3 files changed, 22 insertions, 0 deletions
diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
index c6f71e1..001430a 100644
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -219,6 +219,7 @@ Classes used:
 #include "dumpfile.h"
 #include "bitmap.h"
 #include "cgraph.h"
+#include "varasm.h"
 #include "tree-iterator.h"
 #include "cpplib.h"
 #include "mkdeps.h"
@@ -8414,6 +8415,14 @@ trees_in::decl_value ()
       if (state->is_header ()
 	  && decl_tls_wrapper_p (decl))
 	note_vague_linkage_fn (decl);
+
+      /* Setup aliases for the declaration.  */
+      if (tree alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)))
+	{
+	  alias = TREE_VALUE (TREE_VALUE (alias));
+	  alias = get_identifier (TREE_STRING_POINTER (alias));
+	  assemble_alias (decl, alias);
+	}
     }
   else
     {
diff --git a/gcc/testsuite/g++.dg/modules/pr106820_a.H b/gcc/testsuite/g++.dg/modules/pr106820_a.H
new file mode 100644
index 0000000..7d32d4e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/pr106820_a.H
@@ -0,0 +1,5 @@
+// PR c++/106820
+// { dg-additional-options "-fmodules-ts" }
+// { dg-module-cmi {} }
+
+static int __gthrw___pthread_key_create() __attribute__((__weakref__("foo")));
diff --git a/gcc/testsuite/g++.dg/modules/pr106820_b.C b/gcc/testsuite/g++.dg/modules/pr106820_b.C
new file mode 100644
index 0000000..247fe26
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/pr106820_b.C
@@ -0,0 +1,8 @@
+// PR c++/106820
+// { dg-additional-options "-fmodules-ts" }
+
+import "pr106820_a.H";
+
+int main() {
+  __gthrw___pthread_key_create();
+}