3 files changed, 13 insertions, 0 deletions
diff --git a/libstdc++-v3/include/Makefile.am b/libstdc++-v3/include/Makefile.am
index 7cf0ef93eb4..70a662fa2f9 100644
--- a/libstdc++-v3/include/Makefile.am
+++ b/libstdc++-v3/include/Makefile.am
@@ -1479,3 +1479,8 @@ $(decimal_headers): ; @:
 $(ext_headers): ; @:
 $(experimental_headers): ; @:
 $(experimental_bits_headers): ; @:
+
+if INCLUDE_DIR_NOTPARALLEL
+# See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81797
+.NOTPARALLEL:
+endif
diff --git a/libstdc++-v3/include/Makefile.in b/libstdc++-v3/include/Makefile.in
index 068ffd018f1..790887a259c 100644
--- a/libstdc++-v3/include/Makefile.in
+++ b/libstdc++-v3/include/Makefile.in
@@ -1903,6 +1903,9 @@ $(ext_headers): ; @:
 $(experimental_headers): ; @:
 $(experimental_bits_headers): ; @:
 
+# See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81797
+@INCLUDE_DIR_NOTPARALLEL_TRUE@.NOTPARALLEL:
+
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.
 .NOEXPORT:
diff --git a/libstdc++-v3/include/ext/aligned_buffer.h b/libstdc++-v3/include/ext/aligned_buffer.h
index 94a2ff0e67a..81fb797723c 100644
--- a/libstdc++-v3/include/ext/aligned_buffer.h
+++ b/libstdc++-v3/include/ext/aligned_buffer.h
@@ -75,6 +75,10 @@ namespace __gnu_cxx
       { return static_cast<const _Tp*>(_M_addr()); }
     };
 
+#if _GLIBCXX_INLINE_VERSION
+  template<typename _Tp>
+    using __aligned_buffer = __aligned_membuf<_Tp>;
+#else
   // Similar to __aligned_membuf but aligned for complete objects, not members.
   // This type is used in <forward_list>, <future>, <bits/shared_ptr_base.h>
   // and <bits/hashtable_policy.h>, but ideally they would use __aligned_membuf
@@ -113,6 +117,7 @@ namespace __gnu_cxx
       _M_ptr() const noexcept
       { return static_cast<const _Tp*>(_M_addr()); }
     };
+#endif
 
 } // namespace