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POmingw ignores '-L' flag
 

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  1. POmingw ignores '-L' flag
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    <p>I am getting linker failures under <code>MinGW</code>, however I cannot see why. This is the link command:</p> <blockquote> <p>g++ -shared -mthreads -Wl,--out-implib,C:\Users\camm\Syren\libs\libSy_polyMesh.a -o C:\Users\camm\Syren\libs\Sy_polyMesh.dll debug/Sy_polyMesh.o debug/moc_Sy_polyMesh.o debug/qrc_Sy_polyMesh.o -L"c:\Qt\4.8.4\lib" -lglu32 -lopengl32 -lgdi32 -luser32 -LC:\Users\camm\Syren/libs -lSyren -lglew32 -lboost_system -lQtSvgd4 -lQtSqld4 -lQtOpenGLd4 -lQtGuid4 -lQtCored4</p> </blockquote> <p>The <code>undefined reference</code> errors come from the <code>Syren</code> dll (I should state the command was automatically generated by <code>qmake</code>). The <code>-LC:\Users\camm\Syren/libs</code> looks malformed to me because of the mix of forward and backslashes, but if I manually set them to all one way or the other - it does not change the compiler output.</p> <p>I had earlier problems with 3rd party libraries I needed (GLEW and Boost specifically), but because they were relatively 'constant' I didn't have a problem putting them in my <code>C:\MinGW\lib</code> directory. But that is really not an option for my plugins.</p> <p>What I find is that the MinGW <a href="http://www.mingw.org/wiki/HOWTO_Specify_the_Location_of_External_Libraries_for_use_with_MinGW" rel="nofollow">docs</a> state in a few locations:</p> <blockquote> <p>...since suitable search paths may always be specified using -L options.</p> <p>...but that GCC itself furnishes the effective defaults, by supplying appropriate -L options.</p> </blockquote> <p>However, <code>C:\Users\camm\Syren\libs</code> is where <code>Syren.dll</code> resides!</p> <p><strong>Edit:</strong> Here are the LIBS declarations in my <code>.pro</code> file:</p> <pre><code>LIBS += -L$(SYREN_PATH)/libs \ -lSyren win32 { LIBS += -lglew32 \ -lboost_system } </code></pre> <p>And <code>$(SYREN_PATH)</code> expands to <code>C:\Users\camm\Syren</code>. Also I can see to the 'missing' symbols in <code>Syren.dll</code>, for example:</p> <blockquote> <p>C:\Users\camm\Documents\Syren\Sy_polyMesh_debug/../Sy_polyMesh/src/Sy_polyMesh.cpp:341: undefined reference to `Sy_GLBuffer::unbind()'</p> </blockquote> <p>Can be seen listed as:</p> <blockquote> <p>6c500bd6 T _ZN11Sy_GLBuffer6unbindEv</p> </blockquote> <p><strong>Edit2</strong></p> <p>After adding a verbose flag to the linker stage I noticed that the linker was iterating through each search path and then through each library naming convention, and using the first one it could open.</p> <pre><code>attempt to open C:\Users\camm\Syren/libs/libSyren.dll.a failed attempt to open C:\Users\camm\Syren/libs/Syren.dll.a failed attempt to open C:\Users\camm\Syren/libs/libSyren.a succeeded </code></pre> <p>Hypothesizing that the <code>libSyren.a</code> may be broken, I renamed it to force the linker to use the <code>.dll</code>:</p> <pre><code>attempt to open C:\Users\camm\Syren/libs/libSyren.dll.a failed attempt to open C:\Users\camm\Syren/libs/Syren.dll.a failed attempt to open C:\Users\camm\Syren/libs/libSyren.a failed attempt to open C:\Users\camm\Syren/libs/Syren.lib failed attempt to open C:\Users\camm\Syren/libs/libSyren.dll failed attempt to open C:\Users\camm\Syren/libs/Syren.dll succeeded </code></pre> <p>But I still get exactly the same error messages!</p>
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    1. COWhich build system are you using? The compiler itself should understand both, but the shell and make don't.
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      1. USJan Hudec
    2. COcan you post your "LIBS" declarations inside the project file??
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    3. CO@UmNyobe Added.
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