[llvm-bugs] [Bug 41016] New: Warn when __atribute__((used)) is on definitions

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41016

            Bug ID: 41016
           Summary: Warn when __atribute__((used)) is on definitions
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: dave at znu.io
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

The following code generates the following suboptimal error with top-of-tree
clang:
```
template <typename T>
class Foo {
        void bar() __attribute__((used));
};

using FooInt = Foo<int>;

static FooInt f;

template <>
void FooInt::bar() { }
```

Generates:
```
/tmp/xxx.cpp:11:14: error: explicit specialization of 'bar' after instantiation
void FooInt::bar() { }
             ^
/tmp/xxx.cpp:8:15: note: implicit instantiation first required here
static FooInt f;
              ^
1 error generated.
```

Whereas the real underlying problem is that `__attribute__((used))` is on the
definition, not the declaration.

Please consider having a direct warning about the misplaced attribute. Thanks!

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