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POWhy does mglData cause a BAD ACCESS exception?
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  1. POWhy does mglData cause a BAD ACCESS exception?
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    copied!<p>I have successfully managed to install MathGL on Mac OS and managed to get the <code>mglGraph</code> to generate me the sample graphs. Yet when I try to use <code>mglData</code> to handle my data, it crashes with an "EXC_BAD_ACCESS" error. Why? Is there anything I need to do I haven't done?</p> <p>I installed mathgl with cmake, make and make install (using sudo to be on the safe side). Then I added the <em>/usr/local/include</em> and <em>/usr/local/lib</em> paths to the project and added the <em>libmgl.dylib</em> and <em>libmgl-wnd.dylib</em> references to the project. Is there anything I've missed out? I could not find anybody else with the error (well, I found many bad access errors, but none caused by mglData). The error pops up as soon as I'm trying to construct a mglData instance, so any of this triggers the exception:</p> <pre><code> mglData *data = new mglData(); mglData data; etc... </code></pre> <p><strong>EDIT</strong></p> <p>So, here's the bare bone of my code that compiles but crashes:</p> <pre><code> #include iostream #include mgl2/mgl.h int main(int argc, const char * argv[]) { mglData y; return 0; } </code></pre> <p>The thread's call stack when it crashes is:</p> <p><img src="https://i.stack.imgur.com/LWTV3.png" alt="Thread call stack"></p> <p>And the values of all variables are this:</p> <p><img src="https://i.stack.imgur.com/ESPC9.png" alt="Variable values"></p> <hr> <p><strong>Semi-Solved</strong> <em>Got it running</em></p> <p>After having been able to compile my project with g++, I tried changing the build settings and who would have believed it, I managed to get it running! All I did was change the <em>C++ Standard Library</em> to <code>libstdc++ (GNU C++ standard library)</code>. Now I'm not using the default, which is to use <code>libc++ (LLVM C++ standard library with C++ 11 support)</code>. At the moment this seems to work fine for my Cocoa application also, but I don't know for how long :P (When using more NS* Classes I worry LLVM may be necessary?)</p> <p>Still I'm very interested in how this issue can be resolved (without having to change the build settings) or whether it can't.</p>
 

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