We pass a const-reference to *this before it's constructed, and GCC
assumes that all const-references are accessed. Add the access attribute
to say it's not accessed.
libstdc++-v3/ChangeLog:
PR libstdc++/109339
* include/std/stop_token (_Stop_state_ptr(const stop_source&)):
Add attribute access with access-mode 'none'.
* testsuite/30_threads/stop_token/stop_source/109339.cc: New test.
{
_Stop_state_ref() = default;
+ [[__gnu__::__access__(__none__, 2)]]
explicit
_Stop_state_ref(const stop_source&)
: _M_ptr(new _Stop_state_t())
--- /dev/null
+// { dg-options "-Wmaybe-uninitialized -Og -std=gnu++20" }
+// { dg-do compile { target c++20 } }
+
+#include <stop_token>
+
+int main()
+{
+ std::stop_source ss;
+ // { dg-bogus "uninitialized" "PR 109339" { target *-*-* } 0 }
+}