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POCompiling with -fPIC and Swig error
 

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  1. POCompiling with -fPIC and Swig error
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    <p>I'm trying to add a Swig interface on top of some already existing c++ code and I'm coming up with some errors with the <code>-fPIC</code> flag.</p> <p>If I compile the already existing code without <code>-fPIC</code> and then create my Swig module using:</p> <pre><code>swig -python -c++ pyinterface.i gcc -fPIC $(CFLAGS)-I $(PYTHON_INCLUDE_DIR) -c pyinterface_wrap.cxx g++ -shared -o _pyinterface.so pyinterface_wrap.o -I $(PYTHON_INCLUDE_DIR) -L $(PYTHON_LIB_DIR) $(LPATH) $(LFLAGS) $(IPATH) $(LIBS) </code></pre> <p>Then I get a</p> <pre><code>warning: creating a DT_TEXTREL in object </code></pre> <p>However the module does seem to load and work in Python.</p> <p>If I compile the already existing code with <code>-fPIC</code> and then do the same to create my module, when I try and import it into python:</p> <pre><code>import pyinterface </code></pre> <p>Then I get the error </p> <pre><code>ImportError: ./_pyinterface.so: undefined symbol: _Z7InitErfPA20_d </code></pre> <p>I can't tell why this would be. However, in the compliation of the base c++ files that I am trying to wrap, they do link to some standard libraries such as <code>-llapack</code>.</p> <p>Could it be that I need to recompile these base libraries, like lapack, with <code>-fPIC</code>. That seems insane.</p> <p>EDIT:</p> <p>Actually sorry, I didn't realise, but with the -fPIC flag on I'm getting an error during compile: </p> <pre><code>g++: Internal error: Killed (program cc1plus) </code></pre> <p>Please submit a full bug report. See <a href="http://bugs.gentoo.org/" rel="nofollow">http://bugs.gentoo.org/</a> for instructions.</p> <p>I'll update this question if I figure out whats going on, but it seems like it might be unrelated to anything that the question actually raises. </p>
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    1. PTQuestion
    1. USthebigdog
    1. USthebigdog
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    1. COWhat architecture and OS are you using? My current best guess is that your _pyinterface module isn't actually linked against your C++ library, or there's a name mangling problem, i.e. you call C code from C++ but are missing `extern "C"` with the declarations.
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      1. POCompiling with -fPIC and Swig error
      1. USFlexo
    2. CO32 bit, linux. The base c++ code does call some C code (from lapack for instance) but that all works usually. You could be right about the linking, but then wouldn't both these methods fail?
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      1. POCompiling with -fPIC and Swig error
      1. USthebigdog
    3. COCan you make a minimal (e.g. 10 lines, single trivial inlined function) example that illustrates this? I'd have a play with it on my system and figure out what's going on, but I can't do more than guess from this right now.
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      1. POCompiling with -fPIC and Swig error
      1. USFlexo
 

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