Keep -Wmaybe-uninitialized disabled

include/boost/function/function_template.hpp

@@ -906,6 +906,10 @@ namespace boost {
             // This warning is technically correct, but we don't want to pay the price for initializing
             // just to silence a warning: https://github.com/boostorg/function/issues/27
 #           pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#           if (BOOST_GCC >= 120000)
+              // GCC 12 emits a different warning: https://github.com/boostorg/function/issues/42
+#             pragma GCC diagnostic ignored "-Wuninitialized"
+#           endif
 #         endif
           std::memcpy(this->functor.data, f.functor.data, sizeof(boost::detail::function::function_buffer));
 #         if defined(BOOST_GCC) && (BOOST_GCC >= 40700)
@@ -1004,6 +1008,10 @@ namespace boost {
               // This warning is technically correct, but we don't want to pay the price for initializing
               // just to silence a warning: https://github.com/boostorg/function/issues/27
 #             pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#             if (BOOST_GCC >= 120000)
+                // GCC 12 emits a different warning: https://github.com/boostorg/function/issues/42
+#               pragma GCC diagnostic ignored "-Wuninitialized"
+#             endif
 #           endif
             std::memcpy(this->functor.data, f.functor.data, sizeof(this->functor.data));
 #           if defined(BOOST_GCC) && (BOOST_GCC >= 40700)

test/Jamfile.v2

@@ -82,3 +82,5 @@ run test_return_function.cpp return_function/<cxxstd>14 : : : <link>shared $(che
 run test_return_function.cpp return_function/<cxxstd>14 : : : <link>static $(check14) : return_function_static_14 ;
 
 run quick.cpp ;
+
+compile issue_42.cpp ;

test/issue_42.cpp

@@ -0,0 +1,21 @@
+// Copyright 2022 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+//
+// https://github.com/boostorg/function/issues/42
+
+#include <boost/function.hpp>
+
+struct F
+{
+    int operator()( int x ) const { return -x; }
+};
+
+struct X
+{
+    boost::function<int(int)> f_;
+    explicit X( boost::function<int(int)> f ): f_( f ) {}
+};
+
+F f2;
+X x( f2 ); // -Wuninitialized under GCC 12