cores/arduino/wiring_constants.h

@@ -56,25 +56,23 @@ enum BitOrder
 #define NOT_AN_INTERRUPT -1
 
 // Math
-#ifdef __cplusplus
-  #include <algorithm>
-  using std::min;
-  using std::max;
-#else // C
-  #include <stdlib.h>
-  #ifndef abs
-    #define abs(x) ((x)>0?(x):-(x))
-  #endif // abs
+#include <stdlib.h>
+// undefine stdlib's abs if encountered
+#ifdef abs
+#undef abs
+#endif
+#ifndef abs
+  #define abs(x) ((x)>0?(x):-(x))
+#endif // abs
 
-  #ifndef min
-    #define min(a,b) ((a)<(b)?(a):(b))
-  #endif // min
+#ifndef min
+  #define min(a,b) ((a)<(b)?(a):(b))
+#endif // min
 
-  #ifndef max
-    #define max(a,b) ((a)>(b)?(a):(b))
-  #endif // max
+#ifndef max
+  #define max(a,b) ((a)>(b)?(a):(b))
+#endif // max
 
-#endif // __cplusplus
 #define constrain(amt,low,high) ((amt)<(low)?(low):((amt)>(high)?(high):(amt)))
 #define radians(deg)  ((deg)*DEG_TO_RAD)
 #define degrees(rad)  ((rad)*RAD_TO_DEG)

libraries/EEPROM/src/EEPROM.h

@@ -94,7 +94,7 @@ struct EEPROMClass{
     uint16_t length()                    { return (uint16_t)EEPROM_LENGHT; }
     
     template< typename T >
-    T &put(int idx, T &data)
+    const T &put(int idx, const T &data)
     {
         void* dataPointer = (void*)&data;
         // check if idx is valid

platform.txt

@@ -34,8 +34,8 @@ compiler.optimization_flags.debug=-Og -g3
 
 compiler.extra_flags = -march=rv32imc_zicsr_zifencei -mabi=ilp32 -mcmodel=medlow -Wall -fsigned-char -ffunction-sections
 compiler.S.flags     = {compiler.extra_flags} -x assembler-with-cpp {compiler.define} -I"{runtime.platform.path}/libraries/FreeRTOS/src" {compiler.optimization_flags} {compiler.warning_flags} {compiler.MIK32_Amur.extra_include}
-compiler.c.flags     = -c -std=gnu11 {compiler.extra_flags} {compiler.define} {compiler.warning_flags} {compiler.optimization_flags} {compiler.MIK32_Amur.extra_include}
-compiler.cpp.flags   = -c -std=gnu++17 -fabi-version=0 -fno-exceptions -fno-rtti -fno-use-cxa-atexit -fno-threadsafe-statics {compiler.extra_flags} {compiler.define} {compiler.warning_flags} {compiler.optimization_flags} {compiler.MIK32_Amur.extra_include}
+compiler.c.flags     = -c -std=gnu11 -Werror=return-type {compiler.extra_flags} {compiler.define} {compiler.warning_flags} {compiler.optimization_flags} {compiler.MIK32_Amur.extra_include}
+compiler.cpp.flags   = -c -std=gnu++17 -fabi-version=0 -fno-exceptions -fno-rtti -fno-use-cxa-atexit -fno-threadsafe-statics -Werror=return-type {compiler.extra_flags} {compiler.define} {compiler.warning_flags} {compiler.optimization_flags} {compiler.MIK32_Amur.extra_include}
 compiler.c.elf.flags = -march=rv32imc_zicsr_zifencei -mabi=ilp32 -mcmodel=medlow -nostartfiles -Xlinker
 compiler.ar.flags=rc
 compiler.elf2bin.flags=-O binary