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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AR(1) General Commands Manual AR(1)
NAME
ar - archive and library maintainer
SYNOPSIS
ar key [ posname ] afile name ...
DESCRIPTION
Ar maintains groups of files combined into a single archive file. Its main use is to create and update library files as used by the
loader. It can be used, though, for any similar purpose.
Key is one character from the set drqtpmx, optionally concatenated with one or more of vuaibcl. Afile is the archive file. The names are
constituent files in the archive file. The meanings of the key characters are:
d Delete the named files from the archive file.
r Replace the named files in the archive file. If the optional character u is used with r, then only those files with modified dates
later than the archive files are replaced. If an optional positioning character from the set abi is used, then the posname argument
must be present and specifies that new files are to be placed after (a) or before (b or i) posname. Otherwise new files are placed
at the end.
q Quickly append the named files to the end of the archive file. Optional positioning characters are invalid. The command does not
check whether the added members are already in the archive. Useful only to avoid quadratic behavior when creating a large archive
piece-by-piece.
t Print a table of contents of the archive file. If no names are given, all files in the archive are tabled. If names are given,
only those files are tabled.
p Print the named files in the archive.
m Move the named files to the end of the archive. If a positioning character is present, then the posname argument must be present
and, as in r, specifies where the files are to be moved.
x Extract the named files. If no names are given, all files in the archive are extracted. In neither case does x alter the archive
file.
v Verbose. Under the verbose option, ar gives a file-by-file description of the making of a new archive file from the old archive and
the constituent files. When used with t, it gives a long listing of all information about the files. When used with p, it precedes
each file with a name.
c Create. Normally ar will create afile when it needs to. The create option suppresses the normal message that is produced when
afile is created.
l Local. Normally ar places its temporary files in the directory /tmp. This option causes them to be placed in the local directory.
FILES
/tmp/v* temporaries
SEE ALSO
ld(1), ar(5), lorder(1)
BUGS
If the same file is mentioned twice in an argument list, it may be put in the archive twice.
AR(1)