[Nasm-bugs] [Bug 3392469] mach-o executables crash with dead striping due to missing object relocations.

[noreply-nasm at gorcunov.org]

https://bugzilla.nasm.us/show_bug.cgi?id=3392469

zenith432 at users.sourceforge.net changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |OPEN
                 CC|                            |zenith432 at users.sourceforge
                   |                            |.net
         Resolution|FIXED                       |---

--- Comment #12 from zenith432 at users.sourceforge.net ---
I tested with
NASM version 2.14rc11 compiled on Jun 25 2018
(downloaded from site)

It is getting closer, but still not right.  Symbols are wrong.

nasm -f macho32 IoFifoSev.nasm
objdump -d -r -t IoFifoSev.o
==========
IoFifoSev.o:    file format Mach-O 32-bit i386

Disassembly of section __TEXT,__text:
_SevNoRepIo:
       0:       53      pushl   %ebx
       1:       51      pushl   %ecx
       2:       52      pushl   %edx
       3:       31 c0   xorl    %eax, %eax
       5:       5a      popl    %edx
       6:       59      popl    %ecx
       7:       5b      popl    %ebx
       8:       c3      retl
       9:       57      pushl   %edi
       a:       e8 f1 ff ff ff  calll   -15 <_SevNoRepIo>
                        0000000b:  GENERIC_RELOC_VANILLA        __text
       f:       85 c0   testl   %eax, %eax
      11:       5f      popl    %edi
      12:       57      pushl   %edi
      13:       e9 e8 ff ff ff  jmp     -24 <_SevNoRepIo>
                        00000014:  GENERIC_RELOC_VANILLA        __text
      18:       85 c0   testl   %eax, %eax
      1a:       5f      popl    %edi
      1b:       c3      retl
SYMBOL TABLE:
00000000 g     F __TEXT,__text  _IoReadFifo16
00000000 g     F __TEXT,__text  _IoReadFifo16
00000000 g     F __TEXT,__text  _IoReadFifo8
00000000 g     F __TEXT,__text  _IoReadFifo8
00000000 g     F __TEXT,__text  _SevNoRepIo
00000000 g     F __TEXT,__text  _SevNoRepIo
==========

This is what it should look like from clang
clang -arch i386 -c IoFifoSevS.S
objdump -d -r -t IoFifoSevS.o
==========
IoFifoSevS.o:   file format Mach-O 32-bit i386

Disassembly of section __TEXT,__text:
_SevNoRepIo:
       0:       53      pushl   %ebx
       1:       51      pushl   %ecx
       2:       52      pushl   %edx
       3:       31 c0   xorl    %eax, %eax
       5:       5a      popl    %edx
       6:       59      popl    %ecx
       7:       5b      popl    %ebx
       8:       c3      retl

_IoReadFifo16:
       9:       57      pushl   %edi
       a:       e8 f1 ff ff ff  calll   -15 <_SevNoRepIo>
                        0000000b:  GENERIC_RELOC_VANILLA        __text
       f:       85 c0   testl   %eax, %eax
      11:       5f      popl    %edi

_IoReadFifo8:
      12:       57      pushl   %edi
      13:       e8 e8 ff ff ff  calll   -24 <_SevNoRepIo>
                        00000014:  GENERIC_RELOC_VANILLA        __text
      18:       85 c0   testl   %eax, %eax
      1a:       5f      popl    %edi
      1b:       c3      retl
SYMBOL TABLE:
00000009 g     F __TEXT,__text  _IoReadFifo16
00000012 g     F __TEXT,__text  _IoReadFifo8
00000000 g     F __TEXT,__text  _SevNoRepIo
==========

Because of symbols wrong, nasm output doesn't link.
clang -arch i386 main.c IoFifoSev.o -dead_strip
duplicate symbol _IoReadFifo16 in:
    IoFifoSev.o
duplicate symbol _IoReadFifo8 in:
    IoFifoSev.o
ld: 3 duplicate symbols for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

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