| Issue |
123064
|
| Summary |
clang's -Wunreachable-code does not fire if the first unreachable line is a macro
|
| Labels |
clang:frontend
|
| Assignees |
|
| Reporter |
nico
|
This warns (as it should):
```
thakis@Mac src % cat notreach.cc
[[noreturn]] void notreached();
void g();
void f() {
notreached();
g();
}
% clang -c notreach.cc -Wunreachable-code
notreach.cc:6:3: warning: code will never be executed [-Wunreachable-code]
6 | g();
| ^
1 warning generated.
```
This doesn't:
```
% cat notreach2.cc
[[noreturn]] void notreached();
void g();
#define MY_MACRO(x) (void)(x)
void f() {
notreached();
MY_MACRO(5);
g();
}
% clang -c notreach2.cc -Wunreachable-code
# no output
```
Not emitting unreachable code warnings for the macro itself probably makes sense, but the diagnostic disappearing completely seems surprising.
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