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[Bug c++/78001] New: [7 Regression] ncurses build error


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78001

            Bug ID: 78001
           Summary: [7 Regression] ncurses build error
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
  Target Milestone: ---

markus@x4 tmp % cat cursesf.ii
class A {
protected:
  void m_fn1();
};
template <class> struct B : A {
  void m_fn2() const { m_fn1(); }
};

markus@x4 tmp % icpc -c cursesf.ii
markus@x4 tmp % clang++ -c cursesf.ii
markus@x4 tmp % g++-6 -c cursesf.ii
markus@x4 tmp % g++ -c cursesf.ii
cursesf.ii: In member function ‘void B< <template-parameter-1-1> >::m_fn2()
const’:
cursesf.ii:6:30: error: no matching function for call to ‘B<
<template-parameter-1-1> >::m_fn1() const’
   void m_fn2() const { m_fn1(); }
                              ^
cursesf.ii:3:8: note: candidate: void A::m_fn1() <near match>
   void m_fn1();
        ^~~~~
cursesf.ii:3:8: note:   passing ‘const B< <template-parameter-1-1> >*’ as
‘this’ argument discards qualifiers

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