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[dpo <>]

Attempting to build CGAL 4.3 in C++11 mode with Clang 425 0.28 (shipped with Xcode 4.3 on OSX) results in the following error:

Scanning dependencies of target CGAL
[ 50%] Building CXX object src/CGAL/CMakeFiles/CGAL.dir/all_files.cpp.o
Linking CXX shared library ../../lib/libCGAL.dylib
Undefined symbols for architecture x86_64:
  "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> >&))", referenced from:
      CGAL::operator>>(std::__1::basic_istream<char, std::__1::char_traits<char> >&, CGAL::File_header_extended_OFF&) in all_files.cpp.o
ld: symbol(s) not found for architecture x86_64

The complete CMake invocation is:

cmake -DCMAKE_INSTALL_PREFIX=/usr/local/Cellar/cgal/4.3 -DCMAKE_BUILD_TYPE=Release -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DCMAKE_INSTALL_NAME_DIR=/usr/local/lib -DWITH_CGAL_Qt3=OFF -DWITH_CGAL_Qt4=OFF -DWITH_CGAL_ImageIO=OFF .

A user suggested the following patch, which resolves the problem:

diff --git a/src/CGAL/File_header_extended_OFF.cpp b/src/CGAL/File_header_extended_OFF.cpp
index 3f709ff..f0e5bd3 100644
--- a/src/CGAL/File_header_extended_OFF.cpp
+++ b/src/CGAL/File_header_extended_OFF.cpp
@@ -186,7 +186,8 @@ std::istream& operator>>( std::istream& in, File_header_extended_OFF& h) {
         }
         in >> keyword;
     }
-    in >> skip_until_EOL >> skip_comment_OFF;
+    skip_until_EOL(in);
+    skip_comment_OFF(in);
     return in;
 }
 #undef CGAL_IN

The error may be due to a bug in Clang 425 and appears to be resolved in Clang 500.

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