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<a href="https://gitlab.com/alebcay">Caleb Xu</a> created an issue:
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<h2 dir="auto">
<a id="user-content-description-of-problem" class="anchor" href="#description-of-problem" aria-hidden="true"></a>Description of problem:</h2>
<p dir="auto">Building <code>gnutls</code> 3.6.9 fails on macOS Sierra with error:</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">Undefined symbols for architecture x86_64:</span>
<span id="LC2" class="line" lang="plaintext"> "___get_cpuid_count", referenced from:</span>
<span id="LC3" class="line" lang="plaintext"> _register_x86_crypto in libaccelerated.a(x86-common.o)</span></code></pre>
<h2 dir="auto">
<a id="user-content-version-of-gnutls-used" class="anchor" href="#version-of-gnutls-used" aria-hidden="true"></a>Version of gnutls used:</h2>
<p dir="auto">3.6.9</p>
<h2 dir="auto">
<a id="user-content-distributor-of-gnutls-eg-ubuntu-fedora-rhel" class="anchor" href="#distributor-of-gnutls-eg-ubuntu-fedora-rhel" aria-hidden="true"></a>Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)</h2>
<p dir="auto">From source tarball, testing in CI for updating the Homebrew package manager with <code>gnutls</code> 3.6.9. Associated change on the Homebrew side: <a href="https://github.com/Homebrew/homebrew-core/pull/42779" rel="nofollow noreferrer noopener" target="_blank">https://github.com/Homebrew/homebrew-core/pull/42779</a></p>
<h2 dir="auto">
<a id="user-content-how-reproducible" class="anchor" href="#how-reproducible" aria-hidden="true"></a>How reproducible:</h2>
<p dir="auto">Steps to Reproduce:</p>
<ul dir="auto">
<li>Download and unpack 3.6.9 tarball (<a href="https://www.gnupg.org/ftp/gcrypt/gnutls/v3.6/gnutls-3.6.9.tar.xz" rel="nofollow noreferrer noopener" target="_blank">https://www.gnupg.org/ftp/gcrypt/gnutls/v3.6/gnutls-3.6.9.tar.xz</a>)</li>
<li><code>./configure --disable-dependency-tracking --disable-silent-rules --disable-static --prefix=#{prefix} --sysconfdir=#{etc} --with-default-trust-store-file=#{etc}/openssl/cert.pem --disable-guile --disable-heartbeat-support --with-p11-kit</code></li>
<li><code>make install</code></li>
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<a id="user-content-actual-results" class="anchor" href="#actual-results" aria-hidden="true"></a>Actual results:</h2>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">Undefined symbols for architecture x86_64:</span>
<span id="LC2" class="line" lang="plaintext"> "___get_cpuid_count", referenced from:</span>
<span id="LC3" class="line" lang="plaintext"> _register_x86_crypto in libaccelerated.a(x86-common.o)</span></code></pre>
<h2 dir="auto">
<a id="user-content-expected-results" class="anchor" href="#expected-results" aria-hidden="true"></a>Expected results:</h2>
<p dir="auto">Successful compilation.</p>
<hr>
<p dir="auto">Based on my limited understanding from googling this particular error, it seems that the symbol in question was added into <code>clang</code> starting in <code>llvm</code> 5.0.0. macOS Sierra ships with a toolchain derived from <code>llvm</code> 4.0.0, so the symbol is not available.</p>
<p dir="auto">I have attempted to use <code>gcc</code> to build it instead, but <code>gcc</code> does not seem to like some of the macOS Security framework that <code>gnutls</code> links against:</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">In file included from /System/Library/Frameworks/Security.framework/Headers/AuthSession.h:32,</span>
<span id="LC2" class="line" lang="plaintext"> from /System/Library/Frameworks/Security.framework/Headers/Security.h:43,</span>
<span id="LC3" class="line" lang="plaintext"> from system/certs.c:49:</span>
<span id="LC4" class="line" lang="plaintext">/System/Library/Frameworks/Security.framework/Headers/Authorization.h:192:7: error: variably modified 'bytes' at file scope</span>
<span id="LC5" class="line" lang="plaintext"> 192 | char bytes[kAuthorizationExternalFormLength];</span>
<span id="LC6" class="line" lang="plaintext"> | ^~~~~</span></code></pre>
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