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<title>Using as: ESA/390 Notes</title>

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<a name="ESA_002f390-Notes"></a>
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Next: <a href="ESA_002f390-Options.html#ESA_002f390-Options" accesskey="n" rel="next">ESA/390 Options</a>, Up: <a href="ESA_002f390_002dDependent.html#ESA_002f390_002dDependent" accesskey="u" rel="up">ESA/390-Dependent</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Notes-2"></a>
<h4 class="subsection">9.14.1 Notes</h4>
<p>The ESA/390 <code>as</code> port is currently intended to be a back-end
for the <small>GNU</small> <small>CC</small> compiler.  It is not HLASM compatible, although
it does support a subset of some of the HLASM directives.  The only
supported binary file format is ELF; none of the usual MVS/VM/OE/USS
object file formats, such as ESD or XSD, are supported.
</p>
<p>When used with the <small>GNU</small> <small>CC</small> compiler, the ESA/390 <code>as</code>
will produce correct, fully relocated, functional binaries, and has been
used to compile and execute large projects.  However, many aspects should
still be considered experimental; these include shared library support,
dynamically loadable objects, and any relocation other than the 31-bit
relocation.
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