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#define UNKO_DISABLE
 
#if defined(UNKO_DISABLE)
namespace { template<int n> void unko_fun() {} }
#    define UNKO namespace { template<> void unko_fun<__LINE__>() {
#	define UNKO_TRAIL }};
#	define UNKO_IN_FUN if ( true ) ; else
#else
#	define UNKO
#	define UNKO_TRAIL
#	define UNKO_IN_FUN
#endif
 
 
///////////////////////////////////////////////////////////////////////////
 
 
UNKO int i = 0, j = 2;										UNKO_TRAIL
UNKO int k = 0, x = 2;										UNKO_TRAIL
 
int main()
{
	UNKO_IN_FUN int n = 0, m = 2;
 
	i, j, k, x;
	n, m;
}
 

prog.cpp: In function ‘void {anonymous}::unko_fun() [with int n = 19]’:
prog.cpp:19:10: warning: unused variable ‘i’ [-Wunused-variable]
prog.cpp:19:17: warning: unused variable ‘j’ [-Wunused-variable]
prog.cpp: In function ‘void {anonymous}::unko_fun() [with int n = 20]’:
prog.cpp:20:10: warning: unused variable ‘k’ [-Wunused-variable]
prog.cpp:20:17: warning: unused variable ‘x’ [-Wunused-variable]
prog.cpp: In function ‘int main()’:
prog.cpp:24:18: warning: unused variable ‘n’ [-Wunused-variable]
prog.cpp:24:25: warning: unused variable ‘m’ [-Wunused-variable]
prog.cpp:26:2: error: ‘i’ was not declared in this scope
prog.cpp:26:5: error: ‘j’ was not declared in this scope
prog.cpp:26:8: error: ‘k’ was not declared in this scope
prog.cpp:26:11: error: ‘x’ was not declared in this scope
prog.cpp:27:2: error: ‘n’ was not declared in this scope
prog.cpp:27:5: error: ‘m’ was not declared in this scope

Standard output is empty