[Bug ld/16910] New: Failed to relocate attributes of debug information when the sym is wrapped

[qiyao at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16910

            Bug ID: 16910
           Summary: Failed to relocate attributes of debug information
                    when the sym is wrapped
           Product: binutils
           Version: 2.25 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: qiyao at gcc dot gnu.org

We find this bug when we run gdb test gdb.dwarf2/dwz.exp.  Here are the steps
to reproduce this bug:

1. Compile and link
$ gcc 1.c -c -o 1.o
$ gcc 2.c -c -o 2.o
$ gcc dwz.S -c -o dwz.o
$ build-x86/ld/ld-new 1.o dwz.o 2.o --wrap main -o 1.exe

2. Examine the address of main and __wrap_main
$ readelf -s 1.exe | grep main
    10: 08048088    18 FUNC    GLOBAL DEFAULT    1 __wrap_main
    12: 08048074    20 FUNC    GLOBAL DEFAULT    1 main

3. Examine the DW_AT_low_pc attribute for main,
$ readelf -wi ./1.exe
Contents of the .debug_info section:                                            

  Compilation Unit @ offset 0x0:
   Length:        0x17 (32-bit)
   Version:       4
   Abbrev Offset: 0x0
   Pointer Size:  4
 <0><b>: Abbrev Number: 2 (DW_TAG_partial_unit)
 <1><c>: Abbrev Number: 3 (DW_TAG_subprogram)
    <d>   DW_AT_name        : main
    <12>   DW_AT_low_pc      : 0x8048088  <------- [1]
    <16>   DW_AT_high_pc     : 0x8048092

As we can see, DW_AT_low_pc should be the address of main instead of
__wrap_main, otherwise, GDB will be confused.  We find this problem on both x86
and arm targets.

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