Unix Make ar and ld

Posted on 2003-12-11
Last Modified: 2013-12-26
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.

Question by:supavan

Accepted Solution

HamdyHassan earned 25 total points
ID: 9923940

do the following
$ man ar
$ man ld

check "Creating Unix Libraries" at

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

LVL 51

Assisted Solution

ahoffmann earned 25 total points
ID: 9930977
.. 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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