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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - throw expression in noexcept coroutine erroneously triggers -Wexception"
href="https://bugs.llvm.org/show_bug.cgi?id=49453">49453</a>
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<th>Summary</th>
<td>throw expression in noexcept coroutine erroneously triggers -Wexception
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++2a
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>eniebler@boost.org
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>The entire body of a coroutine is implicitly wrapped in a try/catch, and
exceptions are (usually) marshaled as exception_ptrs into the promise to be
rethrown when the coroutine type is awaited in another coroutine.
So, what looks like an unhandled `throw` in a `noexcept` function is in fact
not in the case of coroutines.
For example:
unifex::task<int> bar() noexcept {
throw 42;
co_return 42;
}
warning: 'bar' has a non-throwing exception specification but can still throw
[-Wexceptions]
throw 42;
^
<source>:18:11: note: function declared non-throwing here
task<int> bar() noexcept {
^ ~~~~~~~~
1 warning generated.
See <a href="https://godbolt.org/z/Pj7qPW">https://godbolt.org/z/Pj7qPW</a>
I suggest that `-Wexception` be suppressed for all coroutines.</pre>
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