From 9fca0c28023a177106cf58a3de6da610f185a6e4 Mon Sep 17 00:00:00 2001
From: Jeffrey Walton <noloader@gmail.com>
Date: Fri, 8 Jan 2016 15:43:09 -0500
Subject: [PATCH] Work around issue on ARMEL in MultiplyTop and GCC. ARMHF is
 OK

---
 integer.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/integer.cpp b/integer.cpp
index fcb14cef..e767bd98 100644
--- a/integer.cpp
+++ b/integer.cpp
@@ -58,6 +58,16 @@
 # define CRYPTOPP_INTEGER_SSE2 (CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE && CRYPTOPP_BOOL_X86)
 #endif
 
+// Debian QEMU/ARMEL issue in MultiplyTop; see http://github.com/weidai11/cryptopp/issues/31.
+#if __ARMEL__ && (CRYPTOPP_GCC_VERSION >= 50200) && (CRYPTOPP_GCC_VERSION < 50300) && __OPTIMIZE__
+# define WORKAROUND_ARMEL_BUG 1
+#endif
+
+#if WORKAROUND_ARMEL_BUG
+# pragma GCC push_options
+# pragma GCC optimize("O1")
+#endif
+
 NAMESPACE_BEGIN(CryptoPP)
 
 bool AssignIntToInteger(const std::type_info &valueType, void *pInteger, const void *pInt)
@@ -4373,4 +4383,8 @@ std::string IntToString<unsigned long long>(unsigned long long value, unsigned i
 
 NAMESPACE_END
 
+#if WORKAROUND_ARMEL_BUG
+# pragma GCC pop_options
+#endif
+
 #endif