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<a href="https://gitlab.com/cllang" style="color: #1068bf;">Clemens Lang</a>
<a href="https://gitlab.com/gnutls/gnutls/-/issues/1370#note_967832583" style="color: #1068bf;">commented</a>:
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<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">Found it. The problem is that in <a href="/gnutls/gnutls/-/blob/master/gnutls/gnutls/-/blob/master/lib/accelerated/x86/x86-common.c#L51-56" style="color: #1068bf; margin-top: 0;">lib/accelerated/x86/x86-common.c</a>, <code style='font-size: 90%; color: #1f1f1f; word-wrap: break-word; background-color: #f0f0f0; border-radius: 4px; font-weight: inherit; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>_gnutls_x86_cpuid_s</code> is declared with <code style='font-size: 90%; color: #1f1f1f; word-wrap: break-word; background-color: #f0f0f0; border-radius: 4px; font-weight: inherit; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>__attribute__((visibility("hidden")))</code> if <code style='font-size: 90%; color: #1f1f1f; word-wrap: break-word; background-color: #f0f0f0; border-radius: 4px; font-weight: inherit; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>__GNUC__</code> is defined (which clang does afaik).</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">Combine that with <a href="https://gitlab.com/gnutls/gnutls/-/blob/master/lib/Makefile.am#L219-223" style="color: #1068bf; margin-top: 0;">lib/Makefile.am</a>, which exports all symbols matching <code style='font-size: 90%; color: #1f1f1f; word-wrap: break-word; background-color: #f0f0f0; border-radius: 4px; font-weight: inherit; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>^(gnutls|_gnutls).*</code> if <code style='font-size: 90%; color: #1f1f1f; word-wrap: break-word; background-color: #f0f0f0; border-radius: 4px; font-weight: inherit; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>HAVE_LD_VERSION_SCRIPT</code> is false (which it is on macOS), this attempts to export a hidden symbol, which fails.</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">I see two options:</p>
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<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">Don't make <code style='font-size: 90%; color: #1f1f1f; word-wrap: break-word; background-color: #f0f0f0; border-radius: 4px; margin-top: 0; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>_gnutls_x86_cpuid_s</code> hidden unless <code style='font-size: 90%; color: #1f1f1f; word-wrap: break-word; background-color: #f0f0f0; border-radius: 4px; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>HAVE_LD_VERSION_SCRIPT</code> is defined, or</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">Rename <code style='font-size: 90%; color: #1f1f1f; word-wrap: break-word; background-color: #f0f0f0; border-radius: 4px; margin-top: 0; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>_gnutls_x86_cpuid_s</code> to not match the export regex.</li>
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