[Bug libstdc++/108969] [13 Regression] Initializing iostreams in the library needs a GLIBCXX_3.4.31 versioned symbol

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108969

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
--- a/libstdc++-v3/src/c++98/globals_io.cc
+++ b/libstdc++-v3/src/c++98/globals_io.cc
@@ -43,6 +43,12 @@
 // In macro form:
 // _GLIBCXX_ASM_SYMVER(currentname, oldname, GLIBCXX_3.2)

+#if __has_attribute(symver) && !_GLIBCXX_INLINE_VERSION
+# define SYMVER(sym) __attribute__((symver(#sym "@@GLIBCXX_3.4.31")))
+#else
+# define SYMVER(sym)
+#endif
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -53,20 +59,20 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   __attribute__ ((aligned(__alignof__(istream))));
   typedef char fake_ostream[sizeof(ostream)]
   __attribute__ ((aligned(__alignof__(ostream))));
-  fake_istream cin;
-  fake_ostream cout;
-  fake_ostream cerr;
-  fake_ostream clog;
+  SYMVER(_ZSt3cin) fake_istream cin;
+  SYMVER(_ZSt4cout) fake_ostream cout;
+  SYMVER(_ZSt4cerr) fake_ostream cerr;
+  SYMVER(_ZSt4clog) fake_ostream clog;

 #ifdef _GLIBCXX_USE_WCHAR_T
   typedef char fake_wistream[sizeof(wistream)]
   __attribute__ ((aligned(__alignof__(wistream))));
   typedef char fake_wostream[sizeof(wostream)]
   __attribute__ ((aligned(__alignof__(wostream))));
-  fake_wistream wcin;
-  fake_wostream wcout;
-  fake_wostream wcerr;
-  fake_wostream wclog;
+  SYMVER(_ZSt4wcin) fake_wistream wcin;
+  SYMVER(_ZSt5wcout) fake_wostream wcout;
+  SYMVER(_ZSt5wcerr) fake_wostream wcerr;
+  SYMVER(_ZSt5wclog) fake_wostream wclog;
 #endif

 #include "ios_base_init.h"