CGAL users discussion list

[Pádraig Ó Conbhuí <>]

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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