| <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>3.8. GLIBC Backtrace Support</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="linux-gdbserver.html" title="3.7. Using GDB Server for Debugging"><link rel="next" href="sec-armfloat.html" title="3.9. Using VFP Floating Point"></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">3.8. GLIBC Backtrace Support</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="linux-gdbserver.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="sec-armfloat.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="sec-backtrace"></a>3.8. GLIBC Backtrace Support</h2></div></div></div><p> | |
| Sourcery G++ supports the <code class="function">backtrace</code> function | |
| from GLIBC. | |
| <span> | |
| Backtracing is supported regardless of optimization, | |
| with or without a frame pointer, and in both ARM and Thumb modes. | |
| </span> | |
| </p><p> | |
| In order to support backtracing, Sourcery G++ enables generation of | |
| unwind tables by default when compiling. | |
| These tables are used for any stack traversal, including | |
| <code class="function">backtrace</code>, C++ exception handling, and POSIX | |
| thread cancellation. Where none of these are required, you can | |
| reduce application size by compiling with | |
| <code class="option">-fno-unwind-tables</code>. | |
| </p><p> | |
| Some stand-alone programs, including bootloaders and the Linux | |
| kernel, cannot be built with unwind tables. To accommodate | |
| these programs, Sourcery G++ suppresses unwind tables | |
| for C code if the <code class="option">-ffreestanding</code> option is used. | |
| <span> | |
| Unwind tables are also suppressed if | |
| the <code class="option">-mabi</code> option is provided, as | |
| this option is not generally used in user-space programs. | |
| </span> | |
| To override this behavior, specify <code class="option">-funwind-tables</code> | |
| on the <code class="command">arm-none-linux-gnueabi-gcc</code> command line. | |
| </p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="linux-gdbserver.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="chap-target.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sec-armfloat.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">3.7. Using GDB Server for Debugging </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 3.9. Using VFP Floating Point</td></tr></table></div></body></html> |