Yes,
I replicated this on an Ubuntu 11 distro with GCC 4.6.x
On Thu, Feb 23, 2012 at 5:34 PM, Iyer, Balaji V wrote:
> Hello J. K.,
> Have you tried with a newer version of GCC? GCC 4.1 is pretty old
>
> Thanks,
>
> Balaji V. Iyer.
>
> -Original Message-
> From: J K [mailto:jkwi...@gmail.com]
> Sent: Thursday, February 23, 2012 10:31 AM
> To: gcc@gcc.gnu.org
> Subject: Differences in GCC and ICC compiled objects, GCC relocations broken?
>
> Posted in the Intel forums but this may be more of a GCC issue.
> Please advise if I should post elsewhere.
>
> Compiling a C module in with a large app (>2GB data) and getting relocatable
> errors with GCC and not ICC.
>
> ./classification_dpr_BB.o: In function `BB_detection_dpr':
> /homedata/johnk/dpr/src_
> 20120126/DD2_V2.20120126/src/./
> classification_dpr_BB.c:118: relocation truncated to fit:
> R_X86_64_PC32 against `.bss'
>
> Can anyone familiar with the output of readelf see why the GCC
> object is not relocatable and the ICC one is? Would another tool
> be more suitable?
>
> icc -I../include -g -v -sox -fPIC -mcmodel=medium -DDEBUG -c
> ./classification_dpr_BB.c cc -I../include -g -v -fPIC -mcmodel=medium -DDEBUG
> -c ./classification_dpr_BB.c
>
> This module does not use more than 2GB data itself, I just need it to be
> linked with
> code that does, so -fPIC. I left off the medium memory model switch on
> both with no impact.
> Everything is static except for the -shared-intel -mcmodel=medium on the
> main link (ifort is used).
>
> Could it have something to do with the relocation types? Are there switches
> to GCC to force relocations
> like ICC?
>
> GCC
> Relocation section '.rela.text' at offset 0xd040 contains 449 entries:
> Offset Info Type Sym. Value Sym.
> Name + Addend
> 004e 00170002 R_X86_64_PC32 .rodata
> + fffc
> 008e 00040002 R_X86_64_PC32 .bss + 1e5c
> 00bc 00040002 R_X86_64_PC32 .bss + 105c
>
>
> ICC
> Relocation section '.rela.text' at offset 0xf222 contains 732 entries:
> Offset Info Type Sym. Value Sym.
> Name + Addend
> 0030 0078001a R_X86_64_GOTPC32
> _GLOBAL_OFFSET_TABLE_ + fffc
> 0036 00060019 R_X86_64_GOTOFF64
> _2il0floatpacket.15 + 0
> 0057 00070019 R_X86_64_GOTOFF64 0008
> _2il0floatpacket.16 + 0
> 009f 0078001a R_X86_64_GOTPC32
> _GLOBAL_OFFSET_TABLE_ + fffc
>
> gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-51) icc (ICC) 11.1 20100806
>
> The full output of readelf -all are at these links.
>
> ICC
> http://www.box.com/s/2iqnqydmi0mdz52xs9ac
>
> GCC
> http://www.box.com/s/jjcgq1x2s5ybpg7s9b6g
>
> Thanks for any help.
