How to fix Keil EFM8 ERROR C267 'SLAB_ASSERT': requires ANSI-style prototype

Problem:

You want to compile your EFM8 application but you see these error messages:

*** WARNING C206 IN LINE 86 OF C:\SiliconLabs\SimplicityStudio\v4\developer\sdks\8051\v4.1.7\Device\EFM8BB3\peripheral_driver\src\adc_0.c: 'SLAB_ASSERT': missing function-prototype
*** ERROR C267 IN LINE 86 OF C:\SiliconLabs\SimplicityStudio\v4\developer\sdks\8051\v4.1.7\Device\EFM8BB3\peripheral_driver\src\adc_0.c: 'SLAB_ASSERT': requires ANSI-style prototype

Solution

Go into your Project properties (by right-clicking on your project on the top left and clicking “Properties”)-> C/C++ Build -> Project Modules

There, select 8051 -> EFM8 and check the Assert checkbox to include the assertion module. Now recompile your module.