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Full Discussion: overhead in the archive
Top Forums UNIX for Advanced & Expert Users overhead in the archive Post 302216277 by jasoncrab on Friday 18th of July 2008 01:01:14 PM
Old 07-18-2008
overhead in the archive

Hi everyone,

I am currently trying to work out the size overhead in the library archive.
The total size of all my objects file is about 100KB. However, when I package them into the archive (libXX.a), the size gets boosted up to 200KB. I want to know what exact is that 100KB overhead. I tried with the "objdump". The only thing extra I can find is the comment field under each object file. They are only about 7KB in total. Is there a way to browse the full content of the library? or if anyone knows what exact this overhead is?


Cheers
CrabJ
 

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SIZE(1) 						       GNU Development Tools							   SIZE(1)

NAME
size - list section sizes and total size. SYNOPSIS
size [-A|-B|--format=compatibility] [--help] [-d|-o|-x|--radix=number] [-t|--totals] [--target=bfdname] [-V|--version] [objfile...] DESCRIPTION
The GNU size utility lists the section sizes---and the total size---for each of the object or archive files objfile in its argument list. By default, one line of output is generated for each object file or each module in an archive. objfile... are the object files to be examined. If none are specified, the file "a.out" will be used. OPTIONS
The command line options have the following meanings: -A -B --format=compatibility Using one of these options, you can choose whether the output from GNU size resembles output from System V size (using -A, or --for- mat=sysv), or Berkeley size (using -B, or --format=berkeley). The default is the one-line format similar to Berkeley's. Here is an example of the Berkeley (default) format of output from size: $ size --format=Berkeley ranlib size text data bss dec hex filename 294880 81920 11592 388392 5ed28 ranlib 294880 81920 11888 388688 5ee50 size This is the same data, but displayed closer to System V conventions: $ size --format=SysV ranlib size ranlib : section size addr .text 294880 8192 .data 81920 303104 .bss 11592 385024 Total 388392 size : section size addr .text 294880 8192 .data 81920 303104 .bss 11888 385024 Total 388688 --help Show a summary of acceptable arguments and options. -d -o -x --radix=number Using one of these options, you can control whether the size of each section is given in decimal (-d, or --radix=10); octal (-o, or --radix=8); or hexadecimal (-x, or --radix=16). In --radix=number, only the three values (8, 10, 16) are supported. The total size is always given in two radices; decimal and hexadecimal for -d or -x output, or octal and hexadecimal if you're using -o. -t --totals Show totals of all objects listed (Berkeley format listing mode only). --target=bfdname Specify that the object-code format for objfile is bfdname. This option may not be necessary; size can automatically recognize many formats. -V --version Display the version number of size. SEE ALSO
ar(1), objdump(1), readelf(1), and the Info entries for binutils. COPYRIGHT
Copyright (c) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License". binutils-2.13.90.0.18 2003-02-24 SIZE(1)
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