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Work on improving the build system.
author David Barts <davidb@stashtea.com>
date Fri, 24 Apr 2020 19:45:57 -0700
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children 89d7f4d91f67
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1 <!DOCTYPE html>
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2 <!-- Skeleton or template web page, in the standard style. -->
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3 <html>
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4 <head>
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5 <meta http-equiv="content-type" content="text/html; charset=UTF-8">
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6 <title>Building JpegWasher</title>
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7 <style>
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8 html { font-family: "TeX Gyre Schola", serif; }
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9 h1, h2, h3, h4, h5, h6 { font-family: "Avenir Next", sans-serif; }
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10 pre, code, kbd, samp { font-family: "Menlo", monospace; ; font-size: 85%; }
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11 </style>
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12 </head>
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13 <body>
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14 <h1>Building JpegWasher</h1>
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15 <h2>Prerequisites</h2>
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16 <ul>
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17 <li><a href="https://ant.apache.org/">Apache Ant</a>, with the following
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18 extensions (note that the extensions are already present in the lib
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19 subdirectory, but you will need to install Ant).</li>
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20 <ul>
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21 <li><a href="http://ant-contrib.sourceforge.net/">Ant-Contrib</a></li>
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22 <li><a href="https://github.com/UltraMixer/JarBundler">JarBundler</a>
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23 (if building on a Mac)</li>
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24 <li><a href="http://launch4j.sourceforge.net/">launch4j</a> (if building
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25 on Windows)</li>
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26 </ul>
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27 <li>Java JDK 1.8 or better (see notes).</li>
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28 <li>Kotlin</li>
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29 <li>Exiv2</li>
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30 <li>A C++ Compiler</li>
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31 <li>Make (Nmake on Windows)</li>
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32 </ul>
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33 <h2>JpegWasher Is Not Pure Java</h2>
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34 <p>This means two things: </p>
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35 <ol>
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36 <li>You need a C++ compiler in addition to a Kotlin compiler (and a Java
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37 one) to build&nbsp; JpegWasher.</li>
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38 <li>The result of a build will run only on the architecture you built it
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39 on.</li>
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40 </ol>
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41 <p>It <em>is</em> possible to create a semi-portable JAR that runs on both
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42 Linux and Windows (it contains both <code>*.so</code> libraries and <code>*.dll</code>
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43 ones, and loads the correct ones at run time, see <code>linwin.jar</code>),
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44 but the process for doing so is not totally automated. It is alas not
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45 possible to support the Macintosh in the same JAR as well, because a Mac
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46 app in Java 1.8 requires making a few nonportable, Apple-only API calls,
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47 whose presence will cause <code>ClassNotFoundException</code> to be
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48 thrown at runtime on non-Macintosh systems.</p>
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49 <p>As to why, the answer is simple: Try as I could, I could not find any
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50 pure Java libraries that could read <em>and write</em> image metadata.
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51 Therefore I had to use a C++ library.</p>
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52 <h2>Which Version of Java to Use?</h2>
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53 <p>In short, Java 1.8. Most systems don't yet have OpenJDK 11 or greater
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54 installed, so using a compiler newer than 1.8 is asking for trouble. All
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55 code <em>should</em> build on OpenJDK 11 or greater, with the exception
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56 of the OS-dependent code for the Macintosh (which will have to be recoded
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57 to use the <code>java.awt.Desktop</code> class). The latter would be a
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58 net win, as it is portable, and would spell the death of the only bit of
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59 OS-dependent Kotlin code in this application.</p>
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60 <p>In another year or two, I will probably make OpenJDK 11 or greater the
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61 preferred version.</p>
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62 </body>
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63 </html>