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Re: Error Linking LTO programs using GCC6.4




Okay, so I managed to extract more details using binutils-debuginfo
package , but still has no clue how to solve this.  OTOH, binutils
2.25 seems to be doing better

Starting program: /usr/x86_64-pc-cygwin/bin/ld -plugin
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/cyglto_plugin.dll
-plugin-opt=/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/lto-wrapper.exe
-plugin-opt=-fresolution=/tmp/ccNFf1JQ.res
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc
-plugin-opt=-pass-through=-lcygwin
-plugin-opt=-pass-through=-ladvapi32
-plugin-opt=-pass-through=-lshell32 -plugin-opt=-pass-through=-luser32
-plugin-opt=-pass-through=-lkernel32 -plugin-opt=-pass-through=-lgcc_s
-plugin-opt=-pass-through=-lgcc --build-id -m i386pep --wrap _Znwm
--wrap _Znam --wrap _ZdlPv --wrap _ZdaPv --wrap _ZnwmRKSt9nothrow_t
--wrap _ZnamRKSt9nothrow_t --wrap _ZdlPvRKSt9nothrow_t --wrap
_ZdaPvRKSt9nothrow_t -Bdynamic --dll-search-prefix=cyg --tsaware -o
driver.exe -L/usr/lib/w32api
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/../../../../lib/crt0.o
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/crtbegin.o -L/usr/lib
-L/usr/lib/gcc/x86_64-pc-cygwin/6.4.0
-L/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/../../../../x86_64-pc-cygwin/lib/../lib
-L/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/../../../../lib -L/lib/../lib
-L/usr/lib/../lib
-L/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/../../../../x86_64-pc-cygwin/lib
-L/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/../../.. -v main.o libdriver.a
-lpcre -lz -lcrypt -lpcre -levent -lstdc++ -lgcc_s -lgcc -lcygwin
-ladvapi32 -lshell32 -luser32 -lkernel32 -lgcc_s -lgcc
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/../../../../lib/default-manifest.o
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/crtend.o
[New Thread 6752.0x2d9c]
[New Thread 6752.0x206c]
[New Thread 6752.0x284c]
[New Thread 6752.0x2278]
[New Thread 6752.0x1154]
GNU ld (GNU Binutils) 2.29.51.20170708
/usr/x86_64-pc-cygwin/bin/ld: libdriver.a(regexp.o) (15065208):
Section flag STYP_COPY (0x10) ignored

Program received signal SIGSEGV, Segmentation fault.
_bfd_coff_get_external_symbols (abfd=abfd@entry=0x6005374e0) at
/usr/src/debug/binutils-2.28-3/bfd/coffgen.c:1635
1635      if (obj_coff_external_syms (abfd) != NULL)
(gdb) bt
#0  _bfd_coff_get_external_symbols (abfd=abfd@entry=0x6005374e0) at
/usr/src/debug/binutils-2.28-3/bfd/coffgen.c:1635
#1  0x000000010045382e in coff_link_add_object_symbols
(abfd=0x6005374e0, info=0x100571c00 <link_info>) at
/usr/src/debug/binutils-2.28-3/bfd/cofflink.c:183
#2  0x000000010045433e in coff_link_check_archive_element
(abfd=0x6005374e0, info=0x100571c00 <link_info>, h=<optimized out>,
name=<optimized out>, pneeded=0xffffc11c) at
/usr/src/debug/binutils-2.28-3/bfd/cofflink.c:220
#3  0x000000010043c095 in _bfd_generic_link_add_archive_symbols
(abfd=0x6000ba0e0, info=0x100571c00 <link_info>, checkfn=0x1004542e0
<coff_link_check_archive_element>) at
/usr/src/debug/binutils-2.28-3/bfd/linker.c:977
#4  0x000000010040edb8 in load_symbols (entry=0x60003a200,
place=<optimized out>) at
/usr/src/debug/binutils-2.28-3/ld/ldlang.c:2863
#5  0x000000010040f8d0 in open_input_bfds (s=0x60003a200,
mode=mode@entry=OPEN_BFD_NORMAL) at
/usr/src/debug/binutils-2.28-3/ld/ldlang.c:3312
#6  0x0000000100411976 in lang_process () at
/usr/src/debug/binutils-2.28-3/ld/ldlang.c:7010
#7  0x00000001004e8c7a in main (argc=69, argv=0xffffc450) at
/usr/src/debug/binutils-2.28-3/ld/ldmain.c:437
(gdb) print *abfd
$1 = {filename = 0x600537640 "regexp.o (symbol from plugin)", xvec =
0x10053f140 <x86_64_pei_vec>, iostream = 0x600537670, iovec =
0x100523360 <_bfd_memory_iovec>, lru_prev = 0x0, lru_next = 0x0, where
= 9, mtime = 0, id = 4294967261, format = bfd_unknown,
  direction = read_direction, flags = 71680, cacheable = 0,
target_defaulted = 1, opened_once = 0, mtime_set = 0, no_export = 0,
output_has_begun = 0, has_armap = 0, is_thin_archive = 0,
selective_search = 0, is_linker_output = 0, is_linker_input = 0,
  plugin_format = bfd_plugin_unknown, lto_output = 0, plugin_dummy_bfd
= 0x0, origin = 0, proxy_origin = 0, section_htab = {table =
0x6005381d0, newfunc = 0x100441630 <bfd_section_hash_newfunc>, memory
= 0x600537620, size = 13, count = 0, entsize = 304,
    frozen = 0}, sections = 0x0, section_last = 0x0, section_count =
0, archive_pass = 0, start_address = 0, outsymbols = 0x0, symcount =
0, dynsymcount = 0, arch_info = 0x100522c00 <bfd_default_arch_struct>,
arelt_data = 0x0, my_archive = 0x0,
  archive_next = 0x0, archive_head = 0x0, nested_archives = 0x0, link
= {next = 0x0, hash = 0x0}, tdata = {aout_data = 0x0, aout_ar_data =
0x0, oasys_obj_data = 0x0, oasys_ar_data = 0x0, coff_obj_data = 0x0,
pe_obj_data = 0x0, xcoff_obj_data = 0x0,
    ecoff_obj_data = 0x0, ieee_data = 0x0, ieee_ar_data = 0x0,
srec_data = 0x0, verilog_data = 0x0, ihex_data = 0x0, tekhex_data =
0x0, elf_obj_data = 0x0, nlm_obj_data = 0x0, bout_data = 0x0, mmo_data
= 0x0, sun_core_data = 0x0, sco5_core_data = 0x0,
    trad_core_data = 0x0, som_data = 0x0, hpux_core_data = 0x0,
hppabsd_core_data = 0x0, sgi_core_data = 0x0, lynx_core_data = 0x0,
osf_core_data = 0x0, cisco_core_data = 0x0, versados_data = 0x0,
netbsd_core_data = 0x0, mach_o_data = 0x0,
    mach_o_fat_data = 0x0, plugin_data = 0x0, pef_data = 0x0,
pef_xlib_data = 0x0, sym_data = 0x0, any = 0x0}, usrdata =
0x60053c710, memory = 0x600537600, build_id = 0x0}

On Wed, Sep 27, 2017 at 6:51 AM, 叶雨飞 <sunyucong@xxxxxxxxx> wrote:
> The same program was linking fine using previous gcc 5.X , please
> advise how to debug further.
>
> [Linking driver.exe]
> collect2: fatal error: ld terminated with signal 11 [Segmentation
> fault], core dumped
> compilation terminated.
> /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/../../../../x86_64-pc-cygwin/bin/ld:
> libdriver.a(regexp.o) (15065197): Section flag STYP_GROUP (0x4)
> ignored
> /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/../../../../x86_64-pc-cygwin/bin/ld:
> libdriver.a(regexp.o) (15065197): Section flag STYP_COPY (0x10)
> ignored
> make: *** [Makefile:194: driver.exe] Error 1
>
> aunyx@DESKTOP-R60LL3E ~/fluffos/src
> $ cat ld.exe.stackdump
> Exception: STATUS_ACCESS_VIOLATION at rip=0010045A417
> rax=0000000000000000 rbx=0000000600525E40 rcx=0000000600525E40
> rdx=0000000100571C00 rsi=0000000000000001 rdi=00000006002E2420
> r8 =0000000600528C70 r9 =0000000000000058 r10=0000000100000000
> r11=0000000000000000 r12=00000000000003EE r13=0000000100571C00
> r14=00000006000D5B50 r15=00000006000CDC00
> rbp=00000006000D9A30 rsp=00000000FFFFC4D0
> program=D:\cygwin\usr\x86_64-pc-cygwin\bin\ld.exe, pid 8564, thread main
> cs=0033 ds=002B es=002B fs=0053 gs=002B ss=002B
> Stack trace:
> Frame        Function    Args
> 006000D9A30  0010045A417 (00100571C00, 006000E3374, 000FFFFC6A0, 00100571C00)
> 006000D9A30  0010045382E (006002E2420, 006000D9A30, 000000003EE, 00100571C00)
> 006000D9A30  0010045433E (001004EAE20, 00000000000, 0010042843B, 000FFFFC70C)
> 006000D9A30  0010043C095 (00100571C00, 001004542E0, 001800BAE1C, 00000000000)
> 00000000000  0010040EDB8 (00600075530, 00600076970, 0010050295C, 00000000000)
> 00000000000  0010040F8D0 (001802FDC50, 00600068A50, 001800BB092, 00600069690)
> 000FFFFCA40  00100411976 (003FED791C0, 006000003F0, 001800BB092, 00000390038)
> 000FFFFCA40  001004E8C7A (000FFFFCA40, 000FFFFCAF0, 00000000000, 001801C31A0)
> 000FFFFCCB0  00180047BC2 (00000000000, 00000000000, 00000000000, 00000000000)
> 00000000000  00180045863 (00000000000, 00000000000, 00000000000, 00000000000)
> 000FFFFFFF0  00180045914 (00000000000, 00000000000, 00000000000, 00000000000)
> End of stack trace

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