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| <div class="section" id="baselibc"> |
| <h1>Baselibc<a class="headerlink" href="#baselibc" title="Permalink to this headline">¶</a></h1> |
| <p>Baselibc is a very simple libc for embedded systems geared primarily for |
| 32-bit microcontrollers in the 10-100kB memory range. The library of |
| basic system calls and facilities compiles to less than 5kB total on |
| Cortex-M3, and much less if some functions aren’t used.</p> |
| <p>The code is based on klibc and tinyprintf modules, and licensed under |
| the BSD license.</p> |
| <p>Baselibc comes from <a class="reference external" href="https://github.com/PetteriAimonen/Baselibc.git">https://github.com/PetteriAimonen/Baselibc.git</a></p> |
| <div class="section" id="description"> |
| <h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2> |
| <p>Mynewt OS can utilize libc which comes with compiler (e.g. newlib |
| bundled with some binary distributions of arm-none-eabi-gcc). However, |
| you may choose to replace the libc with baselibc for a reduced image |
| size. Baselibc optimizes for size rather than performance, which is |
| usually a more important goal in embedded environments.</p> |
| </div> |
| <div class="section" id="how-to-switch-to-baselibc"> |
| <h2>How to switch to baselibc<a class="headerlink" href="#how-to-switch-to-baselibc" title="Permalink to this headline">¶</a></h2> |
| <p>In order to switch from using libc to using baselibc you have to add the |
| baselibc pkg as a dependency in the project pkg. Specifying this |
| dependency ensures that the linker first looks for the functions in |
| baselibc before falling back to libc while creating the executable. For |
| example, project <code class="docutils literal notranslate"><span class="pre">boot</span></code> uses baselibc. Its project description file |
| <code class="docutils literal notranslate"><span class="pre">boot.yml</span></code> looks like the following:</p> |
| <p><code class="docutils literal notranslate"><span class="pre">no-highlight</span>    <span class="pre">project.name:</span> <span class="pre">boot</span>    <span class="pre">project.identities:</span> <span class="pre">bootloader</span>    <span class="pre">project.pkgs:</span>        <span class="pre">-</span> <span class="pre">libs/os</span>        <span class="pre">-</span> <span class="pre">libs/bootutil</span>        <span class="pre">-</span> <span class="pre">libs/nffs</span>        <span class="pre">-</span> <span class="pre">libs/console/stub</span>        <span class="pre">-</span> <span class="pre">libs/util</span>        <span class="pre">-</span> <span class="pre">libs/baselibc</span></code></p> |
| </div> |
| <div class="section" id="list-of-functions"> |
| <h2>List of Functions<a class="headerlink" href="#list-of-functions" title="Permalink to this headline">¶</a></h2> |
| <p>Documentation for libc functions is available from multiple places. One |
| example are the on-line manual pages at |
| <a class="reference external" href="#https://www.freebsd.org/cgi/man.cgi">https://www.freebsd.org/cgi/man.cgi</a>.</p> |
| <p>baselibc supports most libc functionality; malloc(), printf-family, |
| string handling, and conversion routines.</p> |
| <p>There is some functionality which is not available, e.g. support for |
| floating point numbers, and limited support for ‘long long’.</p> |
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