Index: libcxx/include/string
===================================================================
--- libcxx/include/string
+++ libcxx/include/string
@@ -4537,6 +4537,7 @@
 _LIBCPP_FUNC_VIS double      stod (const string& __str, size_t* __idx = nullptr);
 _LIBCPP_FUNC_VIS long double stold(const string& __str, size_t* __idx = nullptr);
 
+#if _LIBCPP_DEBUG_LEVEL != 2 || !defined(_LIBCPP_ALWAYS_INLINE)
 _LIBCPP_FUNC_VIS string to_string(int __val);
 _LIBCPP_FUNC_VIS string to_string(unsigned __val);
 _LIBCPP_FUNC_VIS string to_string(long __val);
@@ -4546,6 +4547,55 @@
 _LIBCPP_FUNC_VIS string to_string(float __val);
 _LIBCPP_FUNC_VIS string to_string(double __val);
 _LIBCPP_FUNC_VIS string to_string(long double __val);
+#else
+// HACK: These crash in debug mode and cannot be changed without changing ABI.
+// Keep only the ones with the largest types and wrap the rest to fix the problem.
+_LIBCPP_FUNC_VIS string to_string(long long __val);
+_LIBCPP_FUNC_VIS string to_string(unsigned long long __val);
+_LIBCPP_FUNC_VIS string to_string(long double __val);
+
+static _LIBCPP_ALWAYS_INLINE string to_string(int __val)
+{
+    string __s = to_string(static_cast<long long>(__val));
+    std::__debug_db_insert_c(&__s);
+    return __s;
+}
+
+static _LIBCPP_ALWAYS_INLINE string to_string(unsigned __val)
+{
+    string __s = to_string(static_cast<unsigned long long>(__val));
+    std::__debug_db_insert_c(&__s);
+    return __s;
+}
+
+static _LIBCPP_ALWAYS_INLINE string to_string(long __val)
+{
+    string __s = to_string(static_cast<long long>(__val));
+    std::__debug_db_insert_c(&__s);
+    return __s;
+}
+
+static _LIBCPP_ALWAYS_INLINE string to_string(unsigned long __val)
+{
+    string __s = to_string(static_cast<unsigned long long>(__val));
+    std::__debug_db_insert_c(&__s);
+    return __s;
+}
+
+static _LIBCPP_ALWAYS_INLINE string to_string(float __val)
+{
+    string __s = to_string(static_cast<long double>(__val));
+    std::__debug_db_insert_c(&__s);
+    return __s;
+}
+
+static _LIBCPP_ALWAYS_INLINE string to_string(double __val)
+{
+    string __s = to_string(static_cast<long double>(__val));
+    std::__debug_db_insert_c(&__s);
+    return __s;
+}
+#endif
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 _LIBCPP_FUNC_VIS int                stoi  (const wstring& __str, size_t* __idx = nullptr, int __base = 10);
@@ -4558,6 +4608,7 @@
 _LIBCPP_FUNC_VIS double      stod (const wstring& __str, size_t* __idx = nullptr);
 _LIBCPP_FUNC_VIS long double stold(const wstring& __str, size_t* __idx = nullptr);
 
+#if _LIBCPP_DEBUG_LEVEL != 2 || !defined(_LIBCPP_ALWAYS_INLINE)
 _LIBCPP_FUNC_VIS wstring to_wstring(int __val);
 _LIBCPP_FUNC_VIS wstring to_wstring(unsigned __val);
 _LIBCPP_FUNC_VIS wstring to_wstring(long __val);
@@ -4567,6 +4618,55 @@
 _LIBCPP_FUNC_VIS wstring to_wstring(float __val);
 _LIBCPP_FUNC_VIS wstring to_wstring(double __val);
 _LIBCPP_FUNC_VIS wstring to_wstring(long double __val);
+#else
+// HACK: These crash in debug mode and cannot be changed without changing ABI.
+// Keep only the ones with the largest types and wrap the rest to fix the problem.
+_LIBCPP_FUNC_VIS wstring to_wstring(long long __val);
+_LIBCPP_FUNC_VIS wstring to_wstring(unsigned long long __val);
+_LIBCPP_FUNC_VIS wstring to_wstring(long double __val);
+
+static _LIBCPP_ALWAYS_INLINE wstring to_wstring(int __val)
+{
+    wstring __s = to_wstring(static_cast<long long>(__val));
+    std::__debug_db_insert_c(&__s);
+    return __s;
+}
+
+static _LIBCPP_ALWAYS_INLINE wstring to_wstring(unsigned __val)
+{
+    wstring __s = to_wstring(static_cast<unsigned long long>(__val));
+    std::__debug_db_insert_c(&__s);
+    return __s;
+}
+
+static _LIBCPP_ALWAYS_INLINE wstring to_wstring(long __val)
+{
+    wstring __s = to_wstring(static_cast<long long>(__val));
+    std::__debug_db_insert_c(&__s);
+    return __s;
+}
+
+static _LIBCPP_ALWAYS_INLINE wstring to_wstring(unsigned long __val)
+{
+    wstring __s = to_wstring(static_cast<unsigned long long>(__val));
+    std::__debug_db_insert_c(&__s);
+    return __s;
+}
+
+static _LIBCPP_ALWAYS_INLINE wstring to_wstring(float __val)
+{
+    wstring __s = to_wstring(static_cast<long double>(__val));
+    std::__debug_db_insert_c(&__s);
+    return __s;
+}
+
+static _LIBCPP_ALWAYS_INLINE wstring to_wstring(double __val)
+{
+    wstring __s = to_wstring(static_cast<long double>(__val));
+    std::__debug_db_insert_c(&__s);
+    return __s;
+}
+#endif
 #endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
 
 template<class _CharT, class _Traits, class _Allocator>