[Bug bootstrap/37441] New: [4.4 regression] dwarf2 unwind info patches produce undefined symbols

[Bug bootstrap/37441] New: [4.4 regression] dwarf2 unwind info patches produce undefined symbols

[ro at gcc dot gnu dot org]

Between 20080801 and 20080903, mainline bootstrap started to fail on IRIX 6.5.
The symptom is a configuration failure when configuring stage2 support
libraries
like zlib:

checking whether the 
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/xgcc
-B/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/
-B/vol/gcc/mips-sgi-irix6.5/bin/ linker (/usr/bin/ld -n32) supports shared
libraries... configure: error: Link tests are not allowed after
GCC_NO_EXECUTABLES.
make[2]: *** [configure-stage2-zlib]

>From zlib/config.log, it seems like the checking for suffix of executables test
fails:

configure:2484:  /vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/xgcc
-B/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/
-B/vol/gcc/mips-sgi-irix6.5/bin/ -o conftest -g -O2   conftest.c  >&5
ld32: ERROR   33 : Unresolved data symbol ".LSFDE0" -- 1st referenced by
/var/tmp//ccrBXRSg.o.
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE2" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE4" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE6" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE8" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE10" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE12" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE14" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE16" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE18" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE20" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE22" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE24" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE26" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE28" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE30" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE32" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE34" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE36" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE38" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE40" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE42" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: ERROR   33 : Unresolved data symbol ".LSFDE44" -- 1st referenced by
/vol/gccsrc/obj/gcc-4.4.0-20080903/6.5-gcc/./prev-gcc/libgcc_eh.a(unwind-dw2-fde.o).
        Use linker option -v to see when and which objects, archives and dsos
are loaded.  
ld32: INFO    152: Output file removed because of error.
collect2: ld returned 2 exit status
configure:2487: $? = 1

With the following conftest.c

int
main ()
{

  ;
  return 0;
}

gcc -g -O2   conftest.c -v -save-temps -dA -fverbose-asm

works successfully as of 20080801, while the 20080903 version fails to link as
above.  It turns out that both .s files contain a reference to the .LSFDE0
label (from DW_AT_MIPS_fde), but the definition is lost.  I've included both .s
files
for reference.  With -fno-dwarf2-cfi-asm, the problem is gone in conftest.s,
but of course the undefined .LSFDE* symbols in libgcc_eh.a remain.


-- 
           Summary: [4.4 regression] dwarf2 unwind info patches produce
                    undefined symbols
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ro at gcc dot gnu dot org
 GCC build triplet: mips-sgi-irix6.5
  GCC host triplet: mips-sgi-irix6.5
GCC target triplet: mips-sgi-irix6.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37441

[Bug bootstrap/37441] [4.4 regression] dwarf2 unwind info patches produce undefined symbols

[ro at gcc dot gnu dot org]

------- Comment #1 from ro at gcc dot gnu dot org  2008-09-09 12:54 -------
Created an attachment (id=16264)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16264&action=view)
working version of conftest.s


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37441

[Bug bootstrap/37441] [4.4 regression] dwarf2 unwind info patches produce undefined symbols

[ro at gcc dot gnu dot org]

------- Comment #2 from ro at gcc dot gnu dot org  2008-09-09 12:54 -------
Created an attachment (id=16265)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16265&action=view)
broken version of conftest.s


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37441

[Bug bootstrap/37441] [4.4 regression] dwarf2 unwind info patches produce undefined symbols

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org
   Target Milestone|---                         |4.4.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37441

[Bug bootstrap/37441] [4.4 regression] dwarf2 unwind info patches produce undefined symbols

[jakub at gcc dot gnu dot org]

------- Comment #3 from jakub at gcc dot gnu dot org  2008-09-10 06:35 -------
There is no way to reference start of FDE when using .cfi_* directives, so
#ifdef MIPS_DEBUGGING_INFO
      /* Add a reference to the FDE for this routine.  */
      add_AT_fde_ref (subr_die, DW_AT_MIPS_fde, current_funcdef_fde);
#endif
references undefined label.  I'm afraid at least until some support is added to
gas to handle that, we should:
#ifdef MIPS_DEBUGGING_INFO
  return false;
#endif
early in dwarf2out_do_cfi_asm.  Wonder why alpha defines MIPS_DEBUGGING_INFO
too
and if e.g. alpha-linux needs to emit DW_AT_MIPS_fde attributes.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37441

[Bug bootstrap/37441] [4.4 regression] dwarf2 unwind info patches produce undefined symbols

[ro at techfak dot uni-bielefeld dot de]

------- Comment #4 from ro at techfak dot uni-bielefeld dot de  2008-09-11 11:23 -------
Subject: Re:  [4.4 regression] dwarf2 unwind info patches produce undefined
symbols

jakub at gcc dot gnu dot org writes:

> references undefined label.  I'm afraid at least until some support is added to
> gas to handle that, we should:
> #ifdef MIPS_DEBUGGING_INFO
>   return false;
> #endif
> early in dwarf2out_do_cfi_asm.  Wonder why alpha defines MIPS_DEBUGGING_INFO
> too
> and if e.g. alpha-linux needs to emit DW_AT_MIPS_fde attributes.

The following patch

Index: gcc/dwarf2out.c
===================================================================
--- gcc/dwarf2out.c     (revision 140226)
+++ gcc/dwarf2out.c     (working copy)
@@ -139,6 +139,9 @@ dwarf2out_do_cfi_asm (void)

   if (!flag_dwarf2_cfi_asm || !dwarf2out_do_frame ())
     return false;
+#ifdef MIPS_DEBUGGING_INFO
+  return false;
+#endif
   if (!eh_personality_libfunc)
     return true;
   if (!HAVE_GAS_CFI_PERSONALITY_DIRECTIVE)

allowed for the bootstrap to complete.  The testsuite is still running;
when it's done, I'll submit it to gcc-patches.

        Rainer


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37441

[Bug bootstrap/37441] [4.4 regression] dwarf2 unwind info patches produce undefined symbols

[ro at techfak dot uni-bielefeld dot de]

------- Comment #5 from ro at techfak dot uni-bielefeld dot de  2008-09-12 18:47 -------
Subject: Re:  [4.4 regression] dwarf2 unwind info patches produce undefined
symbols

Patch here:

        http://gcc.gnu.org/ml/gcc-patches/2008-09/msg00978.html


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37441

[Bug bootstrap/37441] [4.4 regression] dwarf2 unwind info patches produce undefined symbols

[ro at gcc dot gnu dot org]

------- Comment #7 from ro at gcc dot gnu dot org  2008-09-17 12:28 -------
Subject: Bug 37441

Author: ro
Date: Wed Sep 17 12:26:43 2008
New Revision: 140417

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=140417
Log:
        PR bootstrap/37441
        * dwarf2out.c (dwarf2out_do_cfi_asm) [MIPS_DEBUGGING_INFO]: Return
        false.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/dwarf2out.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37441

[Bug bootstrap/37441] [4.4 regression] dwarf2 unwind info patches produce undefined symbols

[ro at gcc dot gnu dot org]

------- Comment #6 from ro at gcc dot gnu dot org  2008-09-17 12:28 -------
Fixed for 4.4.0.


-- 

ro at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37441