/usr/include/crypto++/filters.h does not compile cleanly in year 2016

[Jeff Abrahamson]

A minor bug, but clearly a bug since at least 2011:

jeff@starshine:tmp $ echo '#include <filters.h>' > wall.cpp
jeff@starshine:tmp $ g++ -Wall -c wall.cpp -I /usr/include/crypto++/
In file included from /usr/include/crypto++/simple.h:10:0,
                 from /usr/include/crypto++/filters.h:6,
                 from wall.cpp:1:
/usr/include/crypto++/algparam.h: In instantiation of ‘CryptoPP::ConstByteArrayParameter::ConstByteArrayParameter(const T&, bool) [with T = std::__cxx11::basic_string<char>]’:
/usr/include/crypto++/filters.h:793:132: required from here
/usr/include/crypto++/misc.h:59:118: warning: unused variable ‘cryptopp_assert_26’ [-Wunused-variable]
 #define CRYPTOPP_COMPILE_ASSERT_INSTANCE(assertion, instance) static CompileAssert<(assertion)> CRYPTOPP_ASSERT_JOIN(cryptopp_assert_, instance)
                                                                                                                      ^
/usr/include/crypto++/misc.h:62:39: note: in definition of macro ‘CRYPTOPP_DO_ASSERT_JOIN’
 #define CRYPTOPP_DO_ASSERT_JOIN(X, Y) X##Y
                                       ^
/usr/include/crypto++/misc.h:59:97: note: in expansion of macro ‘CRYPTOPP_ASSERT_JOIN’
 #define CRYPTOPP_COMPILE_ASSERT_INSTANCE(assertion, instance) static CompileAssert<(assertion)> CRYPTOPP_ASSERT_JOIN(cryptopp_assert_, instance)
                                                                                                 ^
/usr/include/crypto++/misc.h:55:44: note: in expansion of macro ‘CRYPTOPP_COMPILE_ASSERT_INSTANCE’
 #define CRYPTOPP_COMPILE_ASSERT(assertion) CRYPTOPP_COMPILE_ASSERT_INSTANCE(assertion, __LINE__)
                                            ^
/usr/include/crypto++/algparam.h:26:9: note: in expansion of macro ‘CRYPTOPP_COMPILE_ASSERT’
         CRYPTOPP_COMPILE_ASSERT(sizeof(CPP_TYPENAME T::value_type) == 1);
         ^
In file included from /usr/include/crypto++/filters.h:11:0,
                 from wall.cpp:1:
/usr/include/crypto++/algparam.h: In instantiation of ‘void CryptoPP::AlgorithmParametersTemplate<T>::MoveInto(void*) const [with T = CryptoPP::RandomNumberGenerator*]’:
/usr/include/crypto++/filters.h:808:1: required from here
/usr/include/crypto++/algparam.h:322:35: warning: unused variable ‘p’ [-Wunused-variable]
   AlgorithmParametersTemplate<T>* p = new(buffer) AlgorithmParametersTemplate<T>(*this);
                                   ^
In file included from /usr/include/crypto++/simple.h:10:0,
                 from /usr/include/crypto++/filters.h:6,
                 from wall.cpp:1:
/usr/include/crypto++/misc.h:549:20: warning: ‘std::__cxx11::string CryptoPP::StringNarrow(const wchar_t*, bool)’ defined but not used [-Wunused-function]
 static std::string StringNarrow(const wchar_t *str, bool throwOnError = true)
                    ^
jeff@starshine:tmp $

Of course, it's fine without -Wall.

For history (repeating itself), see also https://bugs.launchpad.net/ubuntu/+source/libcrypto++/+bug/801369

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: libcrypto++-dev 5.6.1-8
ProcVersionSignature: Ubuntu 4.2.0-34.39-generic 4.2.8-ckt4
Uname: Linux 4.2.0-34-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: i3
Date: Sat Apr 9 21:06:51 2016
Dependencies:
 gcc-5-base 5.2.1-22ubuntu2
 libc6 2.21-0ubuntu4.1
 libcrypto++9v5 5.6.1-8
 libgcc1 1:5.2.1-22ubuntu2
 libstdc++6 5.2.1-22ubuntu2
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-12-17 (114 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: libcrypto++
UpgradeStatus: Upgraded to wily on 2015-12-17 (114 days ago)

[Jeffrey Walton (noloader)]

Crypto++ should now be clean (or mostly clean) at -Wall -Wextra. Recommend closing this issue report.