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diff --git a/docs/posts/2024-03-15-setting-up-macos-for-8088-dos-dev.html b/docs/posts/2024-03-15-setting-up-macos-for-8088-dos-dev.html deleted file mode 100644 index 66de2fd..0000000 --- a/docs/posts/2024-03-15-setting-up-macos-for-8088-dos-dev.html +++ /dev/null @@ -1,362 +0,0 @@ -<!DOCTYPE html> -<html lang="en"> -<head> - - <meta http-equiv="X-UA-Compatible" content="IE=edge"> - <meta http-equiv="content-type" content="text/html; charset=utf-8"> - <meta name="viewport" content="width=device-width, initial-scale=1.0"> - <meta name="theme-color" content="#6a9fb5"> - - <title>Cross-Compiling Hello World for DOS on macOS</title> - - <!-- - <link rel="stylesheet" href="https://unpkg.com/latex.css/style.min.css" /> - --> - - <link rel="stylesheet" href="/assets/c-hyde.css"> - - <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Abril+Fatface"> - <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=PT+Sans:400,400italic,700"> - - <link rel="stylesheet" href="/assets/main.css"> - <meta name="viewport" content="width=device-width, initial-scale=1.0"> - <meta name="og:site_name" content="Navan Chauhan"> - <link rel="canonical" href="https://web.navan.dev/posts/2024-03-15-setting-up-macos-for-8088-dos-dev.html"> - <meta name="twitter:url" content="https://web.navan.dev/posts/2024-03-15-setting-up-macos-for-8088-dos-dev.html"> - <meta name="og:url" content="https://web.navan.dev/posts/2024-03-15-setting-up-macos-for-8088-dos-dev.html"> - <meta name="twitter:title" content="Cross-Compiling Hello World for DOS on macOS"> - <meta name="og:title" content="Cross-Compiling Hello World for DOS on macOS"> - <meta name="description" content="This goes through compiling Open Watcom 2 and creating simple hello-world exampls"> - <meta name="twitter:description" content="This goes through compiling Open Watcom 2 and creating simple hello-world exampls"> - <meta name="og:description" content="This goes through compiling Open Watcom 2 and creating simple hello-world exampls"> - <meta name="twitter:card" content="summary_large_image"> - <meta name="viewport" content="width=device-width, initial-scale=1.0"> - <link rel="shortcut icon" href="/images/favicon.png" type="image/png"> - <link href="/feed.rss" type="application/atom+xml" rel="alternate" title="Sitewide Atom feed"> - <meta name="twitter:image" content="https://web.navan.dev/images/opengraph/posts/2024-03-15-setting-up-macos-for-8088-dos-dev.png"> - <meta name="og:image" content="https://web.navan.dev/images/opengraph/posts/2024-03-15-setting-up-macos-for-8088-dos-dev.png"> - <meta name="google-site-verification" content="LVeSZxz-QskhbEjHxOi7-BM5dDxTg53x2TwrjFxfL0k"> - <script data-goatcounter="https://navanchauhan.goatcounter.com/count" - async src="//gc.zgo.at/count.js"></script> - <script defer data-domain="web.navan.dev" src="https://plausible.io/js/plausible.js"></script> - <link rel="manifest" href="/manifest.json"> - -</head> -<body class="theme-base-0d"> - <div class="sidebar"> - <div class="container sidebar-sticky"> - <div class="sidebar-about"> - <h1><a href="/">Navan</a></h1> - <p class="lead" id="random-lead">Alea iacta est.</p> - </div> - - <ul class="sidebar-nav"> - <li><a class="sidebar-nav-item" href="/about/">about/links</a></li> - <li><a class="sidebar-nav-item" href="/posts/">posts</a></li> - <li><a class="sidebar-nav-item" href="/3D-Designs/">3D designs</a></li> - <li><a class="sidebar-nav-item" href="/feed.rss">RSS Feed</a></li> - <li><a class="sidebar-nav-item" href="/colophon/">colophon</a></li> - </ul> - <div class="copyright"><p>© 2019-2024. Navan Chauhan <br> <a href="/feed.rss">RSS</a></p></div> - </div> -</div> - -<script> -let phrases = [ - "Something Funny", "Veni, vidi, vici", "Alea iacta est", "In vino veritas", "Acta, non verba", "Castigat ridendo mores", - "Cui bono?", "Memento vivere", "अहम् ब्रह्मास्मि", "अनुगच्छतु प्रवाहं", "चरन्मार्गान्विजानाति", "coq de cheval", "我愛啤酒" - ]; - -let new_phrase = phrases[Math.floor(Math.random()*phrases.length)]; - -let lead = document.getElementById("random-lead"); -lead.innerText = new_phrase; -</script> - <div class="content container"> - - <div class="post"> - <h1 id="cross-compiling-hello-world-for-dos-on-macos">Cross-Compiling Hello World for DOS on macOS</h1> - -<p>Technically this should work for any platform that OpenWatcom 2 supports compiling binaries for. Some instructions are based on <a rel="noopener" target="_blank" href="https://retrocoding.net/openwatcom-gateway-to-ancient-world-of-x86">a post at retrocoding.net</a>, - and <a rel="noopener" target="_blank" href="http://nuclear.mutantstargoat.com/articles/retrocoding/dos01-setup/#hello-world-program">John Tsiombikas's post</a></p> - -<h2 id="prerequisites">Prerequisites</h2> - -<p>You should already have XCode / Command Line Tools, and Homebrew installed. To compile Open Watcom for DOS you will need DOSBox (I use DOSBox-X).</p> - -<div class="codehilite"> -<pre><span></span><code>brew<span class="w"> </span>install<span class="w"> </span>--cask<span class="w"> </span>dosbox-x -</code></pre> -</div> - -<h2 id="compiling-open-watcom-v2">Compiling Open Watcom v2</h2> - -<p><em>If this process is super annoying, I might make a custom homebrew tap to build and install Open Watcom</em></p> - -<div class="codehilite"> -<pre><span></span><code>git<span class="w"> </span>clone<span class="w"> </span>https://github.com/open-watcom/open-watcom-v2 -cp<span class="w"> </span>open-watcom-v2/setvars.sh<span class="w"> </span>custom_setvars.sh -</code></pre> -</div> - -<p>Now, edit this <code>setvars.sh</code> file. My file looks like this:</p> - -<div class="codehilite"> -<pre><span></span><code><span class="ch">#!/bin/zsh</span> -<span class="nb">export</span><span class="w"> </span><span class="nv">OWROOT</span><span class="o">=</span><span class="s2">"/Users/navanchauhan/Developer/8088Stuff/open-watcom-v2"</span> -<span class="nb">export</span><span class="w"> </span><span class="nv">OWTOOLS</span><span class="o">=</span>CLANG -<span class="nb">export</span><span class="w"> </span><span class="nv">OWDOCBUILD</span><span class="o">=</span><span class="m">0</span> -<span class="nb">export</span><span class="w"> </span><span class="nv">OWGUINOBUILD</span><span class="o">=</span><span class="m">0</span> -<span class="nb">export</span><span class="w"> </span><span class="nv">OWDISTRBUILD</span><span class="o">=</span><span class="m">0</span> -<span class="nb">export</span><span class="w"> </span><span class="nv">OWDOSBOX</span><span class="o">=</span><span class="s2">"/Applications/dosbox-x.app/Contents/MacOS/dosbox-x"</span> -<span class="nb">export</span><span class="w"> </span><span class="nv">OWOBJDIR</span><span class="o">=</span>binbuildV01 -.<span class="w"> </span><span class="s2">"</span><span class="nv">$OWROOT</span><span class="s2">/cmnvars.sh"</span> -<span class="nb">echo</span><span class="w"> </span><span class="s2">"OWROOT=</span><span class="nv">$OWROOT</span><span class="s2">"</span> -<span class="nb">cd</span><span class="w"> </span><span class="s2">"</span><span class="nv">$OWROOT</span><span class="s2">"</span> -</code></pre> -</div> - -<p>Note, your <code>OWRTOOT</code> is definitely going to be in a different location.</p> - -<div class="codehilite"> -<pre><span></span><code><span class="nb">source</span><span class="w"> </span>./custom_setvars.sh -./build.sh -./build.sh<span class="w"> </span>rel -</code></pre> -</div> - -<p>This will build, and then copy everything to the <code>rel</code> directory inside <code>open-watcom-v2</code> directory. Since I ran this on an Apple Silicon Mac, - all the binaries for me are in the <code>armo64</code> directory. You can now move everything inside the rel folder to another location, or create a simple - script to init all variables whenever you want.</p> - -<p>I like having a script called <code>exportVarsForDOS.sh</code> </p> - -<div class="codehilite"> -<pre><span></span><code><span class="ch">#!/bin/zsh</span> - -<span class="nb">export</span><span class="w"> </span><span class="nv">WATCOM</span><span class="o">=</span>/Users/navanchauhan/Developer/8088Stuff/open-watcom-v2/rel -<span class="nb">export</span><span class="w"> </span><span class="nv">PATH</span><span class="o">=</span><span class="nv">$PATH</span>:<span class="nv">$WATCOM</span>/armo64 -<span class="nb">export</span><span class="w"> </span><span class="nv">EDDAT</span><span class="o">=</span><span class="nv">$WATCOM</span>/eddat - -<span class="c1"># For DOS 8088/8086 development</span> -<span class="nb">export</span><span class="w"> </span><span class="nv">INCLUDE</span><span class="o">=</span><span class="nv">$WATCOM</span>/h -<span class="nb">export</span><span class="w"> </span><span class="nv">LIB</span><span class="o">=</span><span class="nv">$WATCOM</span>/lib286<span class="w"> </span><span class="c1"># You don't really need this</span> -</code></pre> -</div> - -<p>Then, when you need to load up these variables, you can simply run <code>source exportVarsForDOS.sh</code> or <code>. exportVarsForDOS.sh</code></p> - -<h2 id="hello-world">Hello World</h2> - -<h3 id="buliding-without-any-makefiles">Buliding without any Makefiles</h3> - -<p>Create a new file called <code>example1.c</code></p> - -<div class="codehilite"> -<pre><span></span><code><span class="cp">#include</span><span class="cpf"><stdio.h></span> - -<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span> -<span class="w"> </span><span class="n">printf</span><span class="p">(</span><span class="s">"Hello World!"</span><span class="p">);</span> -<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span> -<span class="p">}</span> -</code></pre> -</div> - -<p>First we compile the code:</p> - -<div class="codehilite"> -<pre><span></span><code>$<span class="w"> </span>wcc<span class="w"> </span>example1.c -Open<span class="w"> </span>Watcom<span class="w"> </span>C<span class="w"> </span>x86<span class="w"> </span><span class="m">16</span>-bit<span class="w"> </span>Optimizing<span class="w"> </span>Compiler -Version<span class="w"> </span><span class="m">2</span>.0<span class="w"> </span>beta<span class="w"> </span>Mar<span class="w"> </span><span class="m">15</span><span class="w"> </span><span class="m">2024</span><span class="w"> </span><span class="m">13</span>:11:55 -Copyright<span class="w"> </span><span class="o">(</span>c<span class="o">)</span><span class="w"> </span><span class="m">2002</span>-2024<span class="w"> </span>The<span class="w"> </span>Open<span class="w"> </span>Watcom<span class="w"> </span>Contributors.<span class="w"> </span>All<span class="w"> </span>Rights<span class="w"> </span>Reserved. -Portions<span class="w"> </span>Copyright<span class="w"> </span><span class="o">(</span>c<span class="o">)</span><span class="w"> </span><span class="m">1984</span>-2002<span class="w"> </span>Sybase,<span class="w"> </span>Inc.<span class="w"> </span>All<span class="w"> </span>Rights<span class="w"> </span>Reserved. -Source<span class="w"> </span>code<span class="w"> </span>is<span class="w"> </span>available<span class="w"> </span>under<span class="w"> </span>the<span class="w"> </span>Sybase<span class="w"> </span>Open<span class="w"> </span>Watcom<span class="w"> </span>Public<span class="w"> </span>License. -See<span class="w"> </span>https://github.com/open-watcom/open-watcom-v2#readme<span class="w"> </span><span class="k">for</span><span class="w"> </span>details. -example1.c:<span class="w"> </span><span class="m">7</span><span class="w"> </span>lines,<span class="w"> </span>included<span class="w"> </span><span class="m">818</span>,<span class="w"> </span><span class="m">0</span><span class="w"> </span>warnings,<span class="w"> </span><span class="m">0</span><span class="w"> </span>errors -Code<span class="w"> </span>size:<span class="w"> </span><span class="m">19</span> -</code></pre> -</div> - -<p>Then, link to make an executable:</p> - -<div class="codehilite"> -<pre><span></span><code>$<span class="w"> </span>wlink<span class="w"> </span>name<span class="w"> </span>example1.exe<span class="w"> </span>system<span class="w"> </span>dos<span class="w"> </span>file<span class="w"> </span>example1.o -Open<span class="w"> </span>Watcom<span class="w"> </span>Linker<span class="w"> </span>Version<span class="w"> </span><span class="m">2</span>.0<span class="w"> </span>beta<span class="w"> </span>Mar<span class="w"> </span><span class="m">15</span><span class="w"> </span><span class="m">2024</span><span class="w"> </span><span class="m">13</span>:10:09 -Copyright<span class="w"> </span><span class="o">(</span>c<span class="o">)</span><span class="w"> </span><span class="m">2002</span>-2024<span class="w"> </span>The<span class="w"> </span>Open<span class="w"> </span>Watcom<span class="w"> </span>Contributors.<span class="w"> </span>All<span class="w"> </span>Rights<span class="w"> </span>Reserved. -Portions<span class="w"> </span>Copyright<span class="w"> </span><span class="o">(</span>c<span class="o">)</span><span class="w"> </span><span class="m">1985</span>-2002<span class="w"> </span>Sybase,<span class="w"> </span>Inc.<span class="w"> </span>All<span class="w"> </span>Rights<span class="w"> </span>Reserved. -Source<span class="w"> </span>code<span class="w"> </span>is<span class="w"> </span>available<span class="w"> </span>under<span class="w"> </span>the<span class="w"> </span>Sybase<span class="w"> </span>Open<span class="w"> </span>Watcom<span class="w"> </span>Public<span class="w"> </span>License. -See<span class="w"> </span>https://github.com/open-watcom/open-watcom-v2#readme<span class="w"> </span><span class="k">for</span><span class="w"> </span>details. -loading<span class="w"> </span>object<span class="w"> </span>files -searching<span class="w"> </span>libraries -creating<span class="w"> </span>a<span class="w"> </span>DOS<span class="w"> </span>executable<span class="w"> </span> -</code></pre> -</div> - -<p>If you want to test this executable, jump to the section titled <code>Testing with DOSBox-X</code> below.</p> - -<h3 id="simple-makefile">Simple Makefile</h3> - -<div class="codehilite"> -<pre><span></span><code><span class="nv">obj</span><span class="w"> </span><span class="o">=</span><span class="w"> </span>main.o<span class="w"> </span>hello.o -<span class="nv">bin</span><span class="w"> </span><span class="o">=</span><span class="w"> </span>tizts.com - -<span class="nv">CC</span><span class="w"> </span><span class="o">=</span><span class="w"> </span>wcc -<span class="nv">CFLAGS</span><span class="w"> </span><span class="o">=</span><span class="w"> </span>-0 -<span class="nv">LD</span><span class="w"> </span><span class="o">=</span><span class="w"> </span>wlink - -<span class="nf">$(bin)</span><span class="o">:</span><span class="w"> </span><span class="k">$(</span><span class="nv">obj</span><span class="k">)</span> -<span class="w"> </span><span class="k">$(</span>LD<span class="k">)</span><span class="w"> </span>name<span class="w"> </span><span class="nv">$@</span><span class="w"> </span>system<span class="w"> </span>dos<span class="w"> </span>file<span class="w"> </span>main.o<span class="w"> </span>file<span class="w"> </span>hello.o<span class="w"> </span> - -<span class="nf">.c.o</span><span class="o">:</span> -<span class="w"> </span><span class="k">$(</span>CC<span class="k">)</span><span class="w"> </span><span class="k">$(</span>CFLAGS<span class="k">)</span><span class="w"> </span>$< - -<span class="nf">clean</span><span class="o">:</span> -<span class="w"> </span>rm<span class="w"> </span><span class="k">$(</span>obj<span class="k">)</span><span class="w"> </span><span class="k">$(</span>bin<span class="k">)</span> -</code></pre> -</div> - -<p>Where, <code>main.c</code></p> - -<div class="codehilite"> -<pre><span></span><code><span class="kt">void</span><span class="w"> </span><span class="nf">hello</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span> - -<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span> -<span class="p">{</span> -<span class="w"> </span><span class="n">hello</span><span class="p">();</span> -<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span> -<span class="p">}</span> -</code></pre> -</div> - -<p>and <code>hello.c</code></p> - -<div class="codehilite"> -<pre><span></span><code><span class="cm">/* hello.c */</span> -<span class="cp">#include</span><span class="w"> </span><span class="cpf"><stdio.h></span> - -<span class="kt">void</span><span class="w"> </span><span class="nf">hello</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span> -<span class="p">{</span> -<span class="w"> </span><span class="n">printf</span><span class="p">(</span><span class="s">"Hello!"</span><span class="p">);</span> -<span class="p">}</span> -</code></pre> -</div> - -<p>To compile into <code>tizts.com</code> simply run <code>wmake</code></p> - -<div class="codehilite"> -<pre><span></span><code>$<span class="w"> </span>wmake -➜<span class="w"> </span>simple-cpp<span class="w"> </span>wmake -Open<span class="w"> </span>Watcom<span class="w"> </span>Make<span class="w"> </span>Version<span class="w"> </span><span class="m">2</span>.0<span class="w"> </span>beta<span class="w"> </span>Mar<span class="w"> </span><span class="m">15</span><span class="w"> </span><span class="m">2024</span><span class="w"> </span><span class="m">13</span>:10:16 -Copyright<span class="w"> </span><span class="o">(</span>c<span class="o">)</span><span class="w"> </span><span class="m">2002</span>-2024<span class="w"> </span>The<span class="w"> </span>Open<span class="w"> </span>Watcom<span class="w"> </span>Contributors.<span class="w"> </span>All<span class="w"> </span>Rights<span class="w"> </span>Reserved. -Portions<span class="w"> </span>Copyright<span class="w"> </span><span class="o">(</span>c<span class="o">)</span><span class="w"> </span><span class="m">1988</span>-2002<span class="w"> </span>Sybase,<span class="w"> </span>Inc.<span class="w"> </span>All<span class="w"> </span>Rights<span class="w"> </span>Reserved. -Source<span class="w"> </span>code<span class="w"> </span>is<span class="w"> </span>available<span class="w"> </span>under<span class="w"> </span>the<span class="w"> </span>Sybase<span class="w"> </span>Open<span class="w"> </span>Watcom<span class="w"> </span>Public<span class="w"> </span>License. -See<span class="w"> </span>https://github.com/open-watcom/open-watcom-v2#readme<span class="w"> </span><span class="k">for</span><span class="w"> </span>details. -<span class="w"> </span>wcc<span class="w"> </span>-0<span class="w"> </span>main.c -Open<span class="w"> </span>Watcom<span class="w"> </span>C<span class="w"> </span>x86<span class="w"> </span><span class="m">16</span>-bit<span class="w"> </span>Optimizing<span class="w"> </span>Compiler -Version<span class="w"> </span><span class="m">2</span>.0<span class="w"> </span>beta<span class="w"> </span>Mar<span class="w"> </span><span class="m">15</span><span class="w"> </span><span class="m">2024</span><span class="w"> </span><span class="m">13</span>:11:55 -Copyright<span class="w"> </span><span class="o">(</span>c<span class="o">)</span><span class="w"> </span><span class="m">2002</span>-2024<span class="w"> </span>The<span class="w"> </span>Open<span class="w"> </span>Watcom<span class="w"> </span>Contributors.<span class="w"> </span>All<span class="w"> </span>Rights<span class="w"> </span>Reserved. -Portions<span class="w"> </span>Copyright<span class="w"> </span><span class="o">(</span>c<span class="o">)</span><span class="w"> </span><span class="m">1984</span>-2002<span class="w"> </span>Sybase,<span class="w"> </span>Inc.<span class="w"> </span>All<span class="w"> </span>Rights<span class="w"> </span>Reserved. -Source<span class="w"> </span>code<span class="w"> </span>is<span class="w"> </span>available<span class="w"> </span>under<span class="w"> </span>the<span class="w"> </span>Sybase<span class="w"> </span>Open<span class="w"> </span>Watcom<span class="w"> </span>Public<span class="w"> </span>License. -See<span class="w"> </span>https://github.com/open-watcom/open-watcom-v2#readme<span class="w"> </span><span class="k">for</span><span class="w"> </span>details. -main.c<span class="o">(</span><span class="m">8</span><span class="o">)</span>:<span class="w"> </span>Warning!<span class="w"> </span>W138:<span class="w"> </span>No<span class="w"> </span>newline<span class="w"> </span>at<span class="w"> </span>end<span class="w"> </span>of<span class="w"> </span>file -main.c:<span class="w"> </span><span class="m">8</span><span class="w"> </span>lines,<span class="w"> </span>included<span class="w"> </span><span class="m">53</span>,<span class="w"> </span><span class="m">1</span><span class="w"> </span>warnings,<span class="w"> </span><span class="m">0</span><span class="w"> </span>errors -Code<span class="w"> </span>size:<span class="w"> </span><span class="m">12</span> -<span class="w"> </span>wcc<span class="w"> </span>-0<span class="w"> </span>hello.c -Open<span class="w"> </span>Watcom<span class="w"> </span>C<span class="w"> </span>x86<span class="w"> </span><span class="m">16</span>-bit<span class="w"> </span>Optimizing<span class="w"> </span>Compiler -Version<span class="w"> </span><span class="m">2</span>.0<span class="w"> </span>beta<span class="w"> </span>Mar<span class="w"> </span><span class="m">15</span><span class="w"> </span><span class="m">2024</span><span class="w"> </span><span class="m">13</span>:11:55 -Copyright<span class="w"> </span><span class="o">(</span>c<span class="o">)</span><span class="w"> </span><span class="m">2002</span>-2024<span class="w"> </span>The<span class="w"> </span>Open<span class="w"> </span>Watcom<span class="w"> </span>Contributors.<span class="w"> </span>All<span class="w"> </span>Rights<span class="w"> </span>Reserved. -Portions<span class="w"> </span>Copyright<span class="w"> </span><span class="o">(</span>c<span class="o">)</span><span class="w"> </span><span class="m">1984</span>-2002<span class="w"> </span>Sybase,<span class="w"> </span>Inc.<span class="w"> </span>All<span class="w"> </span>Rights<span class="w"> </span>Reserved. -Source<span class="w"> </span>code<span class="w"> </span>is<span class="w"> </span>available<span class="w"> </span>under<span class="w"> </span>the<span class="w"> </span>Sybase<span class="w"> </span>Open<span class="w"> </span>Watcom<span class="w"> </span>Public<span class="w"> </span>License. -See<span class="w"> </span>https://github.com/open-watcom/open-watcom-v2#readme<span class="w"> </span><span class="k">for</span><span class="w"> </span>details. -hello.c:<span class="w"> </span><span class="m">8</span><span class="w"> </span>lines,<span class="w"> </span>included<span class="w"> </span><span class="m">818</span>,<span class="w"> </span><span class="m">0</span><span class="w"> </span>warnings,<span class="w"> </span><span class="m">0</span><span class="w"> </span>errors -Code<span class="w"> </span>size:<span class="w"> </span><span class="m">17</span> -<span class="w"> </span>wlink<span class="w"> </span>name<span class="w"> </span>tizts.com<span class="w"> </span>system<span class="w"> </span>dos<span class="w"> </span>file<span class="w"> </span>main.o<span class="w"> </span>file<span class="w"> </span>hello.o -Open<span class="w"> </span>Watcom<span class="w"> </span>Linker<span class="w"> </span>Version<span class="w"> </span><span class="m">2</span>.0<span class="w"> </span>beta<span class="w"> </span>Mar<span class="w"> </span><span class="m">15</span><span class="w"> </span><span class="m">2024</span><span class="w"> </span><span class="m">13</span>:10:09 -Copyright<span class="w"> </span><span class="o">(</span>c<span class="o">)</span><span class="w"> </span><span class="m">2002</span>-2024<span class="w"> </span>The<span class="w"> </span>Open<span class="w"> </span>Watcom<span class="w"> </span>Contributors.<span class="w"> </span>All<span class="w"> </span>Rights<span class="w"> </span>Reserved. -Portions<span class="w"> </span>Copyright<span class="w"> </span><span class="o">(</span>c<span class="o">)</span><span class="w"> </span><span class="m">1985</span>-2002<span class="w"> </span>Sybase,<span class="w"> </span>Inc.<span class="w"> </span>All<span class="w"> </span>Rights<span class="w"> </span>Reserved. -Source<span class="w"> </span>code<span class="w"> </span>is<span class="w"> </span>available<span class="w"> </span>under<span class="w"> </span>the<span class="w"> </span>Sybase<span class="w"> </span>Open<span class="w"> </span>Watcom<span class="w"> </span>Public<span class="w"> </span>License. -See<span class="w"> </span>https://github.com/open-watcom/open-watcom-v2#readme<span class="w"> </span><span class="k">for</span><span class="w"> </span>details. -loading<span class="w"> </span>object<span class="w"> </span>files -searching<span class="w"> </span>libraries -creating<span class="w"> </span>a<span class="w"> </span>DOS<span class="w"> </span>executable -</code></pre> -</div> - -<h3 id="using-cmake">Using CMake</h3> - -<p>Create a file called <code>CMakeLists.txt</code></p> - -<div class="codehilite"> -<pre><span></span><code><span class="nb">project</span><span class="p">(</span><span class="s">hello</span><span class="p">)</span> - -<span class="nb">set</span><span class="p">(</span><span class="s">SOURCES</span><span class="w"> </span><span class="s">abc.c</span><span class="p">)</span> - -<span class="nb">add_executable</span><span class="p">(</span><span class="s">hello</span><span class="w"> </span><span class="o">${</span><span class="nv">SOURCES</span><span class="o">}</span><span class="p">)</span> -</code></pre> -</div> - -<p>Where, <code>abc.c</code> is:</p> - -<div class="codehilite"> -<pre><span></span><code><span class="cp">#include</span><span class="w"> </span><span class="cpf"><stdio.h></span> - -<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span> -<span class="w"> </span><span class="n">printf</span><span class="p">(</span><span class="s">"Does this work?"</span><span class="p">);</span> -<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span> -<span class="p">}</span> -</code></pre> -</div> - -<div class="codehilite"> -<pre><span></span><code>mkdir<span class="w"> </span>build -<span class="nb">cd</span><span class="w"> </span>build -</code></pre> -</div> - -<p>And build using CMake</p> - -<pre><code>cmake -DCMAKE_SYSTEM_NAME=DOS -DCMAKE_SYSTEM_PROCESSOR=I86 -DCMAKE_C_FLAGS="-0 -bt=dos -d0 -oaxt" -G "Watcom WMake" ../.. -</code></pre> - -<p>There you have it. Three different ways to compile a C program on a macOS device in 2024 that can run on an IBM PC 5150 (which was released in 1981!)</p> - -<h2 id="testing-with-dosbox-x">Testing with DOSBox-X</h2> - -<div class="codehilite"> -<pre><span></span><code>cp<span class="w"> </span>example1.exe<span class="w"> </span>~/Downloads -/Applications/dosbox-x.app/Contents/MacOS/dosbox-x -</code></pre> -</div> - -<p>In DOSBox-X we now mount the <code>~/Downloads</code> folder as our <code>C:</code> drive</p> - -<pre><code>mount C ~/Downloads -</code></pre> - -<p>Switch to the C drive</p> - -<pre><code>C: -</code></pre> - -<p>Run the program:</p> - -<pre><code>example1 -</code></pre> - -<p><img src="/assets/posts/dosbox/hello-world.png" alt="Running our program in DOSBox-X" /></p> - -<p><em>My DOSBox setup might look slightly different than yours...</em></p> - - </div> - <blockquote>If you have scrolled this far, consider subscribing to my mailing list <a href="https://listmonk.navan.dev/subscription/form">here.</a> You can subscribe to either a specific type of post you are interested in, or subscribe to everything with the "Everything" list.</blockquote> - <script data-isso="https://comments.navan.dev/" - src="https://comments.navan.dev/js/embed.min.js"></script> - <div id="isso-thread"> - <noscript>Javascript needs to be activated to view comments.</noscript> - </div> - - </div> - <script src="assets/manup.min.js"></script> - <script src="/pwabuilder-sw-register.js"></script> -</body> -</html>
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