(XC32) How do I link in my own custom startup code with the XC32 Compiler?

These are the steps to link the customized startup code in XC32:


Copy the default startup code crt0.S, available under the folder <Compiler-DIR>\pic32-libs\libpic32\startup, to your project directory.


Customize this startup code by making the changes as required.


Add this modified startup code (crt0.S) to the MPLAB® X IDE project under Source Files.

You may also change the name of your custom startup code to something like my_startup.S.


Set the options to exclude linking of default startup code.

In MPLAB X IDE, go to File > Project Properties > xc32-ld. Select Libraries for Option categories. Check the Do not link startup code option. Click Ok.


The code will now link with the customized startup code.

Note that the default startup code source, crt0.S, uses many device-specific macros that should be defined as appropriate for your target device.

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