[llvm-bugs] [Bug 28408] New: clang rejects valid (?) C++ code invoking base class destructor

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28408

            Bug ID: 28408
           Summary: clang rejects valid (?) C++ code invoking base class
                    destructor
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: su at cs.ucdavis.edu
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

The current clang trunk rejects the following valid C++ test case (which is
accepted by GCC) on x86_64-linux-gnu in both 32-bit and 64-bit modes. 

It is also rejected by all versions since at least as early as 3.0. 

However, if we replace the code 

b->~A (); 

with

b->A::~A (); 

it is accepted. 


$ clang++-trunk -v
clang version 3.9.0 (trunk 274457)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.1.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$ 
$ clang++-trunk -c good.cpp
good.cpp:14:7: error: destructor type 'A' in object destruction expression does
not match the type 'B' of the object
      being destroyed
  b->~A (); 
      ^
good.cpp:1:8: note: type 'A' is declared here
struct A 
       ^
1 error generated.
$ 
$ g++-6.1 -c -Wall -Wextra -pedantic -std=c++98 good.cpp
$ 
$ cat good.cpp
struct A 
{
  virtual ~A () {}
};

struct B : public A 
{
  virtual ~B () {} 
};

void foo ()
{
  B *b = new B;
  b->~A (); 
  // but okay: b->A::~A(); 
}

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20160704/fcecb1d5/attachment.html>