<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/86849>86849</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Attributes on a function template definition (but not declaration) ignored if instantiation occurs before definition
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          dwblaikie
      </td>
    </tr>
</table>

<pre>
    Given:
```
void f();
template <bool>
#ifdef ATTR_DECL
__attribute__((noinline))
#endif
void f1();
int main() {
    f1<false>();
}
template <bool>
__attribute__((noinline)) void f1() { f(); }
```
https://godbolt.org/z/MG4qsxvj1
`f1` does not have the `noinline` attribute in the IR/from Clang's CodeGen - but if `ATTR_DECL` is defined or `main` is moved to after `f1`'s definition, the attribute is emitted.

GCC does have the same behavior, so one could argue this is intentional/consistent/correct - but seems a bit off? Curious to get some opinions at least


</pre>
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