Unexpected undefined reference to implicitly declared destructor #39155
Description
| Bugzilla Link | 39808 |
| Version | unspecified |
| OS | Linux |
| Attachments | Source code, Preprocessed source |
| Reporter | LLVM Bugzilla Contributor |
| CC | @dwblaikie,@DougGregor,@zygoloid |
Extended Description
Dear all,
When compiling the program below (which was stripped down to its bare mininum)
#include <boost/container/static_vector.hpp>
// Comment either of the lines marked as 1, 2, or 3 to make
// the problem go away
// Alternatively, uncomment line marked as 4 to make the
// problem go away
struct B final {
B(void) { ; } // 1
};
struct A {
boost::container::static_vector<B, 32> vec; // 2
B elem; // 3
// ~A() {} // 4
};
A *init(void) {
return new A{};
}
void end(A *a) {
delete a;
}
int main(void) {
end(init());
return 0;
}The result is an unexpected undefined reference to an implicitly declared destructor:
clang++ -O0 -std=c++11 -I/opt/local/include -o a a.cpp
/tmp/a-31ee39.o: In function `init()':
a.cpp:(.text+0x62): undefined reference to `boost::container::static_vector<B, 32ul>::~static_vector()'
/tmp/a-31ee39.o: In function `A::~A()':
a.cpp:(.text._ZN1AD2Ev[_ZN1AD2Ev]+0x11): undefined reference to
`boost::container::static_vector<B, 32ul>::~static_vector()'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I am no C++ Jedi, but I can't understand why this would be the case. I am even more confused as to why commenting or uncommenting the lines as marked can eliminate the issue. For what is worth, g++ 7.3.0 has no problem compiling this code, whereas clang-6 and clang-7 show the same odd behavior. There is nothing special with boost either, as I tried several versions. The one I am currently using is 1.65.1.
If this behavior is expected, I'd be very happy if somebody could clarify this to me.
Kind regards,
Diego