[PATCH] c++: Improve printing of base classes [PR110745]

[Marek Polacek via Gcc-patches]

Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk?

-- >8 --

This patch changes

  warning: missing initializer for member 'D::<anonymous>' 
[-Wmissing-field-initializers]

to

  warning: missing initializer for member 'D::B' [-Wmissing-field-initializers]

        PR c++/110745

gcc/cp/ChangeLog:

        * error.cc (dump_simple_decl): Print base class name.

gcc/testsuite/ChangeLog:

        * g++.dg/diagnostic/base.C: New test.
---
 gcc/cp/error.cc                        |  2 ++
 gcc/testsuite/g++.dg/diagnostic/base.C | 16 ++++++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/diagnostic/base.C

diff --git a/gcc/cp/error.cc b/gcc/cp/error.cc
index 31319aa9e87..8a5219a68a1 100644
--- a/gcc/cp/error.cc
+++ b/gcc/cp/error.cc
@@ -1177,6 +1177,8 @@ dump_simple_decl (cxx_pretty_printer *pp, tree t, tree 
type, int flags)
     }
   else if (DECL_DECOMPOSITION_P (t))
     pp_string (pp, M_("<structured bindings>"));
+  else if (TREE_CODE (t) == FIELD_DECL && DECL_FIELD_IS_BASE (t))
+    dump_type (pp, TREE_TYPE (t), flags);
   else
     pp_string (pp, M_("<anonymous>"));
 
diff --git a/gcc/testsuite/g++.dg/diagnostic/base.C 
b/gcc/testsuite/g++.dg/diagnostic/base.C
new file mode 100644
index 00000000000..1540414072e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/diagnostic/base.C
@@ -0,0 +1,16 @@
+// PR c++/110745
+// { dg-do compile { target c++17 } }
+// { dg-options "-Wmissing-field-initializers" }
+
+struct B { int i; };
+struct D : B {
+    int x;
+    int y;
+};
+
+int
+main ()
+{
+  D d = {.x=1, .y=2}; // { dg-warning "missing initializer for member .D::B." }
+  (void)d;
+}

base-commit: b1ae46bdd19fc2aaea41bc894168bdaf4799be80
-- 
2.41.0