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<H1><A NAME="SECTION04140000000000000000"></A><A NAME="s:sidl_lib"></A>
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SIDL Library Issues
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<P>
As mentioned in Section <A HREF="node100.html#s:sidl_runtime">5.5</A>, the Babel toolkit includes the
SIDL runtime library. The library provides a base interface, class,
and exception as the foundation. This is how Babel provides object-oriented
features to non-object-oriented languages. In order to support the runtime
system and build the SIDL library, it also provides DLL and Loader classes.
<P>
<A NAME="11220"></A>Babel generated code depends critically on <TT>babel_config.h</TT> to correctly
define a lot of platform specific details. One detail that changes too
frequently to encode in <TT>babel_config.h</TT> is whether or not the software
is being compiled is position independent code (PIC). This detail is commonly
added to the compilation instruction using the flags (e.g. <TT>-fPIC -DPIC</TT>
<A NAME="tex2html49"
HREF="footnode.html#foot11281"><SUP><SPAN CLASS="arabic">15</SPAN>.<SPAN CLASS="arabic">2</SPAN></SUP></A>). The first flag tells the compiler to generate position independent
code. The second defines the preprocessor macro <TT>PIC</TT>. Looking now at
<TT>babel_config.h</TT>, we see that either <TT>SIDL_DYNAMIC_LIBRARY</TT> or
<TT>SIDL_STATIC_LIBRARY</TT> are defined depending on whether or not <TT>PIC</TT>
is defined.
<P>
As described in Section <A HREF="node194.html#ss:pic">14.3.1</A>, Babel tends to focus on static libraries
and dynamic linked libraries; not worrying much about <A NAME="11231"></A>shared libraries. The
main reason is that for every last drop of performance, people would want
static libraries. To support Java and Python (and the CCA model) dynamic
loading is required. There's no real benefit to doing shared libraries that
can't be dynamically loaded, so in developing Babel, we focus on the other two
linkage situations.
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<br><br>babel-0.10.2<br>users_guide Last Modified 2005-03-23<br><br><a href="http://www.llnl.gov/CASC/components">http://www.llnl.gov/CASC/components</a><br><a href="mailto:components@llnl.gov">components@llnl.gov</a>
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