Size of binary

[Hinko Kocevar]

Hi all,

We are using uClibc libc on our embedded target system running on Axis ETRAX LX100 CPU - cris architecture.
For quite some time Axis provides only 0.9.27 version of uClibc. Following the discussion on openwrt and uclibc buildroot mailing lists I managed to get uClibc 0.9.29 working on cris.

The problem is the of the final binary. Here are results:
hinkok at alala /work/hello $ cat hello.c 
#include <stdio.h>

int main (void)
{
	printf("FU");
	return 1;
}

0.9.27
------
$ gcc_cris -mlinux -muclibc=/fw/afc2_R1.gen/stage.uclibc hello.c -o _hello_cris_old_uclibc_dyn
$ ls -l _hello_cris_old_uclibc_dyn
-rwxr-xr-x 1 hinkok hinkok    2196 Aug 20 14:52 _hello_cris_old_uclibc_dyn

hinkok at alala /work/hello $ /usr/local/cris/bin/cris-axis-linux-gnu-readelf -l _hello_cris_old_uclibc_dyn 

Elf file type is EXEC (Executable file)
Entry point 0x80234
There are 5 program headers, starting at offset 52

Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  PHDR           0x000034 0x00080034 0x00080034 0x000a0 0x000a0 R E 0x4
  INTERP         0x0000d4 0x000800d4 0x000800d4 0x00014 0x00014 R   0x1
      [Requesting program interpreter: /lib/ld-uClibc.so.0]
  LOAD           0x000000 0x00080000 0x00080000 0x00288 0x00288 R E 0x2000
  LOAD           0x0002a0 0x000822a0 0x000822a0 0x000a4 0x000c0 RW  0x2000
  DYNAMIC        0x0002a8 0x000822a8 0x000822a8 0x00088 0x00088 RW  0x4

 Section to Segment mapping:
  Segment Sections...
   00     
   01     .interp 
   02     .interp .hash .dynsym .dynstr .rela.plt .plt .text .rodata 
   03     .data .dynamic .got .bss 
   04     .dynamic 


0.9.29
------
$ /work/stage/buildroot/build_cris/staging_dir/usr/bin/cris-linux-uclibc-gcc hello.c -o _hello_cris_new_uclibc_dyn
$ ls -l _hello_cris_new_uclibc_dyn
-rwxr-xr-x 1 hinkok hinkok    6104 Aug 20 14:52 _hello_cris_new_uclibc_dyn

hinkok at alala /work/hello $ /work/stage/buildroot/build_cris/staging_dir/usr/bin/cris-linux-uclibc-readelf -l _hello_cris_new_uclibc_dyn 

Elf file type is EXEC (Executable file)
Entry point 0x80344
There are 5 program headers, starting at offset 52

Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  PHDR           0x000034 0x00080034 0x00080034 0x000a0 0x000a0 R E 0x4
  INTERP         0x0000d4 0x000800d4 0x000800d4 0x00014 0x00014 R   0x1
      [Requesting program interpreter: /lib/ld-uClibc.so.0]
  LOAD           0x000000 0x00080000 0x00080000 0x0058c 0x0058c R E 0x2000
  LOAD           0x00058c 0x0008258c 0x0008258c 0x000f0 0x00114 RW  0x2000
  DYNAMIC        0x0005a0 0x000825a0 0x000825a0 0x000b8 0x000b8 RW  0x4

 Section to Segment mapping:
  Segment Sections...
   00     
   01     .interp 
   02     .interp .hash .dynsym .dynstr .gnu.version .gnu.version_r .rela.plt .init .plt .text .fini .rodata .eh_frame 
   03     .ctors .dtors .jcr .dynamic .got .data .bss 
   04     .dynamic 

Why is size of the binary so much bigger with 0.9.29? Almost 3 times! And it does not get better if the binary is stripped - still approximately 3 times larger binary. The only difference I can see is LOAD section that is significantly larger in newer uClibc. Does this apply to /lib/ld-uClibc.so.0?

I've appended both uClibc config files for comparison, but I think they are pretty much the same.

Thank you,
Hinko

-- 
ČETRTA POT, d.o.o., Kranj
Planina 3
4000 Kranj
Slovenia, Europe
Tel. +386 (0) 4 280 66 03
E-mail: hinko.kocevar at cetrtapot.si
Http: www.cetrtapot.si

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