And here's that patch.  As far as I can tell there should be no visible
change anymore, so there aren't any testcases.

Bootstrapped and regtested on x86_64-pc-linux-gnu, OK for trunk?

-- >8 --

This appears to be an oversight in the definition of module_has_cmi_p.
This change will allow us to use the function directly in more places
that need to additional work only if generating a module CMI in the
future, allowing us to do additional work only when we know we need it.

gcc/cp/ChangeLog:

        * cp-tree.h (module_has_cmi_p): Also include header units.
        (module_maybe_has_cmi_p): Update comment.
        * module.cc (set_defining_module): Only need to track
        declarations for later exporting if the module may have a CMI.
        * name-lookup.cc (pushdecl): Likewise.

Signed-off-by: Nathaniel Shead <nathanielosh...@gmail.com>
---
 gcc/cp/cp-tree.h      | 7 +++----
 gcc/cp/module.cc      | 2 +-
 gcc/cp/name-lookup.cc | 2 +-
 3 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h
index ba9e848c177..9472759d3c8 100644
--- a/gcc/cp/cp-tree.h
+++ b/gcc/cp/cp-tree.h
@@ -7381,7 +7381,7 @@ inline bool module_interface_p ()
 inline bool module_partition_p ()
 { return module_kind & MK_PARTITION; }
 inline bool module_has_cmi_p ()
-{ return module_kind & (MK_INTERFACE | MK_PARTITION); }
+{ return module_kind & (MK_INTERFACE | MK_PARTITION | MK_HEADER); }
 
 inline bool module_purview_p ()
 { return module_kind & MK_PURVIEW; }
@@ -7393,9 +7393,8 @@ inline bool named_module_purview_p ()
 inline bool named_module_attach_p ()
 { return named_module_p () && module_attach_p (); }
 
-/* We don't know if this TU will have a CMI while parsing the GMF,
-   so tentatively assume that it might, for the purpose of determining
-   whether no-linkage decls could be used by an importer.  */
+/* Like module_has_cmi_p, but tentatively assumes that this TU may have a
+   CMI if we haven't seen the module-declaration yet.  */
 inline bool module_maybe_has_cmi_p ()
 { return module_has_cmi_p () || (named_module_p () && !module_purview_p ()); }
 
diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
index 520dd710549..8639ed6f1a2 100644
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -19216,7 +19216,7 @@ set_defining_module (tree decl)
   gcc_checking_assert (!DECL_LANG_SPECIFIC (decl)
                       || !DECL_MODULE_IMPORT_P (decl));
 
-  if (module_p ())
+  if (module_maybe_has_cmi_p ())
     {
       /* We need to track all declarations within a module, not just those
         in the module purview, because we don't necessarily know yet if
diff --git a/gcc/cp/name-lookup.cc b/gcc/cp/name-lookup.cc
index 78f08acffaa..f1f8c19feb1 100644
--- a/gcc/cp/name-lookup.cc
+++ b/gcc/cp/name-lookup.cc
@@ -4103,7 +4103,7 @@ pushdecl (tree decl, bool hiding)
 
          if (level->kind == sk_namespace
              && TREE_PUBLIC (level->this_entity)
-             && module_p ())
+             && module_maybe_has_cmi_p ())
            maybe_record_mergeable_decl (slot, name, decl);
        }
     }
-- 
2.43.2

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