https://gcc.gnu.org/g:b1fe718cbe0c8883af89f52e0aad3ebf913683de
commit r15-1227-gb1fe718cbe0c8883af89f52e0aad3ebf913683de
Author: Patrick Palka <ppa...@redhat.com>
Date: Wed Jun 12 20:05:05 2024 -0400
c++: visibility wrt concept-id as targ [PR115283]
Like with alias templates, it seems we don't maintain visibility flags
for concepts either, so min_vis_expr_r should ignore them for now.
Otherwise after r14-6789 we may incorrectly give a function template that
uses a concept-id in its signature internal linkage.
PR c++/115283
gcc/cp/ChangeLog:
* decl2.cc (min_vis_expr_r) <case TEMPLATE_DECL>: Ignore
concepts.
gcc/testsuite/ChangeLog:
* g++.dg/template/linkage5.C: New test.
Reviewed-by: Jason Merrill <ja...@redhat.com>
Diff:
---
gcc/cp/decl2.cc | 5 +++--
gcc/testsuite/g++.dg/template/linkage5.C | 14 ++++++++++++++
2 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/gcc/cp/decl2.cc b/gcc/cp/decl2.cc
index 7baff46a1921..6c3ef60d51f8 100644
--- a/gcc/cp/decl2.cc
+++ b/gcc/cp/decl2.cc
@@ -2723,9 +2723,10 @@ min_vis_expr_r (tree *tp, int */*walk_subtrees*/, void
*data)
break;
case TEMPLATE_DECL:
- if (DECL_ALIAS_TEMPLATE_P (t))
+ if (DECL_ALIAS_TEMPLATE_P (t) || standard_concept_p (t))
/* FIXME: We don't maintain TREE_PUBLIC / DECL_VISIBILITY for
- alias templates so we can't trust it here (PR107906). */
+ alias templates so we can't trust it here (PR107906). Ditto
+ for concepts. */
break;
t = DECL_TEMPLATE_RESULT (t);
/* Fall through. */
diff --git a/gcc/testsuite/g++.dg/template/linkage5.C
b/gcc/testsuite/g++.dg/template/linkage5.C
new file mode 100644
index 000000000000..7e8f93f546f1
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/linkage5.C
@@ -0,0 +1,14 @@
+// PR c++/115283
+// { dg-final { scan-assembler "(weak|glob)\[^\n\]*_Z1fIiEv1AIX1CIT_EEE" } }
+// { dg-do compile { target c++20 } }
+
+template<class T>
+concept C = true;
+
+template<bool B>
+struct A { };
+
+template<class T>
+void f(A<C<T>>) { }
+
+template void f<int>(A<true>);
