Eclipse IDE (ONSemi) math function reference error

Question

I'm using the Eclipse based ONSemi IDE for my RSL10 device.

I would class myself as a novice when it comes to using Eclipse IDE and the GNU / C compiler.

So this has me puzzled.

I've included math.h and it registers when I include the math function I want to use - in this case log10.

However, when I choose to build my project, I get an error "undefined reference to `log10'"

I'm sure it is something obvious.

Any idea?

BigG · Answer

Thanks for the all the very useful replies. Yes, I had read online elsewhere that it might be related to linker but was not sure why, so very pleased to hear the same viewpoint. So after a bit of searching around I found the place for the "-lm" to be applied... and it works! Brilliant. Thanks so much for the help.

skywalker1211 · Answer

probably math lib is not included in linker. -lm flag

Jan Cumps · Answer

Good news! This setting is configuration dependent. Setting it for the active debug config does not automatically set it for the release config.If you plan to build a release version, it’s handy to keep the settings in sync. If that’s not the plan, you can ignore it.

genebren · Answer

Have you instructed the linker to include the math library (linker options - Libraries)?

Jan Cumps · Answer

With Eclipse there are occurances where the editor knows where the header file is , but the compiler not. This may be one of those ...

Eclipse IDE (ONSemi) math function reference error

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