From 67bcdaed9abb442c72ab214d23e8e8e04739e445 Mon Sep 17 00:00:00 2001
From: Jeffrey Walton <noloader@gmail.com>
Date: Thu, 31 Aug 2017 06:29:35 -0400
Subject: [PATCH] Fix compile under AIX 7.1

---
 config.h | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/config.h b/config.h
index 4f41ba5f..753e9add 100644
--- a/config.h
+++ b/config.h
@@ -809,7 +809,7 @@ NAMESPACE_END
 
 // ************** Instrumentation ***************
 
-// GCC does not support; see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78204
+// GCC does not support; see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=78204
 #if (CRYPTOPP_LLVM_CLANG_VERSION >= 30700) || (CRYPTOPP_APPLE_CLANG_VERSION >= 70000)
 # define CRYPTOPP_NO_SANITIZE(x) __attribute__((no_sanitize(x)))
 #else
@@ -982,10 +982,20 @@ NAMESPACE_END
 #endif // nullptr_t compilers
 
 // TODO: Emplacement, R-values and Move semantics
-// Needed because we are catching warnings with GCC and MSC
 
 #endif // CRYPTOPP_CXX11
 
+// Hack ahead. New GCC compilers like GCC 6 on AIX 7.0 or earlier don't have the
+//   synchronization gear. However, Wakely's test used for Apple does not work
+//   on the GCC/AIX combination. Another twist is we need other stuff from C++11,
+//   like no-except destructors. Dumping preprocessors shows the following may
+//   apply: http://stackoverflow.com/q/14191566/608639.
+#if defined(_AIX) && defined(__GNUC__)
+#  if !defined(_GLIBCXX_HAS_GTHREADS)
+#    undef CRYPTOPP_CXX11_SYNCHRONIZATION
+#  endif
+#endif
+
 #if defined(CRYPTOPP_CXX11_NOEXCEPT)
 #  define CRYPTOPP_THROW noexcept(false)
 #  define CRYPTOPP_NO_THROW noexcept(true)