enabled -pedantic for gcc build

cmake/EthCompilerSettings.cmake

@@ -3,7 +3,7 @@
 # C++11 check and activation
 if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
 
-	set(CMAKE_CXX_FLAGS "-std=c++11 -Wall -Wno-unknown-pragmas -Wextra -Werror -DSHAREDLIB -fPIC ${CMAKE_CXX_FLAGS}")
+	set(CMAKE_CXX_FLAGS "-std=c++11 -Wall -Wno-unknown-pragmas -Wextra -Werror -pedantic -DSHAREDLIB -fPIC ${CMAKE_CXX_FLAGS}")
 	set(CMAKE_CXX_FLAGS_DEBUG          "-O0 -g -DETH_DEBUG")
 	set(CMAKE_CXX_FLAGS_MINSIZEREL     "-Os -DNDEBUG -DETH_RELEASE")
 	set(CMAKE_CXX_FLAGS_RELEASE        "-O3 -DNDEBUG -DETH_RELEASE")

libethereum/CommonNet.cpp

@@ -25,4 +25,4 @@ using namespace dev;
 using namespace dev::eth;
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
-namespace { char dummy; };
+namespace { char dummy; }

libethereum/Interface.cpp

@@ -22,4 +22,4 @@
 #include "Interface.h"
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
-namespace { char dummy; };
+namespace { char dummy; }

libp2p/UDP.cpp

@@ -49,11 +49,11 @@ h256 RLPXDatagramFace::sign(Secret const& _k)
 	dev::sha3(signedRLPx).ref().copyTo(rlpxHash);
 
 	return std::move(sighash);
-};
+}
 
 Public RLPXDatagramFace::authenticate(bytesConstRef _sig, bytesConstRef _rlp)
 {
 	Signature const& sig = *(Signature const*)_sig.data();
 	return std::move(dev::recover(sig, sha3(_rlp)));
-};
+}