[Bug c++/98944] New: [modules] Failed to read compiled module with a non-exported partition.

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98944

            Bug ID: 98944
           Summary: [modules] Failed to read compiled module with a
                    non-exported partition.
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: iains at gcc dot gnu.org
  Target Milestone: ---

Example 1 from the std:

tu1:
export module A;
export import :Foo;
export int baz();

tu2:
export module A:Foo;
import :Internals;
export int foo() { return 2 * (bar() + 1); }

tu3:
module A:Internals;
int bar();

tu4:
module A;
import :Internals;
int bar() { return baz() - 10; }
int baz() { return 30; }

====

g++ -std=c++20 -fmodules-ts /source/test/module/mu-tu-3.cxx -S
g++ -std=c++20 -fmodules-ts /source/test/module/mu-tu-2.cxx -S
g++ -std=c++20 -fmodules-ts /source/test/module/mu-tu-1.cxx -S

ls gcm.cache/
A-Foo.gcm       A-Internals.gcm A.gcm

g++ -std=c++20 -fmodules-ts /source/test/module/mu-tu-4.cxx -S
A: error: failed to read compiled module: Bad file data
A: note: compiled module file is ‘gcm.cache/A.gcm’
...