Description:
System header sys/sysmacros.h defines a couple of macros,
namely 'minor' and 'macro', in lower-case form. So in these
two words are available in a source code to be used
as function name (or class member name in C++).

This is a glibc issue, so we should probably file a bug to them.

Steps to reproduce:
$ cat test.c
#include "stdlib.h"

void minor(int a, int b) {};

int main(void) { return EXIT_SUCCESS; }

$ gcc -fsyntax-only test.c
test.c:3:24: error: macro "minor" passed 2 arguments, but takes just 1
test.c:3:26: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘{’ token

In this case, sysmacros.h is implicitely included by stdlib.h, that
defines EXIT_SUCCESS. A dirty workaround would be a '#undef minor'.