On Sunday, March 20, 2016 at 5:22:28 PM UTC-4, Gaetano Mendola wrote:
>
> The following snippet:
>
> #include <cryptopp/hex.h>
> int main() {
> CryptoPP::HexDecoder myHexDecoder;
> }
>
>
> does not link with clang++-3.8/clang++3.7 while it links just fine with
> gcc5.3.1
>
> $ apt-show-versions libcrypto++-dev
> libcrypto++-dev:amd64/xenial 5.6.1-9 uptodate
>
>
> The error:
> $ clang++-3.8 main.cpp -lcrypto++
> /tmp/main-1ac893.o: In function
> `CryptoPP::Unflushable<CryptoPP::Filter>::Flush(bool, int, bool)':
> main.cpp:(.text._ZN8CryptoPP11UnflushableINS_6FilterEE5FlushEbib[_ZN8CryptoPP11UnflushableINS_6FilterEE5FlushEbib]+0xf):
> undefined reference to `CryptoPP::DEFAULT_CHANNEL'
> clang: error: linker command failed with exit code 1 (use -v to see
> invocation)
>
>
CryptoPP::DEFAULT_CHANNEL is just a std::string. I'm guessing you are
mixing/matching GNU and LLVM runtimes.
You might try with the GNU runtime (clang++ -stdlib=libstdc++ ...) or the
LLVM runtime (clang++ -stdlib=libc++ ...).
If you dump symbols in libcrypto++ using nm (from -lcrypto++), then you
will see one of two things. You could see a std::__1::string (LLVM and
inlined namespace) or std::string (GNU and no additional namespace).
Obviously, LLVM tells you it needs -stdlib=libc++, while GNU tells you it
needs -stdlib=libstdc++. But its easy enough just to try them.
Also see "Where does the __1 symbol come from when using LLVM's libc++?"
(http://stackoverflow.com/q/29293394) on Stack Overflow.
Jeff
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