Hi,
I'm see a segfault when building the attached two object files into a shared
object. It has something to do with the unwind section and section ordering,
though the details have escaped me.
A debugging session is illustrated below. This is from CVS just a few moments
ago.
Thanks!
-i
(gdb) r -shared -o test.so mainwindow.o moc_qassistantclient.o
Starting program: /usr/local/bin/ld-cvs -shared -o test.so mainwindow.o
moc_qassistantclient.o
Program received signal SIGSEGV, Segmentation fault.
0x400ceee0 in elf_get_linked_section_vma (p=Variable "p" is not
available.
) at ../../binutils-cvs/bfd/elflink.c:7604
7604 return s->output_section->vma + s->output_offset;
(gdb) back
#0 0x400ceee0 in elf_get_linked_section_vma (p=Variable "p" is not
available.
) at ../../binutils-cvs/bfd/elflink.c:7604
#1 0x400cef60 in compare_link_order (a=0x601e5af8,
b=0x601e5b00) at ../../binutils-cvs/bfd/elflink.c:7619
#2 0x200bd1e0 in msort_with_tmp () from /lib/tls/libc.so.6.1
#3 0x200bcf00 in msort_with_tmp () from /lib/tls/libc.so.6.1
#4 0x200bced0 in msort_with_tmp () from /lib/tls/libc.so.6.1
#5 0x200bced0 in msort_with_tmp () from /lib/tls/libc.so.6.1
#6 0x200bcf00 in msort_with_tmp () from /lib/tls/libc.so.6.1
#7 0x200bcf00 in msort_with_tmp () from /lib/tls/libc.so.6.1
#8 0x200bcf00 in msort_with_tmp () from /lib/tls/libc.so.6.1
#9 0x200bcf00 in msort_with_tmp () from /lib/tls/libc.so.6.1
#10 0x200bd380 in qsort () from /lib/tls/libc.so.6.1
#11 0x400cfb60 in bfd_elf_final_link (abfd=0x6002a7d0,
info=0x60017518) at ../../binutils-cvs/bfd/elflink.c:7699
#12 0x40091490 in elf64_ia64_final_link (abfd=0x6002a7d0,
info=0x60017518) at elf64-ia64.c:4028
#13 0x40039a40 in ldwrite () at ../../binutils-cvs/ld/ldwrite.c:557
#14 0x40033c70 in main (argc=6, argv=0x6fe73478) at
../../binutils-cvs/ld/ldmain.c:468
(gdb) up
#1 0x400cef60 in compare_link_order (a=0x601e5af8,
b=0x601e5b00) at ../../binutils-cvs/bfd/elflink.c:7619
7619 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
(gdb) print *(*(struct bfd_link_order **)a).u.indirect.section
$1 = {name = 0x6006b12b
".gnu.linkonce.ia64unw._ZThn80_N10MainWindowD0Ev", id = 822, index = 806, next =
0x600f8400,
prev = 0x600f81d0, flags = 131371, user_set_vma = 1, linker_mark = 1,
linker_has_input = 0, gc_mark = 0, gc_mark_from_eh = 0, segment_mark = 0,
sec_info_type = 0, use_rela_p = 1, has_tls_reloc = 0, has_gp_reloc = 0,
need_finalize_relax = 0, reloc_done = 0, vma = 0, lma = 0, size = 0, rawsize =
0,
output_offset = 6816, output_section = 0x6003d5d0, alignment_power =
0, relocation = 0x0, orelocation = 0x0, reloc_count = 0, filepos = 344288,
rel_filepos = 0, line_filepos = 0, userdata = 0x0, contents = 0x0, lineno =
0x0, lineno_count = 0, entsize = 0, kept_section = 0x0,
moving_line_filepos = 0, target_index = 0, used_by_bfd = 0x600f78d0,
constructor_chain = 0x0, owner = 0x6003bcb0,
symbol = 0x600f7870, symbol_ptr_ptr = 0x600f83c8, map_head =
{link_order = 0x6016ecf0, s = 0x6016ecf0}, map_tail = {
link_order = 0x600f7fa0, s = 0x600f7fa0}}
(gdb) print *(*(struct bfd_link_order **)a).u.indirect.section->owner
$2 = {id = 1, filename = 0x6fe73759 "mainwindow.o", xvec =
0x4015e810, iostream = 0x6003de10, iovec = 0x40151558,
cacheable = 1, target_defaulted = 0, lru_prev = 0x60105850, lru_next =
0x6002a7d0, where = 283872, opened_once = 1, mtime_set = 0,
mtime = 0, ifd = 0, format = bfd_object, direction = read_direction, flags =
17, origin = 0, output_has_begun = 0, section_htab = {
table = 0x6003f150, size = 4051, newfunc = @0x4016efc0:
0x40067ba0 , memory = 0x6003e130},
sections = 0x6003e178, section_last = 0x6017cd70,
section_count = 858, start_address = 0, symcount = 0, outsymbols = 0x0,
dynsymcount = 0,
arch_info = 0x4016ad00, no_export = 0, arelt_data = 0x0, my_archive =
0x0, next = 0x0, archive_head = 0x0, has_armap = 0,
link_next = 0x60105850, archive_pass = 0, tdata = {aout_data =
0x6003be20, aout_ar_data = 0x6003be20,
oasys_obj_data = 0x6003be20, oasys_ar_data = 0x6003be20,
coff_obj_data = 0x6003be20, pe_obj_data = 0x6003be20,
xcoff_obj_data = 0x6003be20, ecoff_obj_data = 0x6003be20,
ieee_data = 0x6003be20, ieee_ar_data = 0x6003be20,
srec_data = 0x6003be20, ihex_data = 0x6003be20, tekhex_data
= 0x6003be20, elf_obj_data = 0x6003be20,
nlm_obj_data = 0x6003be20, bout_data = 0x6003be20, mmo_data
= 0x6003be20, sun_core_data = 0x6003be20,
