https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99377
Bug ID: 99377
Summary: [modules] undefined std::string_view::empty() if
referenced in inline exported function
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: boris at kolpackov dot net
Target Milestone: ---
cat <<EOF >hello.mxx
export module hello;
import <string_view>;
export namespace hello
{
inline bool check (const std::string_view& n)
{
return !n.empty ();
}
}
EOF
cat <<EOF >main.cxx
import hello;
int main ()
{
return hello::check ("World") ? 0 : 1;
}
EOF
g++ -std=c++2a -fmodules-ts -fmodule-header -x c++-header
.../include/c++/11.0.1/string_view
g++ -std=c++2a -fmodules-ts -c -x c++ hello.mxx
g++ -std=c++2a -fmodules-ts -c -x c++ main.cxx
g++ -std=c++2a -fmodules-ts hello.o main.o
main.o: In function `hello::check(std::basic_string_view<char,
std::char_traits<char> > const&)':
main.cxx:(.text._ZN5hello5checkERKSt17basic_string_viewIcSt11char_traitsIcEE[_ZN5hello5checkERKSt17basic_string_viewIcSt11char_traitsIcEE]+0x14):
undefined reference to `std::basic_string_view<char, std::char_traits<char>
>::empty() const'
The error goes away if hello::check is made non-inline.
