From 07e831947832804cbe7bc22756dd6c8403f24f36 Mon Sep 17 00:00:00 2001
From: Jeffrey Walton <noloader@gmail.com>
Date: Thu, 23 Jul 2015 14:21:06 -0400
Subject: [PATCH] Cleared "unused function" warning when using GCC with -Wall

---
 cpu.cpp      | 25 +++++++++++++++----------
 eccrypto.cpp | 14 ++++++++++----
 misc.h       |  8 ++++++++
 3 files changed, 33 insertions(+), 14 deletions(-)

diff --git a/cpu.cpp b/cpu.cpp
index b052c9d7..8d784262 100644
--- a/cpu.cpp
+++ b/cpu.cpp
@@ -33,21 +33,26 @@ bool CpuId(word32 input, word32 *output)
 
 #ifndef CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
 extern "C" {
-typedef void (*SigHandler)(int);
+  typedef void (*SigHandler)(int);
 
-static jmp_buf s_jmpNoCPUID;
-static void SigIllHandlerCPUID(int)
-{
+  static jmp_buf s_jmpNoCPUID;
+  static jmp_buf s_jmpNoSSE2;
+
+  //  Declare it so we can attach the attribute
+  static void SigIllHandlerCPUID(int) CRYPTOPP_UNUSED_FUNCTION;
+  static void SigIllHandlerCPUID(int)
+  {
 	longjmp(s_jmpNoCPUID, 1);
-}
+  }
 
-static jmp_buf s_jmpNoSSE2;
-static void SigIllHandlerSSE2(int)
-{
+  //  Declare it so we can attach the attribute
+  static void SigIllHandlerSSE2(int) CRYPTOPP_UNUSED_FUNCTION;
+  static void SigIllHandlerSSE2(int)
+  {
 	longjmp(s_jmpNoSSE2, 1);
+  }
 }
-}
-#endif
+#endif // CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
 
 bool CpuId(word32 input, word32 *output)
 {
diff --git a/eccrypto.cpp b/eccrypto.cpp
index fe77d2bc..66c978b8 100644
--- a/eccrypto.cpp
+++ b/eccrypto.cpp
@@ -11,6 +11,7 @@
 #include "argnames.h"
 #include "ec2n.h"
 #include "misc.h"
+#include "trap.h"
 
 #if GCC_DIAGNOSTIC_AWARE
 # pragma GCC diagnostic ignored "-Wunused-function"
@@ -32,8 +33,7 @@ static void ECDSA_TestInstantiations()
 }
 #endif
 
-// VC60 workaround: complains when these functions are put into an anonymous namespace
-static Integer ConvertToInteger(const PolynomialMod2 &x)
+static inline Integer ConvertToInteger(const PolynomialMod2 &x)
 {
 	unsigned int l = x.ByteCount();
 	SecByteBlock temp(l);
@@ -118,7 +118,10 @@ struct OIDLessThan
 	inline bool operator()(const EcRecommendedParameters<T>& a, const EcRecommendedParameters<T>& b) {return a.oid < b.oid;}
 };
 
-static void GetRecommendedParameters(const EcRecommendedParameters<EC2N> *&begin, const EcRecommendedParameters<EC2N> *&end)
+// Declare it so we can attach the attribute
+static void GetRecommendedParameters(const EcRecommendedParameters<EC2N> *&begin, const EcRecommendedParameters<EC2N> *&end) CRYPTOPP_UNUSED_FUNCTION;
+
+void GetRecommendedParameters(const EcRecommendedParameters<EC2N> *&begin, const EcRecommendedParameters<EC2N> *&end)
 {
 	// this array must be sorted by OID
 	static const EcRecommendedParameters<EC2N> rec[] = {
@@ -253,7 +256,10 @@ static void GetRecommendedParameters(const EcRecommendedParameters<EC2N> *&begin
 	end = rec + COUNTOF(rec);
 }
 
-static void GetRecommendedParameters(const EcRecommendedParameters<ECP> *&begin, const EcRecommendedParameters<ECP> *&end)
+// Declare it so we can attach the unused attribute
+static void GetRecommendedParameters(const EcRecommendedParameters<ECP> *&begin, const EcRecommendedParameters<ECP> *&end) CRYPTOPP_UNUSED_FUNCTION;
+
+void GetRecommendedParameters(const EcRecommendedParameters<ECP> *&begin, const EcRecommendedParameters<ECP> *&end)
 {
 	// this array must be sorted by OID
 	static const EcRecommendedParameters<ECP> rec[] = {
diff --git a/misc.h b/misc.h
index 8c709631..15206561 100644
--- a/misc.h
+++ b/misc.h
@@ -95,6 +95,14 @@ struct CompileAssert
 // Cast to void. Portable way to suppress warning
 #define CRYPTOPP_UNUSED(x) ((void)x)
 
+// ************** unused function suppression ***************
+// Not portable, but nearly as old as GCC itself
+#ifdef __GNUC__
+# define CRYPTOPP_UNUSED_FUNCTION __attribute__ ((unused))
+#else
+# define CRYPTOPP_UNUSED_FUNCTION
+#endif
+
 // ************** counting elements in an array ***************
 // VS2005 added _countof macro, fails on pointers
 #ifndef COUNTOF