1 files changed, 121 insertions, 0 deletions
diff --git a/clang/test/ClangScanDeps/modules-context-hash-from-named-module.cpp b/clang/test/ClangScanDeps/modules-context-hash-from-named-module.cpp
new file mode 100644
index 0000000..c272022
--- /dev/null
+++ b/clang/test/ClangScanDeps/modules-context-hash-from-named-module.cpp
@@ -0,0 +1,121 @@
+// Checks that driver-generated options for C++ module inputs preserve the
+// canonical module build commands compared to an equivalent non-module input,
+// and that they do not produce additional internal scanning PCMs.
+
+// RUN: rm -rf %t
+// RUN: split-file %s %t
+
+//--- main.cpp
+#include "root.h"
+import A;
+import B;
+
+auto main() -> int { return 1; }
+
+//--- A.cppm
+module;
+#include "root.h"
+export module A;
+
+//--- B.cppm
+module;
+#include "root.h"
+export module B;
+
+//--- module.modulemap
+module root { header "root.h" }
+
+//--- root.h
+// empty
+
+// RUN: %clang -std=c++23 -fmodules \
+// RUN:   -fmodules-cache-path=%t/modules-cache \
+// RUN:   %t/main.cpp %t/A.cppm %t/B.cppm \
+// RUN:   -fsyntax-only -fdriver-only -MJ %t/deps.json
+//
+// RUN: sed -e '1s/^/[/' -e '$s/,$/]/' -e 's:\\\\\?:/:g' %t/deps.json \
+// RUN:   > %t/compile_commands.json
+//
+// RUN: clang-scan-deps \
+// RUN:   -compilation-database=%t/compile_commands.json \
+// RUN:   -format experimental-full \
+// RUN:   | sed 's:\\\\\?:/:g' | FileCheck %s -DPREFIX=%/t
+
+// CHECK:      {
+// CHECK-NEXT:   "modules": [
+// CHECK-NEXT:     {
+// CHECK-NEXT:       "clang-module-deps": [],
+// CHECK-NEXT:       "clang-modulemap-file": "[[PREFIX]]/module.modulemap",
+// CHECK:            "context-hash": "[[HASH_ROOT:.*]]",
+// CHECK-NEXT:       "file-deps": [
+// CHECK-NEXT:         "[[PREFIX]]/module.modulemap",
+// CHECK-NEXT:         "[[PREFIX]]/root.h"
+// CHECK-NEXT:       ],
+// CHECK-NEXT:       "link-libraries": [],
+// CHECK-NEXT:       "name": "root"
+// CHECK-NEXT:     }
+// CHECK-NEXT:   ],
+// CHECK-NEXT:   "translation-units": [
+// CHECK-NEXT:     {
+// CHECK-NEXT:       "commands": [
+// CHECK-NEXT:         {
+// CHECK-NEXT:           "clang-context-hash": "{{.*}}",
+// CHECK-NEXT:           "named-module-deps": [
+// CHECK-NEXT:             "A",
+// CHECK-NEXT:             "B"
+// CHECK-NEXT:           ],
+// CHECK-NEXT:           "clang-module-deps": [
+// CHECK-NEXT:             {
+// CHECK-NEXT:               "context-hash": "[[HASH_ROOT]]",
+// CHECK-NEXT:               "module-name": "root"
+// CHECK-NEXT:             }
+// CHECK-NEXT:           ],
+// CHECK:                "file-deps": [
+// CHECK-NEXT:             "[[PREFIX]]/main.cpp"
+// CHECK-NEXT:           ],
+// CHECK-NEXT:           "input-file": "[[PREFIX]]/main.cpp"
+// CHECK-NEXT:         }
+// CHECK-NEXT:       ]
+// CHECK-NEXT:     },
+// CHECK-NEXT:     {
+// CHECK-NEXT:       "commands": [
+// CHECK-NEXT:         {
+// CHECK-NEXT:           "clang-context-hash": "{{.*}}",
+// CHECK-NEXT:           "named-module": "A",
+// CHECK-NEXT:           "clang-module-deps": [
+// CHECK-NEXT:             {
+// CHECK-NEXT:               "context-hash": "[[HASH_ROOT]]",
+// CHECK-NEXT:               "module-name": "root"
+// CHECK-NEXT:             }
+// CHECK-NEXT:           ],
+// CHECK:                "file-deps": [
+// CHECK-NEXT:             "[[PREFIX]]/A.cppm"
+// CHECK-NEXT:           ],
+// CHECK-NEXT:           "input-file": "[[PREFIX]]/A.cppm"
+// CHECK-NEXT:         }
+// CHECK-NEXT:       ]
+// CHECK-NEXT:     },
+// CHECK-NEXT:     {
+// CHECK-NEXT:       "commands": [
+// CHECK-NEXT:         {
+// CHECK-NEXT:           "clang-context-hash": "{{.*}}",
+// CHECK-NEXT:           "named-module": "B",
+// CHECK-NEXT:           "clang-module-deps": [
+// CHECK-NEXT:             {
+// CHECK-NEXT:               "context-hash": "[[HASH_ROOT]]",
+// CHECK-NEXT:               "module-name": "root"
+// CHECK-NEXT:             }
+// CHECK-NEXT:           ],
+// CHECK:                "file-deps": [
+// CHECK-NEXT:             "[[PREFIX]]/B.cppm"
+// CHECK-NEXT:           ],
+// CHECK-NEXT:           "input-file": "[[PREFIX]]/B.cppm"
+// CHECK-NEXT:         }
+// CHECK-NEXT:       ]
+// CHECK-NEXT:     }
+// CHECK-NEXT:   ]
+// CHECK-NEXT: }
+
+// This tests that the scanner doesn't produce multiple internal scanning PCMs
+// for our single Clang module (root).
+// RUN: find %t/modules-cache -name "*.pcm" | wc -l | grep 1