On Monday, 21 March 2016 01:22:47 UTC+1, Jeffrey Walton wrote:
>
>
>
> 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
>
Thanks, I will give it a shot and I'll let you know.
Gaetano
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