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

test/throwcatch-main.cpp

@@ -0,0 +1,60 @@
+/*
+ * 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.
+ */
+
+#include "throwcatch-lib.h"
+#include <string.h>
+#include <stdio.h>
+
+int main(int argc, char* argv[]) {
+    int ret = 0;
+    for (int i = 0; i <= 3; i++) {
+        int caught = 0;
+        try {
+            libFunc(i);
+        } catch (FirstException &e) {
+            fprintf(stderr, "caught FirstException\n");
+            caught = 1;
+            if (strcmp(e.what(), "first")) {
+                fprintf(stderr, "unexpected what()\n");
+                ret = 1;
+            }
+        } catch (SecondException &e) {
+            fprintf(stderr, "caught SecondException\n");
+            caught = 2;
+            if (strcmp(e.what(), "second")) {
+                fprintf(stderr, "unexpected what()\n");
+                ret = 1;
+            }
+        } catch (std::exception &e) {
+            fprintf(stderr, "caught std::exception\n");
+            caught = 3;
+        } catch (...) {
+            fprintf(stderr, "caught something else\n");
+            caught = -1;
+        }
+        if (caught != i) {
+            fprintf(stderr, "caught unexpected exception!\n");
+            ret = 1;
+        }
+    }
+    if (ret)
+        fprintf(stderr, "got errors\n");
+    else
+        fprintf(stderr, "all ok\n");
+    return ret;
+}