I was able to automatically use the corrspondig headers by #ifdef in main.hpp and -D C_DEF in /bsl/XXX/bslConfig.cmake > not totally convinced <

CMakeLists.txt

@@ -30,6 +30,7 @@ set(INTERFACES_DIR ${CMAKE_SOURCE_DIR}/bsl/csl/interfaces)
 include(${PROJECT_DEFS})
 add_subdirectory(bsl)
 
+set(BSL_HEADER_FILE ${CMAKE_SOURCE_DIR}/bsl/raspberry/bsl_raspberry.hpp)
 
 message("${BoldBlue}Project Info  ${ColourReset}")
 message("${Blue} |--> Exec Name	\t: ${EXECUTABLE} ${ColourReset}")

bsl/nucleo_f042k6/bslConfig.cmake

@@ -40,6 +40,7 @@ set(C_FLAGS
 	$<$<CONFIG:Debug>:-O -g -gdwarf-2>)
 
 set(C_DEFS 
+	-DARM_MCU #Defined by kerem to auto configure headers in main.hpp
 	-DUSE_FULL_LL_DRIVER 
 	-DSTM32F042x6 
 	-DHSE_VALUE=8000000 

bsl/raspberry/bslConfig.cmake

@@ -17,7 +17,9 @@ set(C_FLAGS
 	-fdiagnostics-color=always
 	$<$<CONFIG:Debug>:-O -g -gdwarf-2>)
 
-set(C_DEFS -DSET_ALARM)
+set(C_DEFS 
+	-DRASPBERRY #Defined by kerem to auto configure headers in main.hpp
+	)
 
 set (CPP_INCLUDES ${CMAKE_SOURCE_DIR})
 set (CPP_FLAGS ${C_FLAGS})

main.cpp

@@ -1,8 +1,5 @@
 #include"main.hpp"
 
-#include "bsl/raspberry/bsl_raspberry.hpp"
-//#include "bsl/nucleo_f042k6/bsl_nucleo_f042k6.hpp"
-
 int main(int argc, char *argv[])
 {
 	startBSL(); 

main.hpp

@@ -1,4 +1,12 @@
 #ifndef MAIN_H
 #define MAIN_H
 
+#ifdef RASPBERRY
+	#include "bsl/raspberry/bsl_raspberry.hpp"
+#endif
+
+#ifdef ARM_MCU
+	#include "bsl/nucleo_f042k6/bsl_nucleo_f042k6.hpp"
+#endif
+
 #endif /* MAIN_H */