test: Add a testcase for throwing/catching C++ exceptions across DLLs

test/throwcatch-lib.h

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2021 Martin Storsjo
+ *
+ * This file is part of llvm-mingw.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef THROWCATCH_LIB_H
+#define THROWCATCH_LIB_H
+
+#include <exception>
+#include <string>
+
+class FirstException : public std::exception {
+public:
+    FirstException(const char *s) : str(s) {}
+
+    const char *what() const noexcept override {
+        return str.c_str();
+    }
+
+private:
+    std::string str;
+};
+
+class SecondException : public std::exception {
+public:
+    SecondException(const char *s) : str(s) {}
+
+    const char *what() const noexcept override {
+        return str.c_str();
+    }
+
+private:
+    std::string str;
+};
+
+void libFunc(int param);
+
+#endif