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<a href="https://gitlab.com/ametzler">Andreas Metzler</a>
commented on a
<a href="https://gitlab.com/gnutls/gnutls/issues/818#note_202264295">discussion</a>:
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<p dir="auto">When openssl is built, aesni-x86.s is not generated by a simple</p>
<blockquote dir="auto">
<p>CC="gcc" /usr/bin/perl ../crypto/aes/asm/aesni-x86.pl elf crypto/aes/aesni-x86.s</p>
</blockquote>
<p dir="auto">the respective build.info file reads</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext"> GENERATE[aesni-x86.s]=asm/aesni-x86.pl \</span>
<span id="LC2" class="line" lang="plaintext"> $(PERLASM_SCHEME) $(LIB_CFLAGS) $(LIB_CPPFLAGS) $(PROCESSOR)</span></code></pre>
<p dir="auto">which expands to e.g.</p>
<blockquote dir="auto">
<p>CC="gcc" /usr/bin/perl ../crypto/aes/asm/aesni-x86.pl elf -fPIC -pthread -Wa,--noexecstack -Wall -Wa,--noexecstack -g -O2 -fdebug-prefix-map=/dev/shm/GNUTLS/openssl-1.1.1c=. -fstack-protector-strong -Wformat -Werror=format-security -DOPENSSL_USE_NODELETE -DL_ENDIAN -DOPENSSL_PIC -DOPENSSL_CPUID_OBJ -DOPENSSL_BN_ASM_PART_WORDS -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DRC4_ASM -DMD5_ASM -DRMD160_ASM -DAES_ASM -DVPAES_ASM -DWHIRLPOOL_ASM -DGHASH_ASM -DECP_NISTZ256_ASM -DPOLY1305_ASM -DOPENSSLDIR=""/usr/lib/ssl"" -DENGINESDIR=""/usr/lib/i386-linux-gnu/engines-1.1"" -DNDEBUG -Wdate-time -D_FORTIFY_SOURCE=2 crypto/aes/aesni-x86.s</p>
</blockquote>
<p dir="auto">Playing around a little bit we find that the <code>-fPIC</code> is significant, adding/removing it triggers exactly the one-line change mentioned above. And indeed we find this in perlasm/x86asm.pl:</p>
<pre class="code highlight js-syntax-highlight perl" lang="perl" v-pre="true"><code><span id="LC1" class="line" lang="perl"><span class="nv">$pic</span><span class="o">=</span><span class="mi">0</span><span class="p">;</span></span>
<span id="LC2" class="line" lang="perl"><span class="k">for</span> <span class="p">(</span><span class="nv">@ARGV</span><span class="p">)</span> <span class="p">{</span> <span class="nv">$pic</span><span class="o">=</span><span class="mi">1</span> <span class="k">if</span> <span class="p">(</span><span class="sr">/\-[fK]PIC/i</span><span class="p">);</span> <span class="p">}</span></span></code></pre>
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