[C++11 Compat] Fix breaking change in C++11 pair copyctor.
While this code is valid C++98, it is not valid C++11. The problem can be
reduced to:
class MDNode;
class DIType {
operator MDNode*() const {return 0;}
};
class WeakVH {
WeakVH(MDNode*) {}
};
int main() {
DIType di;
std::pair<void*, WeakVH> p(std::make_pair((void*)0, di)));
}
This was not detected by any of the bots we have because they either compile
C++98 with libstdc++ (which allows it), or C++11 with libc++ (which incorrectly
allows it). I ran into the problem when compiling with VS 2012 RC.
Thanks to Richard for explaining the issue.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158245 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed