/method), aggregates are
returned through an implicit parameter after the this/interface pointer,
according to MS ABI. However it is not so when using gcc.
This issue manifests itself when e.g. calling ID2D1RenderTarget::GetSize() from
<d2d1.h> as discussed here:
https://sourceforge.net/p/mingw-w64/mailman/mingw-w64-public/?style=threaded&viewmonth=201412&viewday=23
Wine team encountered the issue too, they seem to "solve" the issue on their
side by ugly hacks and changing prototypes of the relevant functions for now:
https://www.winehq.org/pipermail/wine-patches/2014-September/134351.html