c++: Fix deprecated attribute handling on templates (PR c++/93228)

As the following testcase shows, when deprecated attribute is on a template,
we'd never print the message if any, because the attribute is not
present on the TEMPLATE_DECL with which warn_deprecated_use is called,
but on its DECL_TEMPLATE_RESULT or its type.

2020-01-17  Jakub Jelinek  <jakub@redhat.com>

	PR c++/93228
	* parser.c (cp_parser_template_name): Look up deprecated attribute
	in DECL_TEMPLATE_RESULT or its type's attributes.

	* g++.dg/cpp1y/attr-deprecated-3.C: New test.

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index c37e461..d76675e 100644 (file)
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,9 @@
+2020-01-17  Jakub Jelinek  <jakub@redhat.com>
+
+       PR c++/93228
+       * parser.c (cp_parser_template_name): Look up deprecated attribute
+       in DECL_TEMPLATE_RESULT or its type's attributes.
+
 2020-01-16  Jason Merrill  <jason@redhat.com>
 
        PR c++/93286 - ICE with __is_constructible and variadic template.

diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index c5f9798..728474d 100644 (file)
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -16884,7 +16884,17 @@ cp_parser_template_name (cp_parser* parser,
     {
       if (TREE_DEPRECATED (decl)
          && deprecated_state != DEPRECATED_SUPPRESS)
-       warn_deprecated_use (decl, NULL_TREE);
+       {
+         tree d = DECL_TEMPLATE_RESULT (decl);
+         tree attr;
+         if (TREE_CODE (d) == TYPE_DECL)
+           attr = lookup_attribute ("deprecated",
+                                    TYPE_ATTRIBUTES (TREE_TYPE (d)));
+         else
+           attr = lookup_attribute ("deprecated",
+                                    DECL_ATTRIBUTES (d));
+         warn_deprecated_use (decl, attr);
+       }
     }
   else
     {

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index a4290ee..53c7efc 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2020-01-17  Jakub Jelinek  <jakub@redhat.com>
+
+       PR c++/93228
+       * g++.dg/cpp1y/attr-deprecated-3.C: New test.
+
 2020-01-17  Richard Sandiford  <richard.sandiford@arm.com>
 
        * g++.target/aarch64/sve/acle/general-c++/gimplify_1.C: New test.

diff --git a/gcc/testsuite/g++.dg/cpp1y/attr-deprecated-3.C b/gcc/testsuite/g++.dg/cpp1y/attr-deprecated-3.C
new file mode 100644 (file)
index 0000000..16e5018
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1y/attr-deprecated-3.C
@@ -0,0 +1,13 @@
+// PR c++/93228
+// { dg-do compile { target c++14 } }
+
+template <typename T>
+struct [[deprecated("foo")]] bar {};   // { dg-message "declared here" }
+struct [[deprecated("baz")]] qux {};   // { dg-message "declared here" }
+
+void
+quux ()
+{
+  bar<int> b;  // { dg-warning "is deprecated: foo" }
+  qux c;       // { dg-warning "is deprecated: baz" }
+}