[Bug target/57631] spurious warning for avr interrupts with asm labels

[pebbles at riseup dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57631

--- Comment #1 from pebbles at riseup dot net ---
Here is a more complete test:

// test.c ...
__attribute__((signal,used))
void __vector_1() { asm(""); } // should not trigger warning, should be placed
in __vectors

__attribute__((signal,used))
void pretendName() asm("__vector_2");
void pretendName() { asm(""); } // should not trigger warning, should be placed
in __vectors 

__attribute__((signal,used))
void __victor_3() { asm(""); } // should trigger warning, not be placed in
__vectors

__attribute__((signal,used))
void __vector_4() asm("__victor_4");
void __vector_4() { asm(""); } // should trigger warning, not be placed in
__vectors

int main() { return 0; }
// ... test.c

Really, I feel this should either be a disableable warning (if users are
expected to create interrupts and signals that will not be placed in the IV) or
an error.