[Bug libstdc++/125460] New: std.cc module interface unit cannot be compiled with -ffreestanding

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125460

            Bug ID: 125460
           Summary: std.cc module interface unit cannot be compiled with
                    -ffreestanding
           Product: gcc
           Version: 16.1.0
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
        Depends on: 125450
  Target Milestone: ---

This fails with a large number of errors:

g++ -fmodule-only -fmodules -fsearch-include-path bits/std.cc -c -ffreestanding

It works without -ffreestanding.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125450
[Bug 125450] [16/17 Regression] std::optional breaks in C++26 freestanding mode