CGAL users discussion list

["Toyonaga, Noah" <>]

Hello,

I am trying to install CGAL on my new computer and running into some problems apparently due to QT5 compilation. I am running Mac OS 11.0.1 (Big Sur). 

What I've done: 

- Install `CGAL` using `brew`

- Install `Qt5` using `brew install`

Both of these complete without any errors. My problem arises when I try to build a demo, specifically `Triangle` as suggested on the CGAL  website. 

I get the following long set of error, all apparently due to compiling Qt5.

In file included from /opt/homebrew/include/QtCore/qalgorithms.h:43:

/opt/homebrew/include/QtCore/qglobal.h:667:65: error: expected '>'
         typename = std::enable_if_t<std::is_arithmetic_v<T> && std::is_arithmetic_v<U> &&
                                                                ^
/opt/homebrew/include/QtCore/qglobal.h:667:65: error: expected ',' or '>' in template-parameter-list
/opt/homebrew/include/QtCore/qglobal.h:668:66: error: expected unqualified-id
                                     std::is_floating_point_v<T> == std::is_floating_point_v<U> &&
                                                                 ^
/opt/homebrew/include/QtCore/qglobal.h:679:35: error: no type named 'Promoted' in namespace
      'QTypeTraits::detail'
using Promoted = typename detail::Promoted<T, U>::type;
                 ~~~~~~~~~~~~~~~~~^~~~~~~~
/opt/homebrew/include/QtCore/qglobal.h:679:43: error: expected ';' after alias declaration
using Promoted = typename detail::Promoted<T, U>::type;
                                          ^
/opt/homebrew/include/QtCore/qglobal.h:691:31: error: no template named 'Promoted' in namespace 'QTypeTraits'
constexpr inline QTypeTraits::Promoted<T, U> qMin(const T &a, const U &b)
                 ~~~~~~~~~~~~~^
/opt/homebrew/include/QtCore/qglobal.h:693:28: error: no template named 'Promoted' in namespace 'QTypeTraits'
    using P = QTypeTraits::Promoted<T, U>;
              ~~~~~~~~~~~~~^
/opt/homebrew/include/QtCore/qglobal.h:694:5: error: unknown type name 'P'
    P _a = a;
    ^
/opt/homebrew/include/QtCore/qglobal.h:695:5: error: unknown type name 'P'
    P _b = b;
    ^
/opt/homebrew/include/QtCore/qglobal.h:699:31: error: no template named 'Promoted' in namespace 'QTypeTraits'
constexpr inline QTypeTraits::Promoted<T, U> qMax(const T &a, const U &b)
                 ~~~~~~~~~~~~~^
/opt/homebrew/include/QtCore/qglobal.h:701:28: error: no template named 'Promoted' in namespace 'QTypeTraits'
    using P = QTypeTraits::Promoted<T, U>;
              ~~~~~~~~~~~~~^
/opt/homebrew/include/QtCore/qglobal.h:702:5: error: unknown type name 'P'
    P _a = a;
    ^
/opt/homebrew/include/QtCore/qglobal.h:703:5: error: unknown type name 'P'
    P _b = b;
    ^
/opt/homebrew/include/QtCore/qglobal.h:707:31: error: no template named 'Promoted' in namespace 'QTypeTraits'
constexpr inline QTypeTraits::Promoted<T, U> qBound(const T &min, const U &val, const T &max)
                 ~~~~~~~~~~~~~^
/opt/homebrew/include/QtCore/qglobal.h:710:31: error: no template named 'Promoted' in namespace 'QTypeTraits'
constexpr inline QTypeTraits::Promoted<T, U> qBound(const T &min, const T &val, const U &max)
                 ~~~~~~~~~~~~~^
/opt/homebrew/include/QtCore/qglobal.h:713:31: error: no template named 'Promoted' in namespace 'QTypeTraits'
constexpr inline QTypeTraits::Promoted<T, U> qBound(const U &min, const T &val, const T &max)

fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.

Any guidance would be much appreciated! 

Thank you!

Noah