[gcc(refs/vendors/redhat/heads/gcc-10-branch)] c++: Fix deprecated attribute handling on templates (PR c++/93228)

[Jakub Jelinek]

https://gcc.gnu.org/g:04dc4b25a2a7af4eb6d54c5c2b0f8cb09fb5bcbb

commit 04dc4b25a2a7af4eb6d54c5c2b0f8cb09fb5bcbb
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Fri Jan 17 15:22:22 2020 +0100

    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:
---
 gcc/cp/ChangeLog                               |  6 ++++++
 gcc/cp/parser.c                                | 12 +++++++++++-
 gcc/testsuite/ChangeLog                        |  5 +++++
 gcc/testsuite/g++.dg/cpp1y/attr-deprecated-3.C | 13 +++++++++++++
 4 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index c37e461..d76675e 100644
--- 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
--- 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 435d4d6..29a2aa9 100644
--- 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
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" }
+}