[Bug middle-end/109559] [12/13/14 Regression] Unexpected -Wmaybe-uninitialized warning when inlining with system header

["mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109559

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Unexpected                  |[12/13/14 Regression]
                   |-Wmaybe-uninitialized       |Unexpected
                   |warning when inlining with  |-Wmaybe-uninitialized
                   |system header               |warning when inlining with
                   |                            |system header
           Keywords|                            |diagnostic
   Target Milestone|---                         |12.3

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r12-1992.  

We have an inlining context containing locations for each call site along
the inlining stack: struct inlining_info.  It has a stack of locations,
and a flag that says whether all of them come from a system header.  If so,
we don't warn:

1548   if (!report_warning_p && diagnostic->m_iinfo.m_allsyslocs)
1549     /* Bail if the warning is not to be reported because all locations
1550        in the inlining stack (if there is one) are in system headers.  */
1551     return false;

but in this test diagnostic->m_iinfo.m_allsyslocs is false because the inlining
causes that the outermost context is the un.cc file, which is not a system
header.

It looks like this is a failure to propagate the sysp flag when inlining a
function.