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[Bug lto/70955] [6/7 Regression] Wrong code generation for __builtin_ms_va_list with -flto
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 06 May 2016 07:56:37 +0000
- Subject: [Bug lto/70955] [6/7 Regression] Wrong code generation for __builtin_ms_va_list with -flto
- Auto-submitted: auto-generated
- References: <bug-70955-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70955
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |lto, wrong-code
Priority|P3 |P2
Target Milestone|--- |6.2
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
The change with GCC 6 is that the builtins are now lowered during link-time
optimization rather than at compile-time. Thus the abi selection bits are
possibly not transfered correctly (type merging?). I remember the business
was quite ugly, but eventually we just miss to properly transfer the function
attribute.
Needs more investigation.