8572edc828
The conversion function year_month_weekday::operator sys_days computes
the offset in days from the first weekday of the month with:
days{(index()-1)*7}
^~~~~~~~~~~~~ type 'unsigned'
We want the above to yield -7d when index() is 0u, but our 'days' alias
is based on long instead of int, so the conversion from unsigned to the
underlying type of 'days' instead yields a large positive value.
This patch fixes this by casting the result of index() to int so that
the initializer is sign-extended in the conversion to long.
The added testcase also verifies we do the right thing when index() == 5.
libstdc++-v3/ChangeLog:
PR libstdc++/96713
* include/std/chrono (year_month_weekday::operator sys_days):
Cast the result of index() to int so that the initializer for
days{} is sign-extended when it's converted to the underlying
type.
* testsuite/std/time/year_month_weekday/3.cc: New test.
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