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<h1 class="post-title">Getting Pacaur Working on a Raspberry Pi 4 with Manjaro ARM or Arch Linux</h1>
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<time datetime="20-12-01" class="post-date">Tuesday, December 01 2020</time>
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<hr>
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<p>I recently installed Manjaro ARM (based on Arch Linux ARM) on a Raspberry Pi 4.
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I used some standard commands to start to add the <code class="language-plaintext highlighter-rouge">pacaur</code> package so I can easily retrieve <a href="https://wiki.archlinux.org/index.php/Arch_User_Repository">AUR packages</a> without needing to do it manually.
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Unfortunately, there is a small problem with compiling this on ARM.</p>
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<h2 id="always_inline">always_inline</h2>
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<p>To setup the install for <code class="language-plaintext highlighter-rouge">pacaur</code>, I first needed to download <a href="https://aur.archlinux.org/packages/auracle-git">auracle-git</a> AUR package manually.
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I ran into an error when compiling this package.</p>
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<p>But first, my setup:</p>
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<pre class="terminal">
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$ git clone https://aur.archlinux.org/auracle-git
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$ cd auracle-git
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$ makepkg -sri
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</pre>
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<p>Around half way through compiling this project, I got this cryptic message telling me there was a “target specific option mismatch”…Whatever that means.
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The full error is below, hopefully that helps my chances on the search engines.</p>
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<pre class="terminal">
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In file included from ../subprojects/abseil-cpp-20200225.2/absl/random/internal/randen_hwaes.cc:225:
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/usr/lib/gcc/aarch64-unknown-linux-gnu/9.3.0/include/arm_neon.h: In function 'Vector128 {anonymous}::AesRound(const Vector128&, const Vector128&)':
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/usr/lib/gcc/aarch64-unknown-linux-gnu/9.3.0/include/arm_neon.h:12452:1: error: inlining failed in call to always_inline 'uint8x16_t vaesmcq_u8(uint8x16_t)': target specific option mismatch
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12452 | vaesmcq_u8 (uint8x16_t data)
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</pre>
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<p>Luckily, there is a very easy fix for this.
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The user redfish <a href="https://aur.archlinux.org/packages/auracle-git#comment-762117">helpfully pointed out</a>
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on the <code class="language-plaintext highlighter-rouge">auracle-git</code> package page that you need to add a special make option to your <code class="language-plaintext highlighter-rouge">/etc/make.conf</code> file to make this work.</p>
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<p>His solution, as commented is like so:</p>
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<blockquote>
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<p>If you get this error when building for ARM aarch64:</p>
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<p>(insert error message from before)</p>
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<p>Then check that in /etc/makepkg.conf CFLAGS and CXXFLAGS have the +crypto suffix in -march flag, like -march=armv8-a+crypto (the base identifier may very depending on your hardware)</p>
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</blockquote>
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<p>Basically, there is a file on Linux: <code class="language-plaintext highlighter-rouge">/etc/makepkg.conf</code> which tells your computer how to compile <em>all</em> programs on the system.
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By default the Manjaro ARM (RPi4) edition has the following relevant lines in <code class="language-plaintext highlighter-rouge">makepkg.conf</code>.</p>
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<pre class="file">
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CFLAGS="-march=armv8-a -O2 -pipe -fstack-protector-strong -fno-plt"
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CXXFLAGS="-march=armv8-a -O2 -pipe -fstack-protector-strong -fno-plt"
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</pre>
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<p>What Mr. redfish is telling us is that we must add ‘+crypto’ to the end of the -march compiler flag so that our compiler will know how to inline that pesky vaesmcq_u8 function.</p>
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<p>So in the end, your <code class="language-plaintext highlighter-rouge">makepkg.conf</code>’s relevant lines will look like so:</p>
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<pre class="file">
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CFLAGS="-march=armv8-a+crypto -O2 -pipe -fstack-protector-strong -fno-plt"
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CXXFLAGS="-march=armv8-a+crypto -O2 -pipe -fstack-protector-strong -fno-plt"
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</pre>
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<h2 id="why">Why?</h2>
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<p>Redfish continues:</p>
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<blockquote>
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<p>Build of abseil-cpp package works because it uses CMake which adds the correct -march flag regardless of makepkg.conf, whereas when abseil-cpp is build as a subproject within this package, it uses meson, which does not add the flag and thus fails with the above error.</p>
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</blockquote>
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<p>In other words, one of the dependencies pulled in with auracle is not compiling without this special compiler flag enabled.</p>
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<h2 id="conclusion">Conclusion</h2>
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<p>Thanks to redfish for posting this solution to the forums!
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Would’ve been quite the rabbit hole for me to figure out how to do that.
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In fact, it is very likely I would have never figured that one out.</p>
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<p>After this issue is resolved, the installation of <code class="language-plaintext highlighter-rouge">pacaur</code> goes as expected. Nice and easy!
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Pacuar will compile on any architecture so it’s smooth sailing from here.</p>
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<p>Happy hacking!</p>
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