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

diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h
index 60e6dafc5494ff144966b0ab88d9133b27d19e5b..f46b448ce0d20df535d14a8e249ecd4b8dfa8ed1 100644 (file)
--- 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 91d4e2e5ea4c63d8dad2f12111d465bee7326a34..f569d4045ecca4c1f9008068fdd56f7032588c45 100644 (file)
--- 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 f26b2265bce55682dc58f90f1a87cefd1d810c45..6176801b7a743d5750d16fad93f9261074890500 100644 (file)
--- 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 74013533b0f6761cf80ceba141ec18e94057a046..f5bf159a879f3b37dd93604c3c316a377d44ecd7 100644 (file)
--- 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);
     }
 

diff --git a/gcc/testsuite/g++.dg/modules/init-4_a.C b/gcc/testsuite/g++.dg/modules/init-4_a.C
new file mode 100644 (file)
index 0000000..e0eb97b
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/init-4_a.C
@@ -0,0 +1,9 @@
+// PR c++/112899
+// { dg-additional-options "-fmodules-ts" }
+// { dg-module-cmi M }
+
+export module M;
+
+export struct A {
+  static constexpr int x = -1;
+};

diff --git a/gcc/testsuite/g++.dg/modules/init-4_b.C b/gcc/testsuite/g++.dg/modules/init-4_b.C
new file mode 100644 (file)
index 0000000..d28017a
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/init-4_b.C
@@ -0,0 +1,11 @@
+// PR c++/112899
+// { dg-module-do run }
+// { dg-additional-options "-fmodules-ts" }
+
+import M;
+
+int main() {
+  const int& x = A::x;
+  if (x != -1)
+    __builtin_abort();
+}

diff --git a/gcc/testsuite/g++.dg/modules/init-6_a.H b/gcc/testsuite/g++.dg/modules/init-6_a.H
new file mode 100644 (file)
index 0000000..1c3fe45
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/init-6_a.H
@@ -0,0 +1,20 @@
+// { dg-additional-options "-fmodule-header" }
+// { dg-module-cmi {} }
+
+template <bool _DecOnly>
+struct __from_chars_alnum_to_val_table {
+  static inline int value = 42;
+};
+
+inline unsigned char
+__from_chars_alnum_to_val() {
+  return __from_chars_alnum_to_val_table<false>::value;
+}
+
+template <bool Foo>
+static inline int nonclass_value = 42;
+
+inline unsigned char
+get_nonclass_val() {
+  return nonclass_value<false>;
+}

diff --git a/gcc/testsuite/g++.dg/modules/init-6_b.C b/gcc/testsuite/g++.dg/modules/init-6_b.C
new file mode 100644 (file)
index 0000000..d704968
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/init-6_b.C
@@ -0,0 +1,9 @@
+// { dg-module-do link }
+// { dg-additional-options "-fmodules-ts" }
+
+import "init-6_a.H";
+
+int main() {
+  __from_chars_alnum_to_val();
+  get_nonclass_val();
+}