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POSkipping incompatible zlib dll
 

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    <p><strong>Situation:</strong> I have many gzipped input files that I want to process in a c program. I can extract each of them each time i need them but this takes a lot of time, so I would like to use in memory extraction. As a test case i downloaded the zlib sources from <a href="http://zlib.net/" rel="nofollow noreferrer">http://zlib.net/</a> and tried to compile the example zpipe.c</p> <p><strong>Problem:</strong> When I compile zpipe.c using:</p> <pre><code>x86_64-w64-mingw32-gcc -Wall -O3 zpipe.c -o zpipe -L. -lzlib1 </code></pre> <p>I get the error:</p> <pre><code>x86_64-w64-mingw32/bin/ld.exe: skipping incompatible ./zlib1.dll when searching for -lzlib1 x86_64-w64-mingw32/4.5.4/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lzlib1 </code></pre> <p><strong>What I think is the problem</strong> (I got this from <a href="https://stackoverflow.com/questions/3550571/skipping-incompatible-error-when-linking">Skipping incompatible error when linking</a>)</p> <p>I try to link a 32 bit dll while I compile in 64 bit code. When i look at <a href="http://zlib.net/zlib_faq.html#faq26" rel="nofollow noreferrer">http://zlib.net/zlib_faq.html#faq26</a> it is said that zlib is tested on 64 bit machines, but I guess this means you still compile 32 bit code. Note that I compile zpipe.c (provided in the zlib source), so i'm sure the inclusions are all ok. I put the zlib1.dll in the compilation directory.</p> <p><strong>What did I do/find:</strong> Among others I found 2 good examples (however with both of them I have the problem described above)</p> <ul> <li><a href="http://www.codeguru.com/cpp/cpp/algorithms/compression/article.php/c11735" rel="nofollow noreferrer">http://www.codeguru.com/cpp/cpp/algorithms/compression/article.php/c11735</a></li> <li><a href="http://bobobobo.wordpress.com/2008/02/23/how-to-use-zlib/" rel="nofollow noreferrer">http://bobobobo.wordpress.com/2008/02/23/how-to-use-zlib/</a></li> </ul> <p>And I looked at other questions, such as:</p> <ul> <li><a href="https://stackoverflow.com/questions/3254675/trying-to-compile-program-that-uses-zlib-link-unresolved-error">Trying to compile program that uses zlib. Link unresolved error</a></li> <li><a href="https://stackoverflow.com/questions/3119714/skipping-incompatible-libraries-at-compile">Skipping Incompatible Libraries at compile</a></li> </ul> <p>I also build a dll myself in vc 2010, however, all project configurations in the zlib 1.26 source are for a 32 bit configuration. So after I build a dll, I have the same error as above.</p> <p>A long story so a <strong>quick summary of my questions</strong>:</p> <ol> <li>Is there something I do wrong during compilation?</li> <li>Is it correct that I will never be able to use the zlib1 dll when I compile in 64 bit?</li> <li>And most important: Can I somehow compile a 64 bit version of zlib myself (using for example these <a href="http://msdn.microsoft.com/en-us/library/9yb4317s.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/9yb4317s.aspx</a> instructions), or are these already available somewhere (I was not able to find these until now)?</li> </ol> <p>Thank you all for your time!</p>
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