[Bug c++/99327] New: ENOTSUP macro does not exist on djgpp crt

[unlvsur at live dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99327

            Bug ID: 99327
           Summary: ENOTSUP macro does not exist on djgpp crt
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: unlvsur at live dot com
  Target Milestone: ---

libstdc++'s filesystem uses std::errc::not_supported but that does not exist on
djgpp. Bootstrap failure


What I did was just

#define ENOTSUP 42

in errno.h and bootstrap succeed
However, strerror will not work for this anymore.


There is another solution for this.

Replace all std::errc::not_supported to std::errc::invalid_argument since
EINVAL should exist on all platforms.