Including <functional> and enabling CppUTest breaks compile on GCC 15.2 #1898

cmake_minimum_required (VERSION 3.14)

set(CMAKE_CXX_STANDARD 23)
set(CMAKE_C_STANDARD   17)

set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
set(CMAKE_BUILD_TYPE Debug)

include(FetchContent)
FetchContent_Declare(cpputest
  GIT_REPOSITORY  https://github.com/cpputest/cpputest.git
  GIT_TAG         master
)
FetchContent_MakeAvailable(CppUTest)

project(cpputest_functional_bug LANGUAGES C CXX)

enable_testing()

add_executable(test_functional test_functional.cpp)
target_link_libraries(test_functional PRIVATE CppUTest::CppUTest)
add_test(test_functional test_functional)

#include <functional>
int main()
{
    return 0;
}

[1/2] Building CXX object CMakeFiles/test_functional.dir/test_functional.cpp.o
FAILED: [code=1] CMakeFiles/test_functional.dir/test_functional.cpp.o
/usr/bin/c++ -DCPPUTEST_HAVE_FORK -DCPPUTEST_HAVE_KILL -DCPPUTEST_HAVE_PTHREAD_MUTEX_LOCK -DCPPUTEST_HAVE_STRDUP -DCPPUTEST_HAVE_WAITPID -DCPPUTEST_USE_LONG_LONG=1 -DCPPUTEST_USE_MEM_LEAK_DETECTION=1 -DCPPUTEST_USE_STD_CPP_LIB=1 -DCPPUTEST_USE_STD_C_LIB=1 -I/home/tims/Projects/cpputest_functional_bug/build/_deps/cpputest-src/include -I/home/tims/Projects/cpputest_functional_bug/build/_deps/cpputest-build -g -std=gnu++23 -includeCppUTest/MemoryLeakDetectorForceInclude.h -MD -MT CMakeFiles/test_functional.dir/test_functional.cpp.o -MF CMakeFiles/test_functional.dir/test_functional.cpp.o.d -o CMakeFiles/test_functional.dir/test_functional.cpp.o -c /home/tims/Projects/cpputest_functional_bug/test_functional.cpp
In file included from /usr/include/c++/15/functional:61,
                 from /home/tims/Projects/cpputest_functional_bug/test_functional.cpp:1:
/usr/include/c++/15/bits/std_function.h: In static member function ‘static void std::_Function_base::_Base_manager<_Functor>::_M_create(std::_Any_data&, _Fn&&, std::true_type)’:
/usr/include/c++/15/bits/std_function.h:154:20: error: ‘__dest’ does not name a type; did you mean ‘__dev_t’? [-Wtemplate-body]
  154 |             ::new (__dest._M_access()) _Functor(std::forward<_Fn>(__f));
      |                    ^~~~~~
      |                    __dev_t
/usr/include/c++/15/bits/std_function.h:154:26: error: expected ‘)’ before ‘.’ token [-Wtemplate-body]
  154 |             ::new (__dest._M_access()) _Functor(std::forward<_Fn>(__f));
      |                          ^
/usr/include/c++/15/bits/std_function.h:154:19: note: to match this ‘(’
  154 |             ::new (__dest._M_access()) _Functor(std::forward<_Fn>(__f));
      |                   ^
In file included from /usr/include/c++/15/bits/hashtable.h:37,
                 from /usr/include/c++/15/bits/unordered_map.h:33,
                 from /usr/include/c++/15/unordered_map:43,
                 from /usr/include/c++/15/functional:65:
/usr/include/c++/15/bits/hashtable_policy.h: In member function ‘std::__detail::_Hashtable_alloc<_NodeAlloc>::__node_type* std::__detail::_Hashtable_alloc<_NodeAlloc>::_M_allocate_node(_Args&& ...)’:
/usr/include/c++/15/bits/hashtable_policy.h:1555:20: error: expected type-specifier before ‘(’ token [-Wtemplate-body]
 1555 |             ::new ((void*)__n) __node_type;
      |                    ^
/usr/include/c++/15/bits/hashtable_policy.h:1555:20: error: expected ‘)’ before ‘(’ token [-Wtemplate-body]
 1555 |             ::new ((void*)__n) __node_type;
      |                   ~^
      |                    )
/usr/include/c++/15/bits/hashtable_policy.h:1555:21: error: expected primary-expression before ‘void’ [-Wtemplate-body]
 1555 |             ::new ((void*)__n) __node_type;
      |                     ^~~~
In file included from /usr/include/c++/15/bits/hashtable.h:42:
/usr/include/c++/15/bits/node_handle.h: In member function ‘void std::_Node_handle_common<_Val, _NodeAlloc>::_M_move(std::_Node_handle_common<_Val, _NodeAlloc>&&)’:
/usr/include/c++/15/bits/node_handle.h:157:16: error: expected type-specifier [-Wtemplate-body]
  157 |         ::new (std::__addressof(_M_alloc)) _NodeAlloc(__nh._M_alloc.release());
      |                ^~~
/usr/include/c++/15/bits/node_handle.h:157:16: error: expected ‘)’ [-Wtemplate-body]
/usr/include/c++/15/bits/node_handle.h:157:15: note: to match this ‘(’
  157 |         ::new (std::__addressof(_M_alloc)) _NodeAlloc(__nh._M_alloc.release());
      |               ^
In file included from /usr/include/c++/15/functional:76:
/usr/include/c++/15/bits/move_only_function.h: In member function ‘void std::_Mofunc_base::_M_init(_Args&& ...)’:
/usr/include/c++/15/bits/move_only_function.h:79:18: error: ‘_M_storage’ does not name a type; did you mean ‘_Storage’? [-Wtemplate-body]
   79 |           ::new (_M_storage._M_addr()) _Tp(std::forward<_Args>(__args)...);
      |                  ^~~~~~~~~~
      |                  _Storage
/usr/include/c++/15/bits/move_only_function.h:79:28: error: expected ‘)’ before ‘.’ token [-Wtemplate-body]
   79 |           ::new (_M_storage._M_addr()) _Tp(std::forward<_Args>(__args)...);
      |                            ^
/usr/include/c++/15/bits/move_only_function.h:79:17: note: to match this ‘(’
   79 |           ::new (_M_storage._M_addr()) _Tp(std::forward<_Args>(__args)...);
      |                 ^
/usr/include/c++/15/bits/move_only_function.h: In static member function ‘static void std::_Mofunc_base::_S_manage(_Storage&, _Storage*)’:
/usr/include/c++/15/bits/move_only_function.h:163:24: error: ‘__target’ does not name a type; did you mean ‘__pair_get’? [-Wtemplate-body]
  163 |                 ::new (__target._M_addr()) _Tp(std::move(*__rval));
      |                        ^~~~~~~~
      |                        __pair_get
/usr/include/c++/15/bits/move_only_function.h:163:32: error: expected ‘)’ before ‘.’ token [-Wtemplate-body]
  163 |                 ::new (__target._M_addr()) _Tp(std::move(*__rval));
      |                                ^
/usr/include/c++/15/bits/move_only_function.h:163:23: note: to match this ‘(’
  163 |                 ::new (__target._M_addr()) _Tp(std::move(*__rval));
      |                       ^
ninja: build stopped: subcommand failed.