[Bug libstdc++/91067] [9/10 Regression] Clang compiler can't link executable if std::filesystem::directory_iterator is encountered

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91067

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Jul  3 21:06:25 2019
New Revision: 273023

URL: https://gcc.gnu.org/viewcvs?rev=273023&root=gcc&view=rev
Log:
PR libstdc++/91067 fix missing exports for filesystem iterators

The copy assignment operator for recursive_directory_iterator was not
exported despite being needed. The __shared_ptr default constructors are
not needed when compiling with GCC but Clang requires them for -O1.

        PR libstdc++/91067
        * acinclude.m4 (libtool_VERSION): Bump to 6:27:0.
        * configure: Regenerate.
        * config/abi/pre/gnu.ver (GLIBCXX_3.4.27): Add new version. Export
        missing symbols.
        * testsuite/27_io/filesystem/iterators/91067.cc: New test.
        * testsuite/util/testsuite_abi.cc: Add new symbol version.

Added:
    trunk/libstdc++-v3/testsuite/27_io/filesystem/iterators/91067.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/acinclude.m4
    trunk/libstdc++-v3/config/abi/pre/gnu.ver
    trunk/libstdc++-v3/configure
    trunk/libstdc++-v3/testsuite/util/testsuite_abi.cc