When building selftests, mqueue and vDSO the following shows up:
warning: passing 'int *' to parameter of type 'unsigned int *' converts between pointers to integer types with different sign [-Wpointer-sign]
warning: passing 'const char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]
The code looked OK so what normally are done are, adding the compiler
directive to hide the warnings '-Wno-pointer-sign'.