g++ 4.01 -Wunreachable-code warns about code that is unreachable within a function, but does not warn about unused functions.
int foo() {
return 21; // point a
}
int bar() {
int a = 7;
return a;
a += 9; // point b
return a;
}
int main(int, char **) {
return bar();
}
g++ 4.01 will issue a warning about point b, but say nothing about foo() (point a) even though it is unreachable in this file. This behavior is correct although disappointing, because a compiler cannot know that function foo() is not declared extern in some other compilation unit and invoked from there; only a linker can be sure.
