[LLVMbugs] [Bug 11328] New: No implicit copy constructor is created for a volatile struct in a non-voatile struct

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Nov 7 10:04:07 PST 2011


             Bug #: 11328
           Summary: No implicit copy constructor is created for a volatile
                    struct in a non-voatile struct
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: FreeBSD
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: yamagi at yamagi.org
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 7587
  --> http://llvm.org/bugs/attachment.cgi?id=7587
The testcase pasted into the description

When a volatile struct is embedded into a non-volatile struct, no or an
incorrect implicit copy constructor is created for the volatile struct. See
this code:

#include <iostream>

struct Test
    int i;

    Test(int _j, int _i)
        i = _i;
        foo.j = _j;


    volatile struct Foo
        int j;
    } foo;

    void print()
        std::cout << i << " " << foo.j << std::endl;

int main()
    Test b1(1, 2);
    Test b2;

    b2 = b1;

    return 0;

While it compiles cleanly with g++ 4.6, clang++ emits an error:

yamagi at happy:pts/2 ~/temp: clang++ -std=c++11 -o test test.cc
test.cc:3:8: error: member function 'operator=' not viable: 'this' argument has
      type 'volatile struct Foo', but function is not marked volatile
struct Test
test.cc:17:18: note: 'operator=' declared here
        volatile struct Foo
test.cc:33:5: note: implicit default copy assignment operator for 'Test' first
      required here
        b2 = b1;
1 error generated.
Exit 1

The version of clang++ is:

yamagi at happy:pts/2 ~/temp: clang++ -v
clang version 3.0 (branches/release_30 143612)
Target: x86_64-unknown-freebsd8.2
Thread model: posix

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