From a0dde47f84f17cbe7fa2fb41c14c5a2db8c4d63a Mon Sep 17 00:00:00 2001
From: Nathaniel Shead <nathanieloshead@gmail.com>
Date: Wed, 3 Jan 2024 09:27:06 +1100
Subject: c++: Emit definitions of ODR-used static members imported from
 modules [PR112899]

Static data members marked 'inline' should be emitted in TUs where they
are ODR-used.  We need to make sure that inlines imported from modules
are correctly added to the 'pending_statics' map so that they get
emitted if needed, otherwise the attached testcase fails to link.

	PR c++/112899

gcc/cp/ChangeLog:

	* cp-tree.h (note_variable_template_instantiation): Rename to...
	(note_vague_linkage_variable): ...this.
	* decl2.cc (note_variable_template_instantiation): Rename to...
	(note_vague_linkage_variable): ...this.
	* pt.cc (instantiate_decl): Rename usage of above function.
	* module.cc (trees_in::read_var_def): Remember pending statics
	that we stream in.

gcc/testsuite/ChangeLog:

	* g++.dg/modules/init-4_a.C: New test.
	* g++.dg/modules/init-4_b.C: New test.
	* g++.dg/modules/init-6_a.H: New test.
	* g++.dg/modules/init-6_b.C: New test.

Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>
Reviewed-by: Patrick Palka <ppalka@redhat.com>
Reviewed-by: Jason Merrill <jason@redhat.com
---
 gcc/cp/cp-tree.h | 2 +-
 gcc/cp/decl2.cc  | 4 ++--
 gcc/cp/module.cc | 5 +++++
 gcc/cp/pt.cc     | 2 +-
 4 files changed, 9 insertions(+), 4 deletions(-)

(limited to 'gcc/cp')

diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h
index 60e6daf..f46b448 100644
--- a/gcc/cp/cp-tree.h
+++ b/gcc/cp/cp-tree.h
@@ -7151,7 +7151,7 @@ extern tree maybe_get_tls_wrapper_call		(tree);
 extern void mark_needed				(tree);
 extern bool decl_needed_p			(tree);
 extern void note_vague_linkage_fn		(tree);
-extern void note_variable_template_instantiation (tree);
+extern void note_vague_linkage_variable		(tree);
 extern tree build_artificial_parm		(tree, tree, tree);
 extern bool possibly_inlined_p			(tree);
 extern int parm_index                           (tree);
diff --git a/gcc/cp/decl2.cc b/gcc/cp/decl2.cc
index 91d4e2e..f569d40 100644
--- a/gcc/cp/decl2.cc
+++ b/gcc/cp/decl2.cc
@@ -947,10 +947,10 @@ note_vague_linkage_fn (tree decl)
   vec_safe_push (deferred_fns, decl);
 }
 
-/* As above, but for variable template instantiations.  */
+/* As above, but for variables.  */
 
 void
-note_variable_template_instantiation (tree decl)
+note_vague_linkage_variable (tree decl)
 {
   vec_safe_push (pending_statics, decl);
 }
diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
index f26b226..6176801b 100644
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -11789,6 +11789,11 @@ trees_in::read_var_def (tree decl, tree maybe_template)
 	  DECL_INITIALIZED_P (decl) = true;
 	  if (maybe_dup && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (maybe_dup))
 	    DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = true;
+	  if (DECL_IMPLICIT_INSTANTIATION (decl)
+	      || (DECL_CLASS_SCOPE_P (decl)
+		  && !DECL_VTABLE_OR_VTT_P (decl)
+		  && !DECL_TEMPLATE_INFO (decl)))
+	    note_vague_linkage_variable (decl);
 	}
       DECL_INITIAL (decl) = init;
       if (!dyn_init)
diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
index 7401353..f5bf159 100644
--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -27300,7 +27300,7 @@ instantiate_decl (tree d, bool defer_ok, bool expl_inst_class_mem_p)
     {
       set_instantiating_module (d);
       if (variable_template_p (gen_tmpl))
-	note_variable_template_instantiation (d);
+	note_vague_linkage_variable (d);
       instantiate_body (td, args, d, false);
     }
 
-- 
cgit v1.1