| <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>3.12. Object File Portability</title><link rel="stylesheet" href="cs.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.74.0"><link rel="home" href="index.html" title="Sourcery G++ Lite"><link rel="up" href="chap-target.html" title="Chapter 3. Sourcery G++ Lite for ARM GNU/Linux"><link rel="prev" href="ch03s11.html" title="3.11. ABI Compatibility"><link rel="next" href="chap-building.html" title="Chapter 4. Using Sourcery G++ from the Command Line"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">3.12. Object File Portability</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch03s11.html">Prev</a> </td><th width="60%" align="center">Chapter 3. Sourcery G++ Lite for ARM GNU/Linux</th><td width="20%" align="right"> <a accesskey="n" href="chap-building.html">Next</a></td></tr></table><hr></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="portable-objects"></a>3.12. Object File Portability</h2></div></div></div><p> | |
| It is possible to create object files using Sourcery G++ for | |
| ARM | |
| EABI | |
| that are link-compatible with the | |
| GNU C library provided with Sourcery G++ for ARM | |
| GNU/Linux as well as with the CodeSourcery C Library or | |
| Newlib C Library provided with | |
| ARM bare-metal toolchains. | |
| <span> | |
| These object files are additionally link-compatible with | |
| other ARM C Library ABI-compliant static linking environments | |
| and toolchains. | |
| </span> | |
| </p><p> | |
| To use this feature, when compiling your files with the bare-metal | |
| ARM | |
| EABI | |
| toolchain define the preprocessor constant | |
| <code class="constant">_AEABI_PORTABILITY_LEVEL</code> to 1 | |
| before including any system header files. | |
| For example, pass the option <code class="option">-D_AEABI_PORTABILITY_LEVEL=1</code> | |
| on your compilation command line. | |
| No special options are required when linking the resulting object files. | |
| When building applications for ARM | |
| EABI, | |
| files compiled with this definition may be linked freely with those | |
| compiled without it. | |
| </p><p> | |
| Files compiled in this manner may not use the | |
| functions <code class="function">fgetpos</code> | |
| or <code class="function">fsetpos</code>, or reference the | |
| type <code class="type">fpos_t</code>. This is because Newlib assumes a | |
| representation for <code class="type">fpos_t</code> that is not AEABI-compliant. | |
| </p><p> | |
| Note that object files are only portable from bare-metal toolchains | |
| to GNU/Linux, and | |
| not vice versa; object files compiled for ARM | |
| GNU/Linux targets cannot be linked into ARM | |
| EABI | |
| executables. | |
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