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-  <title>A memoization routine for GNU Make functions — Luke Shumaker</title>
+  <title>A memoization routine for GNU Make functions — Luke T. Shumaker</title>
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-<header><a href="/">Luke Shumaker</a> » <a href=/blog>blog</a> » make-memoize</header>
+<header><a href="/">Luke T. Shumaker</a> » <a href=/blog>blog</a> » make-memoize</header>
 <article>
-<h1 id="a-memoization-routine-for-gnu-make-functions">A memoization routine for GNU Make functions</h1>
-<p>I’m a big fan of <a href="https://www.gnu.org/software/make/">GNU Make</a>. I’m pretty knowledgeable about it, and was pretty active on the help-make mailing list for a while. Something that many experienced make-ers know of is John Graham-Cumming’s “GNU Make Standard Library”, or <a href="http://gmsl.sourceforge.net/">GMSL</a>.</p>
-<p>I don’t like to use it, as I’m capable of defining macros myself as I need them instead of pulling in a 3rd party dependency (and generally like to stay away from the kind of Makefile that would lean heavily on something like GMSL).</p>
-<p>However, one really neat thing that GMSL offers is a way to memoize expensive functions (such as those that shell out). I was considering pulling in GMSL for one of my projects, almost just for the <code>memoize</code> function.</p>
-<p>However, John’s <code>memoize</code> has a couple short-comings that made it unsuitable for my needs.</p>
+<h1 id="a-memoization-routine-for-gnu-make-functions">A memoization
+routine for GNU Make functions</h1>
+<p>I’m a big fan of <a href="https://www.gnu.org/software/make/">GNU
+Make</a>. I’m pretty knowledgeable about it, and was pretty active on
+the help-make mailing list for a while. Something that many experienced
+make-ers know of is John Graham-Cumming’s “GNU Make Standard Library”,
+or <a href="http://gmsl.sourceforge.net/">GMSL</a>.</p>
+<p>I don’t like to use it, as I’m capable of defining macros myself as I
+need them instead of pulling in a 3rd party dependency (and generally
+like to stay away from the kind of Makefile that would lean heavily on
+something like GMSL).</p>
+<p>However, one really neat thing that GMSL offers is a way to memoize
+expensive functions (such as those that shell out). I was considering
+pulling in GMSL for one of my projects, almost just for the
+<code>memoize</code> function.</p>
+<p>However, John’s <code>memoize</code> has a couple short-comings that
+made it unsuitable for my needs.</p>
 <ul>
 <li>Only allows functions that take one argument.</li>
-<li>Considers empty values to be unset; for my needs, an empty string is a valid value that should be cached.</li>
+<li>Considers empty values to be unset; for my needs, an empty string is
+a valid value that should be cached.</li>
 </ul>
-<p>So, I implemented my own, more flexible memoization routine for Make.</p>
+<p>So, I implemented my own, more flexible memoization routine for
+Make.</p>
 <pre><code># This definition of `rest` is equivalent to that in GMSL
 rest = $(wordlist 2,$(words $1),$1)
 
@@ -34,8 +49,13 @@ rest = $(wordlist 2,$(words $1),$1)
 _main = $(_$(func)_main)
 _hash = __memoized_$(_$(func)_hash)
 memoized = $(if $($(_hash)),,$(eval $(_hash) := _ $(_main)))$(call rest,$($(_hash)))</code></pre>
-<p>However, I later removed it from the Makefile, as I <a href="https://projects.parabola.nu/~lukeshu/maven-dist.git/commit/?id=fec5a7281b3824cb952aa0bb76bbbaa41eaafdf9">re-implemented</a> the bits that it memoized in a more efficient way, such that memoization was no longer needed, and the whole thing was faster.</p>
-<p>Later, I realized that my memoized routine could have been improved by replacing <code>func</code> with <code>$0</code>, which would simplify how the final function is declared:</p>
+<p>However, I later removed it from the Makefile, as I <a
+href="https://projects.parabola.nu/~lukeshu/maven-dist.git/commit/?id=fec5a7281b3824cb952aa0bb76bbbaa41eaafdf9">re-implemented</a>
+the bits that it memoized in a more efficient way, such that memoization
+was no longer needed, and the whole thing was faster.</p>
+<p>Later, I realized that my memoized routine could have been improved
+by replacing <code>func</code> with <code>$0</code>, which would
+simplify how the final function is declared:</p>
 <pre><code># This definition of `rest` is equivalent to that in GMSL
 rest = $(wordlist 2,$(words $1),$1)
 
@@ -52,14 +72,22 @@ _main = $(_$0_main)
 _hash = __memoized_$(_$0_hash)
 memoized = $(if $($(_hash)),,$(eval $(_hash) := _ $(_main)))$(call rest,$($(_hash)))</pre>
 <p></code></p>
-<p>Now, I’m pretty sure that should work, but I have only actually tested the first version.</p>
+<p>Now, I’m pretty sure that should work, but I have only actually
+tested the first version.</p>
 <h2 id="tldr">TL;DR</h2>
-<p>Avoid doing things in Make that would make you lean on complex solutions like an external memoize function.</p>
-<p>However, if you do end up needing a more flexible memoize routine, I wrote one that you can use.</p>
+<p>Avoid doing things in Make that would make you lean on complex
+solutions like an external memoize function.</p>
+<p>However, if you do end up needing a more flexible memoize routine, I
+wrote one that you can use.</p>
 
 </article>
 <footer>
-<p>The content of this page is Copyright © 2014 <a href="mailto:lukeshu@sbcglobal.net">Luke Shumaker</a>.</p>
+  <aside class="sponsor"><p>I'd love it if you <a class="em"
+      href="/sponsor/">sponsored me</a>.  It will allow me to continue
+      <a class="em" href="/imworkingon/">my work</a> on the GNU/Linux
+      ecosystem.  Thanks!</p></aside>
+
+<p>The content of this page is Copyright © 2014 <a href="mailto:lukeshu@lukeshu.com">Luke T. Shumaker</a>.</p>
 <p>This page is licensed under the <a href="http://www.wtfpl.net/txt/copying/">WTFPL-2</a> license.</p>
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