[Bug target/38952] New: [4.4 Regression] EH does not work.

[dave dot korn dot cygwin at gmail dot com]

SjLj EH (the default) is completely broken on Cygwin (and MinGW, confirmed by
Danny in private email).

  The failures have been occurring since at least November: see, e.g.
http://gcc.gnu.org/ml/gcc-testresults/2008-11/msg02144.html

(The distro maintainers have all been so focussed recently on getting DW2 EH to
work on our platforms that this flew in under our radar; sorry for not noticing
sooner).

  A simple test case and some complicated low-level analysis will follow in
comments and attachments.  So far it looks like an error in frame pointer
elimination caused by a miscalculation of the initial frame pointer offset.  I
have filed this as a target problem since elimination is driven by the backend
but it could just as well be a bug in rtl-optimisation; we'll know more soon.

  cheers,
    DaveK


-- 
           Summary: [4.4 Regression] EH does not work.
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: blocker
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dave dot korn dot cygwin at gmail dot com
 GCC build triplet: i686-pc-cygwin
  GCC host triplet: i686-pc-cygwin
GCC target triplet: i686-pc-cygwin


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38952