https://bugs.llvm.org/show_bug.cgi?id=44558
Bug ID: 44558
Summary: Nodiscard warning diagnosed twice when called in a
template:
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: erich.ke...@intel.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
https://godbolt.org/z/LesWP4
[[nodiscard]] int* bar();
template<typename T>
void foo() {
bar();
}
void baz() {
foo<int>();
}
<source>:7:5: warning: ignoring return value of function declared with
'nodiscard' attribute [-Wunused-result]
bar();
^~~
<source>:7:5: warning: ignoring return value of function declared with
'nodiscard' attribute [-Wunused-result]
bar();
^~~
<source>:11:5: note: in instantiation of function template specialization
'foo<int>' requested here
foo<int>();
The warning should likely only happen 1x, but we end up diagnosing it 2x. We
suppress 'errors' by marking the template invalid (and thus uncallable), but
don't do so with warnings.
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