cconvey commented on code in PR #13267:
URL: https://github.com/apache/tvm/pull/13267#discussion_r1013385933
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src/tir/transforms/narrow_datatype.cc:
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@@ -187,6 +187,11 @@ class DataTypeVisitor final : public StmtExprVisitor {
arith::ConstIntBoundAnalyzer::BoundMapType bound_;
};
+#if __clang__
Review Comment:
Sorry, let me try making my point better with a slightly different example:
``` c++
#include <iostream>
#include <string>
using namespace std;
class BaseClass {
public:
virtual void foo(int x) {
cout << "BaseClass::foo(int): x = " << x << endl;
}
virtual void foo(string x) {
cout << "BaseClass::foo(string): x = " << x << endl;
}
};
class DerivedClass : public BaseClass {
public:
#ifdef OVERLOAD_FOO
virtual void foo(int x) {
cout << "DerivedClass::foo(int): x = " << x << endl;
}
#endif
};
int main() {
DerivedClass d;
d.foo("Hello, TVM!");
}
```
If I compile this with simply `clang++ -Woverloaded-virtual x.cpp`, the
compilation succeeds. When I run the resulting executable, it prints
`BaseClass::foo(string): x = Hello, TVM!`.
If I try to compile this with `clang++ -Woverloaded-virtual -DOVERLOAD_FOO
x.cpp`, I get this error:
```
x.cpp:27:11: error: cannot initialize a parameter of type 'int' with an
lvalue of type 'const char[12]'
d.foo("Hello, TVM!");
^~~~~~~~~~~~~
x.cpp:19:26: note: passing argument to parameter 'x' here
virtual void foo(int x) {
^
1 error generated.
```
The issue, as I understand it, is that because `DerviedClass` provides
_even one_ override of a base-class virtual function (`foo`), C++ will no
longer look at _any_ of the `BaseClass::foo(...)` overloads when it sees a call
such as `d.foo("Hello, TVM!")` in the example above.
Those base-class functions aren't _completely_ hidden. For example, if we
use `d.BaseClass("Hello, TVM!")` instead, the code compiles just fine.
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