[llvm-bugs] [Bug 50010] New: llvm-objdump doesn't list symbols in ppc64 objects, but does so in ppc64le ones

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50010

            Bug ID: 50010
           Summary: llvm-objdump doesn't list symbols in ppc64 objects,
                    but does so in ppc64le ones
           Product: tools
           Version: trunk
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: llvm-objdump
          Assignee: unassignedbugs at nondot.org
          Reporter: nabijaczleweli at nabijaczleweli.xyz
                CC: llvm-bugs at lists.llvm.org

Consider the following C code:
    int symbol_a(void) {
        return 'a';
    }

    int symbol_b(void) {
        return 'b';
    }

When built for ppc64el, everything appears in order:
    $ cc -target ppc64le-unknown-linux-gnu a.c -c -oa.o
    $ llvm-objdump -d a.o

    a.o:    file format elf64-powerpcle


    Disassembly of section .text:

    0000000000000000 <symbol_a>:
           0: 61 00 60 38   li 3, 97
           4: 20 00 80 4e   blr
                    ...
          14: 00 00 00 60   nop
          18: 00 00 00 60   nop
          1c: 00 00 00 60   nop

    0000000000000020 <symbol_b>:
          20: 62 00 60 38   li 3, 98
          24: 20 00 80 4e   blr
                    ...

But when building for ppc64, the symbol listing is gone:
    $ cc -target ppc64-unknown-linux-gnu a.c -c -oa.o
    $ llvm-objdump -d a.o

    a.o:    file format elf64-powerpc


    Disassembly of section .text:

    0000000000000000 <.text>:
           0: 38 60 00 61   li 3, 97
           4: 4e 80 00 20   blr
                    ...
          14: 38 60 00 62   li 3, 98
          18: 4e 80 00 20   blr
                    ...

Both object files have a symtab:
    $ llvm-objdump -h a.o

    a.o:    file format elf64-powerpcle

    Sections:
    Idx Name            Size     VMA              Type
      0                 00000000 0000000000000000
      1 .strtab         00000063 0000000000000000
      2 .text           00000034 0000000000000000 TEXT
      3 .comment        00000056 0000000000000000
      4 .note.GNU-stack 00000000 0000000000000000
      5 .eh_frame       00000040 0000000000000000 DATA
      6 .rela.eh_frame  00000030 0000000000000000
      7 .llvm_addrsig   00000000 0000000000000000
      8 .symtab         00000078 0000000000000000

    $ llvm-objdump -h a.o

    a.o:    file format elf64-powerpc

    Sections:
    Idx Name            Size     VMA              Type
      0                 00000000 0000000000000000
      1 .strtab         00000073 0000000000000000
      2 .text           00000028 0000000000000000 TEXT
      3 .opd            00000030 0000000000000000 DATA
      4 .rela.opd       00000060 0000000000000000
      5 .comment        00000056 0000000000000000
      6 .note.GNU-stack 00000000 0000000000000000
      7 .eh_frame       00000040 0000000000000000 DATA
      8 .rela.eh_frame  00000030 0000000000000000
      9 .llvm_addrsig   00000000 0000000000000000
     10 .symtab         00000090 0000000000000000


And on rudimentary inspexion, both objects' symtabs appear to contain the
names.

My toolchain is as follows
    Debian clang version
13.0.0-++20210415102640+07edd7899392-1~exp1~20210415203405.1444
    Target: x86_64-pc-linux-gnu
    Thread model: posix
    InstalledDir: /bin
obtained from the current buster nightly packages.

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