================
@@ -0,0 +1,65 @@
+// RUN: rm -rf %t
+// RUN: mkdir %t
+// RUN: split-file %s %t
+
+// RUN: %clang_cc1 -std=c++20 -emit-obj -fmodules -fimplicit-module-maps
-fmodules-cache-path=%t %t/main.cpp -o %t/main.o
+
+//--- V.h
+#ifndef V_H
+#define V_H
+
+class A {
+public:
+ constexpr A() { }
+ constexpr ~A() { }
+};
+
+template <typename T>
+class V {
+public:
+ V() = default;
+
+ constexpr V(int n, const A& a = A()) {}
+};
+
+#endif
+
+//--- inst1.h
+#include "V.h"
+
+static void inst1() {
+ V<int> v;
+}
+
+//--- inst2.h
+#include "V.h"
+
+static void inst2() {
+ V<int> v(100);
+}
+
+//--- module.modulemap
+module "M" {
----------------
vgvassilev wrote:
Is that the new standard nowadays? Can we use `#pragma clang module build` and
alike to express the module setup?
https://github.com/llvm/llvm-project/pull/69076
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