[Bug c++/67519] New: New warning: calls to member functions before all base classes constructed

[Bug c++/67519] New: New warning: calls to member functions before all base classes constructed

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67519

            Bug ID: 67519
           Summary: New warning: calls to member functions before all base
                    classes constructed
           Product: gcc
           Version: 4.9.4
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: enhancement
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

It's undefined to (directly or indirectly) call a member function in a
ctor-initializer before all the mem-initializers for base classes have
completed ([class.base.init] p16).

It should be possible to warn about this, at least for simple cases.

The example in [class.base.init] p16 should give two warnings:

class A {
public:
  A(int);
};

class B : public A {
  int j;
public:
  int f();
  B() : A(f()), // undefined: calls member function
                // but base A not yet initialized
  j(f()) { }    // well-defined: bases are all initialized
};

class C {
public:
  C(int);
};

class D : public B, C {
  int i;
public:
  D() : C(f()), // undefined: calls member function
                // but base C not yet initialized
  i(f()) { }    // well-defined: bases are all initialized
};

[Bug c++/67519] New warning: calls to member functions before all base classes constructed

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67519

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-09-09
     Ever confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
There might be a duplicate of this bug already.

Confirmed.

[Bug c++/67519] New warning: calls to member functions before all base classes constructed

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67519

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |trippels at gcc dot gnu.org

--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Also -fsanitize=undefined doesn't handle this issue yet.

[Bug c++/67519] warn for calls to member functions before all base classes constructed

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67519

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |manu at gcc dot gnu.org
            Summary|New warning: calls to       |warn for calls to member
                   |member functions before all |functions before all base
                   |base classes constructed    |classes constructed

--- Comment #3 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Perhaps related to PR19808 (one has to keep track of what has been initialized
while parsing the member initializer list).
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Subject: [Bug ada/66965] gnat.dg/specs/addr1.ads obsolete -- failing on trunk
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf965

--- Comment #2 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Author: ebotcazou
Date: Sat Sep 12 16:35:20 2015
New Revision: 227709

URL: https://gcc.gnu.org/viewcvs?rev"7709&root=gcc&view=rev
Log:
        PR ada/66965
        * gnat.dg/specs/addr1.ads: Remove.

Removed:
    trunk/gcc/testsuite/gnat.dg/specs/addr1.ads
Modified:
    trunk/gcc/testsuite/ChangeLog