[LLVMbugs] [Bug 3852] New: symbol relocation; llvm-gcc V. gcc

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3852

           Summary: symbol relocation; llvm-gcc V. gcc
           Product: tools
           Version: 2.5
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: llvm-gcc
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: omineo at gmail.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=2745)
 --> (http://llvm.org/bugs/attachment.cgi?id=2745)
tarball with driver source/asm/llvm bc/binary for the file with the "bad"
symbols

I've compiled a module using llvm-gcc-4.2/llvm-2.5 and I've noticed that there
are few symbols that are marked R_X86_64_PLT32 instead of R_X86_64_PC32.

However, the same sources when compiled with gcc-4.1.2-8 do not have any
R_X86_64_PLT32 typed symbols at all. 

The same set of flags are being used in both the cases, so I'm not sure why
some symbols are getting tagged with R_X86_64_PLT32.

More information:

- All the files in the module include the following pragma:

#pragma GCC visibility push(hidden)

- the flags used for compilation (gcc-specific)

<compiler> -fno-strict-aliasing -fno-working-directory -gdwarf-2 -g3 -O2 -Wall
-Werror -Wstrict-prototypes -fPIE -falign-functions=4 -falign-jumps=4
-falign-loops=4 -ffreestanding -fno-common -fno-omit-frame-pointer
-fno-strength-reduce -march=x86-64 -mcmodel=small -minline-all-stringops
-mno-red-zone -nostartfiles -nostdlib -Werror -Wno-unused-value
-Wno-pointer-sign -Wno-strict-prototypes <source-file>

- Platform: x86-64/Ubuntu

- Attachments:
      - tarball with driver source/asm/llvm bc for the file with the "bad"
symbols

Please let me know if you need more information. I could not really find much
information about PLT/GOT and visibility and how the symbols are affected by
them. So, I may be wrong and this might not be a bug. But, I'm just wondering
about the difference in the symbols generated by gcc and llvm-gcc.


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