[C++20] Implement context-sensitive header-name lexing and pp-import parsing in the preprocessor.

llvm-svn: 358231

1 files changed, 18 insertions, 0 deletions

diff --git a/clang/test/CXX/cpp/cpp.module/p1.cpp b/clang/test/CXX/cpp/cpp.module/p1.cpp
new file mode 100644
index 00000000000..d56375e1fc3
--- /dev/null
+++ b/clang/test/CXX/cpp/cpp.module/p1.cpp
@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 -std=c++2a -emit-header-module -fmodule-name=attrs -x c++-header %S/Inputs/empty.h %S/Inputs/attrs.h -o %t.pcm
+// RUN: %clang_cc1 -std=c++2a %s -fmodule-file=%t.pcm -E -verify -I%S/Inputs | FileCheck %s
+
+#define SEMI ;
+// expected-error@+1 {{semicolon terminating header import declaration cannot be produced by a macro}}
+import "empty.h" SEMI // CHECK: import attrs.{{.*}};
+
+#define IMPORT import "empty.h"
+IMPORT; // CHECK: import attrs.{{.*}};
+
+#define IMPORT_ANGLED import <empty.h>
+IMPORT_ANGLED; // CHECK: import attrs.{{.*}};
+
+// Ensure that macros only become visible at the semicolon.
+// CHECK: import attrs.{{.*}} ATTRS ;
+import "attrs.h" ATTRS ;
+// CHECK: {{\[\[}} ]] int n;
+ATTRS int n;