https://devzone.nordicsemi.com/f/nordic-q-a/22956/difference-in-compiling-from-keil-or-makefileHello everyone, Currently we&#39;re writing a small program for the NRF52 (PCA10040), which has to communicate via SPI to an IMU (MPU-9250). The code is working correctly, because when my colleague compiles it using Keil everything is working as expecteden-USTelligent Community 13Thu, 22 Jun 2017 07:29:25 GMThttps://devzone.nordicsemi.com/thread/90314?ContentTypeID=1Thu, 22 Jun 2017 07:29:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0411674e-2724-4ce7-b3ec-bb1a08a6122bFormerMember<p><a href="https://devzone.nordicsemi.com/blogs/835/comparing-compilersides-for-development-with-nrf5x/">This</a> blog post compares Keil, IAR, and GCC. The blog post is a little old, but I would think it still gives an okay overall picture.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/90313?ContentTypeID=1Wed, 21 Jun 2017 21:41:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5a152824-e70f-4dad-b274-cbc5f341732eendnode<p>The fact that something compiles and links doesn&#39;t mean all is set correctly. Keil and GCC (Makefile) are using different start-up code and linker script mechanism (LD in GCC). Any specific difference when you compare MAP files generated during compilation? (all modules should be present in both, also sequence and sizes will differ)</p><div style="clear:both;"></div>