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#include <cstdint>
 
static uint16_t MAGIC_NUMBER_VAL = 7076;
 
#define convert_func(NUM) hexify(NUM)
#define hexify(NUM) 0x ## NUM
 
static const uint16_t val = convert_func(MAGIC_NUMBER_VAL); //0x7076
static const uint16_t val_tag = MAGIC_NUMBER_VAL;
 

prog.cpp:6:21: error: unable to find numeric literal operator ‘operator""xMAGIC_NUMBER_VAL’
 #define hexify(NUM) 0x ## NUM
                     ^~
prog.cpp:5:27: note: in expansion of macro ‘hexify’
 #define convert_func(NUM) hexify(NUM)
                           ^~~~~~
prog.cpp:8:29: note: in expansion of macro ‘convert_func’
 static const uint16_t val = convert_func(MAGIC_NUMBER_VAL); //0x7076
                             ^~~~~~~~~~~~

Standard output is empty