commit 99bf3a817b9d31905dd12448e853ad2685635250
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Nov 9 10:09:51 2020

    libstdc++: Include <typeinfo> even for -fno-rtti [PR 97758]
    
    The std::function code now uses std::type_info* even when RTTI is
    disabled, so it should include <typeinfo> unconditionally. Without this,
    Clang can't compile <functional> with -fno-rtti (it works with GCC
    because std::type_info gets declared automatically by the compiler).
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/97758
            * include/bits/std_function.h [!__cpp_rtti]: Include <typeinfo>.

diff --git a/libstdc++-v3/include/bits/std_function.h b/libstdc++-v3/include/bits/std_function.h
index 054d9cbbf02b..1788b882a8aa 100644
--- a/libstdc++-v3/include/bits/std_function.h
+++ b/libstdc++-v3/include/bits/std_function.h
@@ -36,9 +36,7 @@
 # include <bits/c++0x_warning.h>
 #else
 
-#if __cpp_rtti
-# include <typeinfo>
-#endif
+#include <typeinfo>
 #include <bits/stl_function.h>
 #include <bits/invoke.h>
 #include <bits/refwrap.h>