<html lang="en"> <head> <title>ESA/390 Notes - Using as</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="Using as"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="ESA_002f390_002dDependent.html#ESA_002f390_002dDependent" title="ESA/390-Dependent"> <link rel="next" href="ESA_002f390-Options.html#ESA_002f390-Options" title="ESA/390 Options"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <!-- This file documents the GNU Assembler "as". Copyright (C) 1991-2015 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled ``GNU Free Documentation License''. --> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="ESA%2f390-Notes"></a> <a name="ESA_002f390-Notes"></a> <p> Next: <a rel="next" accesskey="n" href="ESA_002f390-Options.html#ESA_002f390-Options">ESA/390 Options</a>, Up: <a rel="up" accesskey="u" href="ESA_002f390_002dDependent.html#ESA_002f390_002dDependent">ESA/390-Dependent</a> <hr> </div> <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 <span class="sc">gnu</span> <span class="sc">cc</span> 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>When used with the <span class="sc">gnu</span> <span class="sc">cc</span> 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. </body></html>