fix: add size optimization

This flag is also present in the Makefile and optimises the resulting binary for the size of the binary. Without that flag the flash consumption would be too high to fit inside the allocated space.

Signed-off-by: Andreas Kurz <info@akurz.net>

CMakeLists.txt

@@ -170,6 +170,7 @@ target_compile_options(bootloader PUBLIC
   -Wmissing-format-attribute
   -Wno-endif-labels
   -Wunreachable-code
+  -Os
   # Suppress warning caused by SDK
   -Wno-unused-parameter -Wno-expansion-to-defined -Wno-array-bounds
   )
@@ -333,4 +334,4 @@ add_custom_target(flash-mbr
 
 add_custom_target(flash-erase
   COMMAND ${NRFJPROG} -f nrf52 --eraseall
-  )
+  )