[Bug c++/44878] New: Build fails when compiling libstdc++

[Bug c++/44878] New: Build fails when compiling libstdc++

[sje at cup dot hp dot com]

The patch to PR 44813 broke the build on ia64-hp-hpux11.23.  The patch went in
at r161898.  Attached is a test case which causes an ICE when compiled with GCC
on ia64-hp-hpux11.23.  No options are needed during the compile.  The failure
is:

x.cc: In function 'std::__exception_ptr::exception_ptr
std::current_exception()':
x.cc:19:1: internal compiler error: in emit_move_insn, at expr.c:3397
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

In the debugger I see:

(gdb) p mode
$1 = DImode
(gdb) p debug_rtx(x)
(reg/f:DI 341 [ <retval>+-4 ])
$2 = void
(gdb) p debug_rtx(y)
(subreg/s/v:SI (reg/f:DI 341 [ <retval>+-4 ]) 4)

so the problem is the mismatch in the modes.  IA64 generates 32 bit pointers by
default but they need to be extended to 64 bits before being dereferenced.


-- 
           Summary: Build fails when compiling libstdc++
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sje at cup dot hp dot com
 GCC build triplet: ia64-hp-hpux11.23
  GCC host triplet: ia64-hp-hpux11.23
GCC target triplet: ia64-hp-hpux11.23


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44878

[Bug c++/44878] Build fails when compiling libstdc++

[sje at cup dot hp dot com]

------- Comment #1 from sje at cup dot hp dot com  2010-07-08 21:53 -------
Created an attachment (id=21152)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21152&action=view)
Test case that fails on ia64-hp-hpux11.23

This test case generates an ICE on ia64-hp-hpux11.23.  No options are required
during compile.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44878

[Bug middle-end/44878] [4.6 Regression] Build fails when compiling libstdc++

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c++                         |middle-end
           Keywords|                            |build, ice-on-valid-code
            Summary|Build fails when compiling  |[4.6 Regression] Build fails
                   |libstdc++                   |when compiling libstdc++
   Target Milestone|---                         |4.6.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44878

[Bug middle-end/44878] [4.6 Regression] Build fails when compiling libstdc++

[sje at cup dot hp dot com]

------- Comment #2 from sje at cup dot hp dot com  2010-07-09 16:10 -------
Here is a smaller test case:

class e
    {
      public:
      e(void* __e);
      e(const e&);
    };

void * v() { }
e foo() { return e(v()); }

It only fails on IA64 in 32 bit mode and the problem seems to be related to
the change in needs_to_live_in_memory.  If I undo the one line change in that
function then the example will compile.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44878

[Bug middle-end/44878] [4.6 Regression] Build fails when compiling libstdc++

[sje at gcc dot gnu dot org]

------- Comment #3 from sje at gcc dot gnu dot org  2010-07-22 18:15 -------
Subject: Bug 44878

Author: sje
Date: Thu Jul 22 18:14:27 2010
New Revision: 162423

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=162423
Log:
2010-07-22  Steve Ellcey  <sje@cup.hp.com>

        PR middle-end/44878
        * stmt.c (expand_value_return):  Call promote_function_mode with
        a for_return argument of 2 when returning by reference.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/stmt.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44878

[Bug middle-end/44878] [4.6 Regression] Build fails when compiling libstdc++

[sje at cup dot hp dot com]

------- Comment #4 from sje at cup dot hp dot com  2010-07-22 22:29 -------
Fixed, I can now bootstrap GCC *with partial inlining turned off*.  Partial
inlining still doesn't work on IA64 HP-UX, that problem is PR 44716.


-- 

sje at cup dot hp dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44878