Unix Make ar and ld

What do ar and ld exactly do in making a library? Are these diiferent programs for the same purpose or are they used in tandem for file archiving. Can anybody point me to some links. I heard that the order of the libraries matters in ar and does not in ld. can somebody elaborate.

Thanks,
--P
supavanAsked:
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HamdyHassanCommented:

do the following
$ man ar
$ man ld

check "Creating Unix Libraries" at
http://www.cs.duke.edu/~ola/courses/programming/libraries.html

From this article, you could see "ar" is used for "Static Libraries" and "ld" is used for "Dynamic libraries"


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ahoffmannCommented:
.. completing HamdyHassan comment:
ar - maintain portable archive or library
simply maintains a group of (.o) files in an archive.
When building executable from object files or archives, the order is important.

ld - link-editor for object files
is either used to build (dynamic) hared objects, which either is a (dynamic) shared library, or an executable.
For these objects the oder is not important as long as there are no cyclic references and no other static objects.
For details see corresponding man pages
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