Re: How to get #define configuration in my MPLAB-X project for all ".c" files ?
You can define items one at a time by adding compiler options under the compiler settings of project options (In my example this is equivalent to #define I2CWOMBAT in every file):
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Some compilers (such as gcc) also allow you to create an entire .h file full of #defines and have it included as the first file in every file by adding it to the compiler command line with -include myfile.h but this doesn't seem to be supported with XC8. Not sure about XC16 or 32.