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Troubleshooting

Turn off compiler optimization until your program is working. This makes compiling faster, debugging easier, and, besides, the optimizer may be broken and the cause of some problems. (Don't automatically blame the optimizer, however, if your program fails when it is turned on. Optimized code uses the stack and registers differently than unoptimized code in such a way that may expose or mask a bug in your code. For example, the common mistake of returning a pointer to a local variable may or may not cause a problem depending on stack and register use.)

Check the return values from the MathLink library functions or call MLError() at key points in your program. MathLink will often be able to tell you what has gone wrong.

The files "mathlink.h" and "libML.a" are a matched set. If you have used an earlier release of MathLink, you should take care that you don't mix components when building your application.

Check whether the C compiler you are using supports prototypes. If it does not, you will need to change your code and the way you build your project. This is explained in the section Building MathLink Programs.