http://llvm.org/bugs/show_bug.cgi?id=22354
Bug ID: 22354
Summary: generic lambda capture fails with undefined reference
to custom copy ctor
Product: clang
Version: 3.5
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++14
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
When passing an object with custom copy ctor to generaic lambda capture
code compiles but fails to link with undefined reference to copy ctor.
template <typename> struct custom_copy_ctor {
custom_copy_ctor() = default;
custom_copy_ctor(custom_copy_ctor const &) {}
// custom_copy_ctor(custom_copy_ctor const&) = default; // works fine
};
int main() {
custom_copy_ctor<void> cc;
[cc](auto) {}(1);
//[cc](int){}(1); // works fine
return 0;
}
$ clang++-3.5 -std=c++14 main.cc
/tmp/main-d01cbf.o: In function `main':
main.cc:(.text+0x21): undefined reference to
`custom_copy_ctor<void>::custom_copy_ctor(custom_copy_ctor<void> const&)'
clang: error: linker command failed with exit code 1 (use -v to see
invocation)
$ clang++-3.5 --version
Debian clang version 3.5.0-9 (tags/RELEASE_350/final) (based on LLVM 3.5.0)
Target: x86_64-pc-linux-gnu
Thread model: posix
Declaring copy ctor =default prevents the issue.
Problem does not occure also when "non-generic" lambda is used
(without template function call operator)
example with online compiler
http://coliru.stacked-crooked.com/a/cc96ebfb7fbc2fca
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