https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120379
Nathaniel Shead changed:
What|Removed |Added
Target Milestone|--- |16.0
Assignee|unassigned at gcc dot gnu.org |nshead at gcc dot
gnu.org
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #2 from Nathaniel Shead ---
I mistakenly gave the wrong PR number in the fix; this was fixed for GCC16 by
https://gcc.gnu.org/g:c6dd51c062667fdf2db3bed0ab50e034e048f3b5
commit r16-7393-gc6dd51c062667fdf2db3bed0ab50e034e048f3b5
Author: Nathaniel Shead
Date: Sat Jan 31 21:45:39 2026 +1100
c++/modules: Fix ICE with multiple module declarations and -M [PR123738]
When only doing preprocessing, we do not call declare_module, and so we
do not check that a module has been declared multiple times. This means
we end up with multiple "primary modules" being passed to the dependency
producing logic, which asserts. Fixed by checking if we've already seen
a module declaration and complaining.
PR c++/123738
gcc/cp/ChangeLog:
* module.cc (preprocess_module): Complain for any non-imported
module declaration in a module purview.
gcc/testsuite/ChangeLog:
* g++.dg/modules/dep-5.C: New test.
