================
@@ -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" {
----------------
dwblaikie wrote:
(not expressing any strong opinion on this patch in particular, but it'd be
great if the pragmas were more used (but also, they're currently not perfect -
my understanding is that `-frewrite-imports` isn't totally robust yet/needs
some more investment) so we had more test coverage for it because it'd be
really great if it worked well/was considered when adding new features, etc -
and I think it'd be a more direct way to write tests than needing to use the
extra split-file invocation, etc (like you could copy a single file/command
line to run a modules test, instead of splitting things, having a directory of
files to deal with/copy/whatever, etc))
https://github.com/llvm/llvm-project/pull/69076
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