[Bug ld/7027] 64-bit libstdc++.so fails to link on Solaris 11/SPARC: could not read symbols: Bad value

[ro at TechFak dot Uni-Bielefeld dot DE]

------- Additional Comments From ro at TechFak dot Uni-Bielefeld dot DE  
2008-11-14 15:09 -------
Subject: Re:  64-bit libstdc++.so fails to link on Solaris 11/SPARC: could not 
read symbols: Bad value

Hi Nick,

> As a matter of interest if you change this to:
>
>    if ((! ABI_64_P (abfd) && ELF32_R_TYPE (rel->r_info) == R_SPARC_PLT32)
>     || (ABI_64_P (abfd) && ELF32_R_TYPE (rel->r_info) == R_SPARC_WPLT30))
>
> does the patch then work ?  (I agree that the 32-bit case does seem
> rather mysterious).

unfortunately not: this time ld SEGVs:

/vol/gcc/obj/binutils-2.19.50-g/ld/ld-new: warning: section `.bss' type changed 
to PROGBITS
/vol/gcc/obj/binutils-2.19.50-g/ld/ld-new: BFD (GNU Binutils) 2.19.50.20081111 
assertion fail /vol/gnu/src/binutils/binutils-dist/bfd/elfxx-sparc.c:2765
Segmentation Fault

#0  0x00091024 in _bfd_sparc_elf_relocate_section (output_bfd=0x1c5f10, 
info=0x19da08, input_bfd=0x1dc5a0, input_section=0x1f6ab0, contents=0x1082948 
"address@hidden", relocs=0x1fdca0, local_syms=0x753920, 
local_sections=0xfa3c98) at 
/vol/gnu/src/binutils/binutils-dist/bfd/elfxx-sparc.c:2768
#1  0x000d4b9c in elf_link_input_bfd (finfo=0xffbfe880, input_bfd=0x1dc5a0) at 
/vol/gnu/src/binutils/binutils-dist/bfd/elflink.c:9327
#2  0x000d7f84 in bfd_elf_final_link (abfd=0x1c5f10, info=0x19da08) at 
/vol/gnu/src/binutils/binutils-dist/bfd/elflink.c:10452
#3  0x00040958 in ldwrite () at 
/vol/gnu/src/binutils/binutils-dist/ld/ldwrite.c:567
#4  0x0003cec0 in main (argc=114, argv=0xffbfea7c) at 
/vol/gnu/src/binutils/binutils-dist/ld/ldmain.c:462

At l. 2768 of elfxx-sparc.c (_bfd_sparc_elf_relocate_section), h is NULL,
so

          if (h->plt.offset == (bfd_vma) -1 || htab->splt == NULL)
            {
              /* We didn't make a PLT entry for this symbol.  This
                 happens when statically linking PIC code, or when
                 using -Bsymbolic.  */
              break;
            }

crashes when dereferencing it.

If I adapt the check immediately before

@@ -2751,19 +2751,12 @@
          /* Relocation is to the entry for this symbol in the
             procedure linkage table.  */

-         if (! ABI_64_P (output_bfd))
-           {
-             /* The Solaris native assembler will generate a WPLT30 reloc
-                for a local symbol if you assemble a call from one
-                section to another when using -K pic.  We treat it as
-                WDISP30.  */
-             if (h == NULL)
-               break;
-           }
-         else
-           {
-             BFD_ASSERT (h != NULL);
-           }
+         /* The Solaris native assembler will generate a WPLT30 reloc
+            for a local symbol if you assemble a call from one
+            section to another when using -K pic.  We treat it as
+            WDISP30.  */
+         if (h == NULL)
+           break;

          if (h->plt.offset == (bfd_vma) -1 || htab->splt == NULL)
            {

I still get the "section `.bss' type changed to PROGBITS" warning, but at
least a libstdc++.so is produced.

I'm now continuting the GCC bootstrap and will run the testsuite see if
this seems to work.

        Rainer


-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=7027

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