CGAL users discussion list

[Oren Shpigel <>]

Hi again, 

I tried compiling everything again with the correct flags, and I still get this error when linking my code to CGAL:

# clang++-3.8 -o build/release/my_output_file -stdlib=libc++ -lc++ my_code_stuff -lCGAL -lCGAL_Core -lprofiler -ltcmalloc -lgtest -lpthread -lboost_date_time -lboost_filesystem -lcurl -ljson -lz -lboost_system -lprotobuf -lglog -lgflags -lblas -llapack

//usr/local/lib/libCGAL.so: undefined reference to `std::__1::basic_istream<char, std::__1::char_traits<char> >::operator>>(std::__1::basic_istream<char, std::__1::char_traits<char> >& (*)(std::__1::basic_istream<char, std::__1::char_traits<char> >&))'

//usr/local/lib/libCGAL.so: undefined reference to `std::__1::basic_istream<char, std::__1::char_traits<char> >::operator>>(std::__1::basic_istream<char, std::__1::char_traits<char> >& (*)(std::__1::basic_istream<char, std::__1::char_traits<char> >&))'

When checking my CGAL's dependencies it looks good, no libstdc++ anywhere:

# ldd -r /usr/local/lib/libCGAL.so 

linux-vdso.so.1 =>  (0x00007fff3f2ae000)

libmpfr.so.4 => /usr/local/lib/libmpfr.so.4 (0x00007f77e491f000)

libgmp.so.10 => /usr/local/lib/libgmp.so.10 (0x00007f77e46a9000)

libboost_thread.so.1.55.0 => /usr/local/lib/libboost_thread.so.1.55.0 (0x00007f77e448f000)

libboost_system.so.1.55.0 => /usr/local/lib/libboost_system.so.1.55.0 (0x00007f77e428b000)

libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f77e406d000)

libc++.so.1 => /usr/lib/libc++.so.1 (0x00007f77e3d15000)

libc++abi.so.1 => /usr/lib/libc++abi.so.1 (0x00007f77e3aa0000)

libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f77e379a000)

libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f77e3584000)

libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f77e31bf000)

/lib64/ld-linux-x86-64.so.2 (0x00007f77e4da6000)

librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f77e2fb7000)

undefined symbol: _ZNSt3__113basic_istreamIcNS_11char_traitsIcEEErsEPFRS3_S4_E (/usr/local/lib/libCGAL.so)

But again, also ldd says this same undefined symbol:

# c++filt _ZNSt3__113basic_istreamIcNS_11char_traitsIcEEErsEPFRS3_S4_E

std::__1::basic_istream<char, std::__1::char_traits<char> >::operator>>(std::__1::basic_istream<char, std::__1::char_traits<char> >& (*)(std::__1::basic_istream<char, std::__1::char_traits<char> >&))

Anyone has any idea about why it's missing? Or what is using it?

Has anyone ever compiled CGAL 4.8 with clang 3.8 and libc++?

Thanks!

Oren

On Mon, Jan 30, 2017 at 2:43 AM Pádraig Ó Conbhuí <> wrote:

Hi Oren,

This sounds like an error between one library looking for libc++ and another looking for libstdc++. Using -std=c++11 can cause libc++ to link unless you explicitly pass -stdlib=libstdc++ (not certain if libstdc++ or just stdc++). So differences in compiler flags between gmp, mpfr, boost and cgal and the c++ library they're linking is probably the problem. And since it's c++, probably just boost and cgal. Try passing -std=c++11 -stdlib=libc++ to both boost and cgal during compile.

Cheers,

Paddy

On Sun, Jan 29, 2017 at 5:43 PM, Marc Glisse <> wrote:

On Sun, 29 Jan 2017, Oren Shpigel wrote:

Hi,
I'm trying to use CGAL with clang++-3.8 and libc++.
I compiled boost, gmp and mpfr, and then compiled CGAL with them (all with
clang++-3.8 and libc++).
But when linking my own program with CGAL I get the following error:

//usr/local/lib/libCGAL.so: undefined reference to
`std::__1::basic_istream<char, std::__1::char_traits<char>

::operator>>(std::__1::basic_istream<char, std::__1::char_traits<char> >&

(*)(std::__1::basic_istream<char, std::__1::char_traits<char> >&))'

In the CGAL website I saw that CGAL supports clang 3.5 and 3.6.2.
Do I get this error because clang 3.8 isn't supported?

No.

What has changed? Is there something I can do to use it?
Or any other idea about this linker error?

Did you link you program with libc++? It usually helps answering questions when we can actually see the command producing the error message, and the full message...

--
Marc Glisse

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