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POCompiling native C++ module for Node.js, linking to openSSL/libcrypto fails
 

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  1. POCompiling native C++ module for Node.js, linking to openSSL/libcrypto fails
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    <p>I'm using Cygwin/Windows and I'm trying to build a native module for node.js. I intend to make use of the OpenSSL Library. I have installed openssl from the Cygwin package manager.</p> <p>I have the following lines in my .cc file:</p> <pre><code>#include &lt;openssl/dh.h&gt; </code></pre> <p>and</p> <pre><code> DH* public_dh_key = DH_new(); </code></pre> <p>But when I try to link/compile it with <code>node-waf configure build</code>, I get:</p> <pre><code>undefined reference to _DH_new </code></pre> <p><strong>Edit:</strong></p> <p>Part of the build script:</p> <pre><code>def build(bld): ppp= bld.new_task_gen('cxx', 'shlib', 'node_addon') ppp.cxxflags = ["-g", "-D_FILE_OFFSET_BITS=64", "-D_LARGEFILE_SOURCE", "-Wall", "-L/usr/lib", "-lssl"] ... </code></pre> <p>(I have tried adding -lcrypto but still get the same result. I have also tried various combinations of "-lssl32","-lssleay32","-llibeay32".)</p> <p><strong>Edit</strong></p> <p>Output of the build script:</p> <pre><code>$ node-waf configure build Checking for program g++ or c++ : /usr/bin/g++ Checking for program cpp : /usr/bin/cpp Checking for program ar : /usr/bin/ar Checking for program ranlib : /usr/bin/ranlib Checking for g++ : ok Checking for node path : not found Checking for node prefix : ok /usr/local 'configure' finished successfully (0.330s) Waf: Entering directory `/usr/src/build' [1/2] cxx: ppp.cc -&gt; build/default/ppp_1.o [2/2] cxx_link: build/default/ppp_1.o -&gt; build/default/ppp.node build/default/libppp.dll.a Creating library file: default/libppp.dll.a default/ppp_1.o:/usr/src/build/../ppp.cc:289: undefined reference to `_HMAC' collect2: ld returned 1 exit status Waf: Leaving directory `/usr/src/build' Build failed: -&gt; task failed (err #1): {task: cxx_link ppp_1.o -&gt; ppp.node,libppp.dll.a} </code></pre> <p><strong>Edit</strong></p> <p>I have the header file dh.h in usr/include/openssl </p> <p>And I have the required files (libssl32.dll, libeay32.dll and ssleay32.dll) in /usr/lib/</p> <p><strong>The answer</strong></p> <p>jHackTheRipper answered this and got the credit for it, but the final answer is buried in the comments beneath his answer. So to summarise, the waf mantra is</p> <pre><code>obj.lib='crypto' </code></pre>
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    1. COCan you show some code? What's the error coming back? Are you checking for `NetGroup.Neighbor.Connect` before sending as depicted in the [api](http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/net/NetGroup.html#sendToNeighbor())?
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