with gcc 8.2.0 parse.pass.cpp fails at line 48

[binnacle]

FYI

date_test_pass_parse_bin: /w/gpl/cpp20-date-20180915/test/date_test/parse.pass.cpp:48: void test_a(): Assertion `!in.fail()' failed.

  {
    // correct abbreviation
    std::istringstream in{"Sun 2016-12-11"};
    sys_days tp;
    in >> parse("%A %F", tp);
    assert(!in.fail());   # throws here
    assert(!in.bad());
    assert(!in.eof());
    assert(tp == 2016_y/12/11);
  }

gcc 8.2.0 along with prerequisites built on old distro, should not matter but if not reproducible contact me as needed for details

Thank you for your great contribution!

[HowardHinnant]

Here are the gcc bug reports that cause this failure:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78714
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86967
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71557

They can be worked around in date.h if you are ok with being limited to the "C" locale by compiling date.h with -DONLY_C_LOCALE=1. This flag circumvents use of the std::time_get` facet and rolls its own in date.h.

This is a common enough report that I should probably include this information in comments in parse.pass.cpp.

[binnacle]

Thank you for the workaround, though I'm a new user and have not yet reached a need for the impacted parse() behavior. Searched here but missed closed tickets, thought perhaps it was a problem related to the target system libraries or a gcc 8.2 regression.

A comment in either the unit test or the script would help save others trouble going forward, perhaps hold this ticket open till one is in place.

Congratulations on date.h being voted into ++20, really like using it!