C Macro definition to determine big endian or little endian machine?

Is there a one line macro definition to determine the endianness of the machine. I am using the following code but converting it to macro would be too long. unsigned char test_endian( void ) { int test_var = 1; unsigned char *test_endian = (unsigned char*)&test_var; return (test_endian[0] == 0); }
Why not include the same code into a macro?

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