https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89986
Bug ID: 89986 Summary: [9 Regression] missing export for directory_iterator::increment Product: gcc Version: unknown Status: UNCONFIRMED Keywords: link-failure Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: redi at gcc dot gnu.org Target Milestone: --- #include <filesystem> int main() { std::error_code ec; std::filesystem::directory_iterator it("/", ec); it.increment(ec); } Using GCC 8 and linking to libstdc++fs.a this works, but using GCC 9 it doesn't: /usr/bin/ld: /tmp/ccC5CJow.o: in function `main': /tmp/dir.cc:7: undefined reference to `std::filesystem::__cxx11::directory_iterator::increment(std::error_code&)' collect2: error: ld returned 1 exit status I forgot to export that symbol after moving the definitions to libstdc++.so (and apparently never tested it!)