[gcc r14-10208] libstdc++: Guard dynamic_cast use in src/c++23/print.cc [PR115015]

[Jonathan Wakely]

https://gcc.gnu.org/g:eefa4c06483f95f5076687ed6aae5c6001731164

commit r14-10208-geefa4c06483f95f5076687ed6aae5c6001731164
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue May 14 14:32:23 2024 +0100

    libstdc++: Guard dynamic_cast use in src/c++23/print.cc [PR115015]
    
    Do not use dynamic_cast unconditionally, in case libstdc++ is built with
    -fno-rtti.
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/115015
            * src/c++23/print.cc (__open_terminal(streambuf*)) [!__cpp_rtti]:
            Do not use dynamic_cast.

Diff:
---
 libstdc++-v3/src/c++23/print.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/src/c++23/print.cc b/libstdc++-v3/src/c++23/print.cc
index aceca6f9139b..99a19cd45002 100644
--- a/libstdc++-v3/src/c++23/print.cc
+++ b/libstdc++-v3/src/c++23/print.cc
@@ -87,7 +87,7 @@ namespace
   void*
   __open_terminal(std::streambuf* sb)
   {
-#ifndef _GLIBCXX_USE_STDIO_PURE
+#if ! defined _GLIBCXX_USE_STDIO_PURE && defined __cpp_rtti
     using namespace __gnu_cxx;
 
     if (auto fb = dynamic_cast<stdio_sync_filebuf<char>*>(sb))