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POg++ compile multiple files
 

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  1. POg++ compile multiple files
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    <p>I'got a problem with <strike>compiling</strike> linking of a program with multiple files by g++ (I usually use vstudio, but...).</p> <ol> <li><p>If I use only main.cpp (and include appropriate header files for openCV), everything is ok with</p> <pre><code>g++ main.cpp -o main -I"C:\OpenCV2.1\include\opencv" -L"C:\OpenCV2.1\lib" -lcxcore210 -lcv210 -lhighgui210 </code></pre></li> <li><p>If I have main.cpp and some otherfile.cpp (both need openCV) and use</p> <pre><code>g++ main.cpp otherfile.cpp -o main -I"C:\OpenCV2.1\include\opencv" -L"C:\OpenCV2.1\lib" -lcxcore210 -lcv210 -lhighgui210 </code></pre> <p>it simply doesn't work and I got</p> <pre><code>c:/mingw/bin/../lib/gcc/mingw32/4.5.0/../../../../mingw32/bin/ld.exe: warning: a uto-importing has been activated without --enable-auto-import specified on the c ommand line. This should work unless it involves constant data structures referencing symbols from auto-imported DLLs. C:\Users\ONDEJM~1\AppData\Local\Temp\ccNisCoC.o:main.cpp:(.text+0x16d0): undefin ed reference to `cv::Mat::Mat(_IplImage const*, bool)' C:\Users\ONDEJM~1\AppData\Local\Temp\ccNisCoC.o:main.cpp:(.text+0x16f1): undefin ed reference to `cv::FAST(cv::Mat const&amp;, std::vector&lt;cv::KeyPoint, std::allocat or&lt;cv::KeyPoint&gt; &gt;&amp;, int, bool)' C:\Users\ONDEJM~1\AppData\Local\Temp\ccNisCoC.o:main.cpp:(.text$_ZN2cv3Mat7relea seEv[cv::Mat::release()]+0x3f): undefined reference to `cv::fastFree(void*)' collect2: ld returned 1 exit status </code></pre></li> </ol> <p>What am I doing wrong?</p>
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    1. COThis is a linking problem rather than a compilation problem. Have you tried compiling main.cpp and otherfile.cpp separately then linking the resulting .o files together? Does this affect the error at all?
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    2. COyes, I tried. Compiling of both files separately is not a problem, however, building them together returns the same error
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    3. COSee the related http://stackoverflow.com/questions/1095298/gcc-c-linker-errors-undefined-reference-to-vtable-for-xxx-undefined-referen/1095321#1095321 for more info on this
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