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Re: crosstool bloat

From: David Karlton <dkarlton at themediamall dot com>
To: Dave Korn <dave dot korn at artimi dot com>
Cc: "'Peter Barada'" <peter at the-baradas dot com>, crossgcc at sourceware dot org
Date: Mon, 19 Sep 2005 11:01:00 -0400
Subject: Re: crosstool bloat
References: <SERRANOuwdUTaGmvSVM000000b0@SERRANO.CAM.ARTIMI.COM>

Dave Korn wrote:

----Original Message----
From: Dave Korn
Sent: 19 September 2005 15:26
----Original Message----
From: Peter Barada
Sent: 19 September 2005 15:17
That's exactly what I did, and the bloated one had an additional section:
Idx Name          Size      VMA       LMA       File off  Algn
10 .MIPS.stubs   000000a0  00400e50  00400e50  00000e50  2**2
but I don't know what this really means.
That section size is only 160 bytes in size.  What section is the
other 60k in?
Yep, post the full output from "objdump -x".
^^^^^^^^^^^^
  ... from both before and after versions of your simplest 'hello world'
testcase.  (should have been clearer about that first time round).
    cheers,
      DaveK

Sorry, here's the output as well from the older (non-bloated) version:

*******************************************************

dkarlton@fox:~/test> objdump -x hello.3.2.3

hello.3.2.3:     file format elf32-little
hello.3.2.3
architecture: UNKNOWN!, flags 0x00000112:
EXEC_P, HAS_SYMS, D_PAGED
start address 0x00400500

Program Header:
    PHDR off    0x00000034 vaddr 0x00400034 paddr 0x00400034 align 2**2
         filesz 0x000000e0 memsz 0x000000e0 flags r-x
  INTERP off    0x00000114 vaddr 0x00400114 paddr 0x00400114 align 2**0
         filesz 0x0000000d memsz 0x0000000d flags r--
0x70000000 off    0x00000150 vaddr 0x00400150 paddr 0x00400150 align 2**2
         filesz 0x00000018 memsz 0x00000018 flags r--
    LOAD off    0x00000000 vaddr 0x00400000 paddr 0x00400000 align 2**12
         filesz 0x00000950 memsz 0x00000950 flags r-x
    LOAD off    0x00001000 vaddr 0x10000000 paddr 0x10000000 align 2**12
         filesz 0x00000080 memsz 0x000000a0 flags rw-
 DYNAMIC off    0x00000168 vaddr 0x00400168 paddr 0x00400168 align 2**2
         filesz 0x000002c2 memsz 0x000002c2 flags rwx
    NOTE off    0x00000130 vaddr 0x00400130 paddr 0x00400130 align 2**4
         filesz 0x00000020 memsz 0x00000020 flags r--

Dynamic Section:
  NEEDED      libc.so.6
  INIT        0x400468
  FINI        0x4008e0
  HASH        0x400240
  STRTAB      0x40036c
  SYMTAB      0x40028c
  STRSZ       0xbe
  SYMENT      0x10
  0x70000016  0x10000020
  DEBUG       0x0
  PLTGOT      0x10000040
  0x70000001  0x1
  0x70000005  0x2
  0x70000006  0x400000
  0x7000000a  0x7
  0x70000011  0xe
  0x70000012  0x1e
  0x70000013  0x5
  VERNEED     0x400448
  VERNEEDNUM  0x1
  VERSYM      0x40042a

Version References:
  required from libc.so.6:
    0x0d696910 0x00 02 GLIBC_2.0

Sections: Idx Name Size VMA LMA File off Algn 0 .interp 0000000d 00400114 00400114 00000114 2**0 CONTENTS, ALLOC, LOAD, READONLY, DATA 1 .note.ABI-tag 00000020 00400130 00400130 00000130 2**4 CONTENTS, ALLOC, LOAD, READONLY, DATA 2 .dynamic 000000d8 00400168 00400168 00000168 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA 3 .hash 0000004c 00400240 00400240 00000240 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA 4 .dynsym 000000e0 0040028c 0040028c 0000028c 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA 5 .dynstr 000000be 0040036c 0040036c 0000036c 2**0 CONTENTS, ALLOC, LOAD, READONLY, DATA 6 .gnu.version 0000001c 0040042a 0040042a 0000042a 2**1 CONTENTS, ALLOC, LOAD, READONLY, DATA 7 .gnu.version_r 00000020 00400448 00400448 00000448 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA 8 .init 0000008c 00400468 00400468 00000468 2**2 CONTENTS, ALLOC, LOAD, READONLY, CODE 9 .text 000003e0 00400500 00400500 00000500 2**4 CONTENTS, ALLOC, LOAD, READONLY, CODE 10 .fini 0000004c 004008e0 004008e0 000008e0 2**2 CONTENTS, ALLOC, LOAD, READONLY, CODE 11 .rodata 00000020 00400930 00400930 00000930 2**4 CONTENTS, ALLOC, LOAD, READONLY, DATA 12 .data 00000020 10000000 10000000 00001000 2**4 CONTENTS, ALLOC, LOAD, DATA 13 .rld_map 00000004 10000020 10000020 00001020 2**2 CONTENTS, ALLOC, LOAD, DATA 14 .eh_frame 00000004 10000024 10000024 00001024 2**2 CONTENTS, ALLOC, LOAD, DATA 15 .ctors 00000008 10000028 10000028 00001028 2**2 CONTENTS, ALLOC, LOAD, DATA 16 .dtors 00000008 10000030 10000030 00001030 2**2 CONTENTS, ALLOC, LOAD, DATA 17 .jcr 00000004 10000038 10000038 00001038 2**2 CONTENTS, ALLOC, LOAD, DATA 18 .got 00000040 10000040 10000040 00001040 2**4 CONTENTS, ALLOC, LOAD, DATA 19 .sbss 00000000 10000080 10000080 00001080 2**0 ALLOC 20 .bss 00000020 10000080 10000080 00001080 2**4 ALLOC 21 .comment 0000006c 00000000 00000000 00001080 2**0 CONTENTS, READONLY 22 .pdr 00000020 00000000 00000000 0000143c 2**2 CONTENTS, READONLY 23 .mdebug.abi32 00000000 00000000 00000000 0000145c 2**0 CONTENTS, READONLY SYMBOL TABLE: 00400114 l d .interp 00000000 00400130 l d .note.ABI-tag 00000000 00400150 l d *ABS* 00000000 00400168 l d .dynamic 00000000 00400240 l d .hash 00000000 0040028c l d .dynsym 00000000 0040036c l d .dynstr 00000000 0040042a l d .gnu.version 00000000 00400448 l d .gnu.version_r 00000000 00400468 l d .init 00000000 00400500 l d .text 00000000 004008e0 l d .fini 00000000 00400930 l d .rodata 00000000 10000000 l d .data 00000000 10000020 l d .rld_map 00000000 10000024 l d .eh_frame 00000000 10000028 l d .ctors 00000000 10000030 l d .dtors 00000000 10000038 l d .jcr 00000000 10000040 l d .got 00000000 10000080 l d .sbss 00000000 10000080 l d .bss 00000000 00000000 l d .comment 00000000 00000000 l d *ABS* 00000000 00000000 l d *ABS* 00000000 00000000 l d *ABS* 00000000 00000000 l d *ABS* 00000000 00000000 l d .pdr 00000000 00000000 l d .mdebug.abi32 00000000 00000000 l d *ABS* 00000000 00000000 l d *ABS* 00000000 00000000 l d *ABS* 00000000 00000000 l df *ABS* 00000000 <command line> 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/build-glibc/config.h 00000000 l df *ABS* 00000000 <command line> 00000000 l df *ABS* 00000000 <built-in> 0040055c l .text 00000000 hlt 00000000 l df *ABS* 00000000 abi-note.S 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/build-glibc/csu/abi-tag.h 00000000 l df *ABS* 00000000 abi-note.S 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/build-glibc/config.h 00000000 l df *ABS* 00000000 abi-note.S 00000000 l df *ABS* 00000000 <command line> 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/build-glibc/config.h 00000000 l df *ABS* 00000000 <command line> 00000000 l df *ABS* 00000000 <built-in> 00000000 l df *ABS* 00000000 abi-note.S 00000000 l df *ABS* 00000000 init.c 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/build-glibc/csu/crti.S 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/build-glibc/csu/defs.h 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/build-glibc/csu/crti.S 00000000 l df *ABS* 00000000 <command line> 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/build-glibc/config.h 00000000 l df *ABS* 00000000 <command line> 00000000 l df *ABS* 00000000 <built-in> 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/build-glibc/csu/crti.S 00400580 l F .text 00000000 call_gmon_start 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/gcc-3.2.3/gcc/crtstuff.c 10000028 l O .ctors 00000000 __CTOR_LIST__ 10000030 l O .dtors 00000000 __DTOR_LIST__ 10000024 l O .eh_frame 00000000 __EH_FRAME_BEGIN__ 10000038 l O .jcr 00000000 __JCR_LIST__ 10000014 l O .data 00000000 p.0 10000080 l O .bss 00000001 completed.1 004005d0 l F .text 00000000 __do_global_dtors_aux 004006bc l F .text 00000000 call___do_global_dtors_aux 10000084 l O .bss 00000018 object.2 004006e8 l F .text 00000000 frame_dummy 00400788 l F .text 00000000 call_frame_dummy 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/gcc-3.2.3/gcc/crtstuff.c 1000002c l O .ctors 00000000 __CTOR_END__ 10000034 l O .dtors 00000000 __DTOR_END__ 10000024 l O .eh_frame 00000000 __FRAME_END__ 10000038 l O .jcr 00000000 __JCR_END__ 00400820 l F .text 00000000 __do_global_ctors_aux 004008ac l F .text 00000000 call___do_global_ctors_aux 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/build-glibc/csu/crtn.S 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/build-glibc/csu/defs.h 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/build-glibc/csu/crtn.S 00000000 l df *ABS* 00000000 <command line> 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/build-glibc/config.h 00000000 l df *ABS* 00000000 <command line> 00000000 l df *ABS* 00000000 <built-in> 00000000 l df *ABS* 00000000 /home/dkarlton/crosstool-0.28-rc36/build/mipsel-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.3/build-glibc/csu/crtn.S 00000000 l df *ABS* 00000000 hello.c 10000010 l O .data 00000000 .hidden __dso_handle 10000000 g .data 00000000 _fdata 10008030 g d *ABS* 00000000 _gp_disp 00000001 g d *ABS* 00000000 _DYNAMIC_LINKING 00400168 g O .dynamic 00000000 _DYNAMIC 00000000 w F *UND* 00000000 __register_frame_info@@GLIBC_2.0 10008030 g *ABS* 00000000 _gp 00400468 g F .init 00000000 _init 00000000 w F *UND* 00000000 __deregister_frame_info@@GLIBC_2.0 00400500 g O .text 00000000 __start 00400500 g .text 00000000 _ftext 10000020 g O .rld_map 00000000 __RLD_MAP 10000080 g *ABS* 00000000 __bss_start 004007c0 g F .text 00000000 main 00000000 F *UND* 00000000 __libc_start_main@@GLIBC_2.0 10000000 w O .data 00000000 data_start 00000000 F *UND* 00000000 printf@@GLIBC_2.0 004008e0 g F .fini 00000000 _fini 10000080 g *ABS* 00000000 _edata 10000040 g O .got 00000000 _GLOBAL_OFFSET_TABLE_ 100000a0 g *ABS* 00000000 _end 00400930 g O .rodata 00000004 _IO_stdin_used 10000000 g O .data 00000000 __data_start 00000000 w *UND* 00000000 _Jv_RegisterClasses 10000080 g *ABS* 00000000 _fbss 00000000 w *UND* 00000000 __gmon_start__


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References:
- RE: crosstool bloat
  - From: Dave Korn

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