C preprocessors in GCC-AVR & AVR studio

Aug 22, 2004 3 Replies
T

Hi,



I am using GCC and AVR sudio in my MCU project. I find a big problem when the two tools are used together.



My C program has many "#ifdef"/"#endif" instruction segments to control different compilation options. However, when I debug the program in AVR studio and set watch points, some locations are misaligned so that the real position of instruction lines cannot be really located. I knew that becaue I found that some instruction lines cannot be set watchpoint successfully. So this brings a lot of troubles to me.



Could anyone teach me how to solve the problem? Or I need to remove those preprocesors?


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G

I'd be very, very surprised if the preprocessor stuff is causing problems.

Most likey, you need to turn off optimization in the compiler. With optimization enabled, lines get eliminated and re-arranged.

Grant Edwards grante Yow! Half a mind is a at terrible thing to waste! visi.com
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T

I think the problem i not in the optimization. For example, if A is not defined in the following, the alignment would become wrong in b() funciton. Setting or not setting optimization cannot help. : : #ifdef A void a() { : : } #endif : : void b() { :

}
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G

This might be an oversimplification of your problem, but you know that changing the source code after the last compilation can cause alignment problems for most source-level debuggers.

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