[MacPorts] #41794: Gcc48 incompatible with opencv

[MacPorts]

#41794: Gcc48 incompatible with opencv
---------------------------------+--------------------------------
  Reporter:  giacomo.dabisias@…  |      Owner:  macports-tickets@…
      Type:  defect              |     Status:  new
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:  2.2.1
Resolution:                      |   Keywords:
      Port:  gcc48, opencv       |
---------------------------------+--------------------------------
Changes (by ryandesign@…):

 * cc: ryandesign@…, mww@…, stromnov@… (added)
 * port:   => gcc48, opencv


Old description:

> I installed using macport gcc48 and opencv. I tried to compile a simple
> opencv example with the compiler and I get:
>
> Undefined symbols for architecture x86_64:
>   "cv::namedWindow(std::basic_string<char, std::char_traits<char>,
> std::allocator<char> > const&, int)", referenced from:
>       _main in ccot2eJS.o
>   "cv::VideoCapture::VideoCapture(std::basic_string<char,
> std::char_traits<char>, std::allocator<char> > const&)", referenced from:
>       _main in ccot2eJS.o
>   "cv::imshow(std::basic_string<char, std::char_traits<char>,
> std::allocator<char> > const&, cv::_InputArray const&)", referenced from:
>       _main in ccot2eJS.o
> ld: symbol(s) not found for architecture x86_64
> collect2: error: ld returned 1 exit status
>
> If i use the gcc provided by apple or clang the program compiles. I also
> tried to recompile opencv by myself and i still get the same error. I
> tested all this also on a second
> machine having the same results. It seems that there is some
> incompatibility between gcc48 and opencv.

New description:

 I installed using macport gcc48 and opencv. I tried to compile a simple
 opencv example with the compiler and I get:

 {{{
 Undefined symbols for architecture x86_64:
   "cv::namedWindow(std::basic_string<char, std::char_traits<char>,
 std::allocator<char> > const&, int)", referenced from:
       _main in ccot2eJS.o
   "cv::VideoCapture::VideoCapture(std::basic_string<char,
 std::char_traits<char>, std::allocator<char> > const&)", referenced from:
       _main in ccot2eJS.o
   "cv::imshow(std::basic_string<char, std::char_traits<char>,
 std::allocator<char> > const&, cv::_InputArray const&)", referenced from:
       _main in ccot2eJS.o
 ld: symbol(s) not found for architecture x86_64
 collect2: error: ld returned 1 exit status
 }}}

 If i use the gcc provided by apple or clang the program compiles. I also
 tried to recompile opencv by myself and i still get the same error. I
 tested all this also on a second
 machine having the same results. It seems that there is some
 incompatibility between gcc48 and opencv.

--

Comment:

 On what operating system? If OS X 10.9 Mavericks or later, this is
 expected because of the mismatch between libstdc++ (used by FSF GCC) and
 libc++ (used by all other compiler, including Apple's GCC, llvm-gcc and
 clang). The solution is to use a compiler other than FSF GCC.

-- 
Ticket URL: <https://trac.macports.org/ticket/41794#comment:1>
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