[ASTImporter] Load external Decls when getting field index.

Summary:
At equality check of fields without name the index of fields is compared.
At determining the index of a field all fields of the parent context
should be loaded from external source to find the field at all.

Reviewers: a.sidorin, a_sidorin, r.stahl

Reviewed By: a.sidorin

Subscribers: martong, cfe-commits

Differential Revision: https://reviews.llvm.org/D49796

llvm-svn: 339226

2 files changed, 6 insertions, 0 deletions

diff --git a/clang/test/ASTMerge/unnamed_fields/Inputs/il.cpp b/clang/test/ASTMerge/unnamed_fields/Inputs/il.cpp
new file mode 100644
index 00000000000..1bb0f358dcf
--- /dev/null
+++ b/clang/test/ASTMerge/unnamed_fields/Inputs/il.cpp
@@ -0,0 +1,3 @@
+void f(int X, int Y, bool Z) {
+  auto x = [X, Y, Z] { (void)Z; };
+}
diff --git a/clang/test/ASTMerge/unnamed_fields/test.cpp b/clang/test/ASTMerge/unnamed_fields/test.cpp
new file mode 100644
index 00000000000..6ae3176df4f
--- /dev/null
+++ b/clang/test/ASTMerge/unnamed_fields/test.cpp
@@ -0,0 +1,3 @@
+// RUN: %clang_cc1 -emit-pch -o %t.1.ast %S/Inputs/il.cpp
+// RUN: %clang_cc1 -ast-merge %t.1.ast -fsyntax-only %s 2>&1 | FileCheck --allow-empty %s
+// CHECK-NOT: warning: field '' declared with incompatible types in different translation units ('bool' vs. 'int')