[PATCH] D19312: Warn about UB at member function calls from base class ctor initializers.

[Raphael Isemann via cfe-commits]

teemperor created this revision.
teemperor added a reviewer: rsmith.
teemperor added a subscriber: cfe-commits.

  According to [12.6.2 p16] calling member functions of the current
  class before all the base classes are initialized is undefined behavior.
  Some compilers (such as GCC 5.3 + ubsan) can produce a segfaulting code 
  in the program when such code is encountered (see GCC bug #70035),
  so clang should generate a warning about the UB.

http://reviews.llvm.org/D19312

Files:
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/Sema/SemaDeclCXX.cpp
  test/SemaCXX/ctor-init-with-member-call.cpp

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