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<h1 id="compiling-obnc-on-macos">Compiling OBNC on macOS</h1>
<p>By R. S. Doiel, 2020-05-06</p>
<p>This is the sixth post in the <a
href="../../04/11/Mostly-Oberon.html">Mostly Oberon</a> series. Mostly
Oberon documents my exploration of the Oberon Language, Oberon System
and the various rabbit holes I will inevitably fall into.</p>
<p>Compiling OBNC v0.16.1 on macOS (10.13.6) using MacPorts (2.6.2) is
straight forward if you have the required dependencies and environment
setup up. Below are my notes to get everything working.</p>
<h2 id="prerequisites">Prerequisites</h2>
<ul>
<li>OBNC v0.16.1</li>
<li>SDL v1.2</li>
<li>Boehm-Demers-Weiser GC</li>
<li>A C compiler and linker (OBNC uses this to generate machine specific
code)</li>
</ul>
<h3 id="sdl-1.2">SDL 1.2</h3>
<p>MacPorts has libsdl 1.2 available as a package called “libsdl” (not
surprisingly). There are other versions of the SDL available in ports
but this is the one we’re using.</p>
<pre><code>
  sudo port install libsdl
</code></pre>
<h3 id="the-boehm-demers-weiser-gc">The Boehm-Demers-Weiser GC</h3>
<p>You need to install the Boehm-Demers-Weiser GC installed. Using
MacPorts it is almost as easy as installing under Debian. The package is
less obviously named than under Debian. The package you want is
“beohmgc”.</p>
<pre><code>
  sudo port install boehmgc
</code></pre>
<p>More info on the GC.</p>
<ul>
<li><a href="https://www.hboehm.info/gc/">The Boehm-Demers-Weiser
GC</a></li>
<li><a href="https://ports.macports.org/port/boehmgc/summary">MacPorts
page</a></li>
</ul>
<h3 id="c-compiler-and-linker">C compiler and linker</h3>
<p>XCode is provides a C compiler and linker. That is what is installed
on my machine. It can be a bit of a pain at times with obscure errors,
particularly with regards to the linker. Your milleage may very. I know
you can install other C compilers (e.g. Clang) but I haven’t tried them
yet.</p>
<h2 id="setting-up-my-environment">Setting up my environment</h2>
<p>You need to update your CC variables to find the header and shared
library files for compilation of obnc with <code>build</code>. (I added
these to my <code>.bash_profile</code>). New Macs ships with zsh and
your settings might be in a different location. MacPorts puts its
libraries under the <code>/opt/local</code> directory.</p>
<pre><code>
  export C_INCLUDE_PATH="/usr/include:/usr/local/include:/opt/local/include"
  export LIBRARY_PATH="/usr/lib:/usr/local/lib:/opt/local/lib"
  export LD_LIBRARY_PATH="/usr/lib:/usr/local/lib:/opt/local/lib"
</code></pre>
<h2 id="obnc-environment-variables">OBNC environment variables</h2>
<p>This follows’ Karl’s docs. Additionally if you install OBNC extlib
so you can do POSIX shell programs you’ll need to set your
<code>OBNC_IMPORT_PATH</code> environment. An example of including a
default install location and local home directory location.</p>
<pre><code>
  export OBNC_IMPORT_PATH="/usr/local/lib/obnc:$HOME/lib/obnc"
</code></pre>
<h3 id="next-and-previous">Next and Previous</h3>
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<li>Next <a href="../09/Oberon-07-and-the-filesystem.html">Oberon-07 and
the file system</a></li>
<li>Previous <a href="../01/Combining-Oberon-and-C.html">Combining
Oberon-07 and C</a></li>
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