https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116803
Nathaniel Shead <nshead at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2024-09-25
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
CC| |nshead at gcc dot gnu.org
--- Comment #1 from Nathaniel Shead <nshead at gcc dot gnu.org> ---
Confirmed. The issue is exposed because of how <execution> and <algorithm>
include each other; <execution> then <algorithm> works because execution
includes all of algorithm internally anyway, but not the other way around.
Minimised:
// a.h
template <typename T> void foo();
// b.h
import "a.h";
template <typename T> void foo() {}
// c.cpp
import "b.h";
int main() {
foo<int>();
}
'g++ -fmodules-ts a.h b.h c.cpp':
/usr/bin/ld: /tmp/ccZb7te8.o: in function `main':
x.cpp:(.text+0x5): undefined reference to `void foo<int>()'
collect2: error: ld returned 1 exit status
It looks like we don't export template definitions if we've already imported a
matching declaration.
