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Contains ad hoc patches for cross building.

From c826142dda98398551e0df2f956e0995688595d8 Mon Sep 17 00:00:00 2001
From: MXE
Date: Sat, 4 Jul 2015 02:59:03 +0300
Subject: [PATCH] fixes codecvt_byname exports for Mingw,
 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66030


diff --git a/libstdc++-v3/config/abi/pre/gnu.ver b/libstdc++-v3/config/abi/pre/gnu.ver
index 7b82ce8..120b133 100644
--- a/libstdc++-v3/config/abi/pre/gnu.ver
+++ b/libstdc++-v3/config/abi/pre/gnu.ver
@@ -543,6 +543,9 @@ GLIBCXX_3.4 {
     # std::codecvt_byname
     _ZNSt14codecvt_bynameI[cw]c11__mbstate_tEC[12]EPKc[jmy];
     _ZNSt14codecvt_bynameI[cw]c11__mbstate_tED*;
+#if defined (_WIN32) && !defined (__CYGWIN__)
+    _ZNSt14codecvt_bynameI[cw]ciE[CD]*;
+#endif
 
     # std::collate
     _ZNSt7collateI[cw]*;
@@ -1819,9 +1822,9 @@ GLIBCXX_3.4.21 {
     _ZNKSt8time_getI[cw]St19istreambuf_iteratorI[cw]St11char_traitsI[cw]EEE6do_getES3_S3_RSt8ios_baseRSt12_Ios_IostateP2tmcc;
 
     # codecvt<char16_t, char, mbstate_t>, codecvt<char32_t, char, mbstate_t>
-    _ZNKSt7codecvtID[is]c11__mbstate_t*;
-    _ZNSt7codecvtID[is]c11__mbstate_t*;
-    _ZT[ISV]St7codecvtID[is]c11__mbstate_tE;
+    _ZNKSt7codecvtID[is]c*;
+    _ZNSt7codecvtID[is]c*;
+    _ZT[ISV]St7codecvtID[is]c*E;
 
     extern "C++"
     {
-- 
1.9.1