https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67632
Matt Godbolt <matt at godbolt dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |matt at godbolt dot org
--- Comment #11 from Matt Godbolt <matt at godbolt dot org> ---
I was unable to reproduce with gcc 7.2
~ $ cat > /tmp/t.cc
#include <unordered_map>
template class std::unordered_map<int, int>;
~ $ cat > /tmp/x.cc
#include <unordered_map>
extern template class std::unordered_map<int, int>;
std::unordered_map<int, int> copy(
const std::unordered_map<int, int> & a) { return a; }
main() {}
$ ~/dev/cpp-build-tools/g++ --version
g++ ('DRW) 7.2.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ g++ -std=c++11 -c t.cc
$ g++ -std=c++11 t.o x.cc
$ ./a.out
$
