[Bug c++/42070] New: FAIL: g++.dg/tree-prof/partition1.C compilation, -O3 -g -fprofile-use

[Bug c++/42070] New: FAIL: g++.dg/tree-prof/partition1.C compilation, -O3 -g -fprofile-use

[howarth at nitro dot med dot uc dot edu]

Currently in gcc trunk on darwin10, we fail the test cases...

FAIL: g++.dg/tree-prof/partition1.C compilation,  -g  -fprofile-use
UNRESOLVED: g++.dg/tree-prof/partition1.C execution,    -g  -fprofile-use

FAIL: g++.dg/tree-prof/partition1.C compilation,  -O3 -g  -fprofile-use
UNRESOLVED: g++.dg/tree-prof/partition1.C execution,    -O3 -g  -fprofile-use

when compiling with -freorder-blocks-and-partition on darwin10 because of many
warnings of the form...

ld: warning: can't add line info to anonymous symbol anon-func-0xF40 from
/var/tmp//ccrw73YL.o

This was filed as radar 7289379 with the two failing test cases provided as
samples of the problem. Apple's response was...

"In the sample you supplied, the warning is because there is code in the
__TEXT/__unlikely section and there is dwarf debug information that says it
part of a function.  The linker sanity checks how it broke up the .o file into
"atoms"  by checking it against the dwarf debug info.  

I think the __unlikely section should be avoided on darwin until it is shown to
work with the linker.  At a minimum each chunk in the __unlikely section should
have a label on it with a name based on the function it came from.  Those
labels would also help debugging.

This warning does not have anything to do removing labels from __eh_frame
section."


-- 
           Summary: FAIL: g++.dg/tree-prof/partition1.C compilation,  -O3 -g
                    -fprofile-use
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: howarth at nitro dot med dot uc dot edu
 GCC build triplet: *-apple-darwin10
  GCC host triplet: *-apple-darwin10
GCC target triplet: *-apple-darwin10


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42070

[Bug target/42070] FAIL: g++.dg/tree-prof/partition1.C compilation, -O3 -g -fprofile-use

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2009-11-16 20:02 -------
Basically I think breaking up functions inside sections/segments in object
files is a broken way of doing dead stripping.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42070

[Bug target/42070] FAIL: g++.dg/tree-prof/partition1.C compilation, -O3 -g -fprofile-use

[iains at gcc dot gnu dot org]

------- Comment #2 from iains at gcc dot gnu dot org  2010-04-06 20:53 -------
(In reply to comment #1)
> Basically I think breaking up functions inside sections/segments in object
> files is a broken way of doing dead stripping.

hmm I think this is related to hot/cold partitioning rather than dead code
stripping, per se.  
I wonder if it's partial fallout from not being able to use dwarf >2.
 ( I seem to recall that the problem area in dwarf2out was around the hot/cold
sections).


-- 

iains at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |iains at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42070

[Bug target/42070] FAIL: g++.dg/tree-prof/partition1.C compilation, -O3 -g -fprofile-use

[howarth at nitro dot med dot uc dot edu]

------- Comment #3 from howarth at nitro dot med dot uc dot edu  2010-09-09 17:19 -------
Created an attachment (id=21755)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21755&action=view)
patch to prune bogus linker warnings from Xcode 3.2.x.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42070

[Bug target/42070] FAIL: g++.dg/tree-prof/partition1.C compilation, -O3 -g -fprofile-use

[bonzini at gcc dot gnu dot org]

------- Comment #4 from bonzini at gnu dot org  2010-09-14 07:41 -------
Subject: Bug 42070

Author: bonzini
Date: Tue Sep 14 07:40:44 2010
New Revision: 164269

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=164269
Log:
2010-09-10  Jack Howarth <howarth@bromo.med.uc.edu>

        PR target/42070
        * gcc/testsuite/lib/profopt.exp: Prune warnings on execname2 compile.
        * gcc/testsuite/lib/prune.exp: Prune "can't add line info" warnings.


Modified:
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/lib/profopt.exp
    trunk/gcc/testsuite/lib/prune.exp


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42070

[Bug target/42070] FAIL: g++.dg/tree-prof/partition1.C compilation, -O3 -g -fprofile-use

[mrs at gcc dot gnu dot org]

------- Comment #5 from mrs at gcc dot gnu dot org  2010-09-15 07:55 -------
Fixed.


-- 

mrs at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42070

[Bug target/42070] FAIL: g++.dg/tree-prof/partition1.C compilation, -O3 -g -fprofile-use

[mrs at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42070

mrs@gcc.gnu.org <mrs at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mrs at gcc dot gnu.org
   Target Milestone|---                         |4.5.2

[Bug target/42070] FAIL: g++.dg/tree-prof/partition1.C compilation, -O3 -g -fprofile-use

[mrs at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42070

--- Comment #6 from mrs at gcc dot gnu.org <mrs at gcc dot gnu.org> 2010-10-06 19:22:40 UTC ---
Author: mrs
Date: Wed Oct  6 19:22:37 2010
New Revision: 165063

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=165063
Log:
2010-10-06  Jack Howarth <howarth@bromo.med.uc.edu>

    Backport from mainline
    2010-09-10  Jack Howarth <howarth@bromo.med.uc.edu>

    PR target/42070
    * lib/profopt.exp: Prune warnings on execname2 compile.
    * lib/prune.exp: Prune "can't add line info" warnings.

Modified:
    branches/gcc-4_5-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_5-branch/gcc/testsuite/lib/profopt.exp
    branches/gcc-4_5-branch/gcc/testsuite/lib/prune.exp