test: Add a testcase for cleanup of C++ destructors while doing longjmp

For x86_64 and aarch64, this requires https://reviews.llvm.org/D89231.

The C++ destructors aren't executed while doing the longjmp (contrary
to how it works MSVC's C++ exceptions), but it no longer crashes.

Dockerfile.dev

@@ -92,7 +92,7 @@ COPY test/*.cpp ./test/
 RUN cd test && \
     for arch in $TOOLCHAIN_ARCHS; do \
         mkdir -p $arch && \
-        for test in hello-cpp hello-exception tlstest-main exception-locale exception-reduced global-terminate; do \
+        for test in hello-cpp hello-exception tlstest-main exception-locale exception-reduced global-terminate longjmp-cleanup; do \
             $arch-w64-mingw32-clang++ $test.cpp -o $arch/$test.exe || exit 1; \
         done; \
         for test in hello-exception; do \

run-tests.sh

@@ -63,7 +63,7 @@ TESTS_C_DLL="autoimport-lib"
 TESTS_C_LINK_DLL="autoimport-main"
 TESTS_C_NO_BUILTIN="crt-test"
 TESTS_C_ANSI_STDIO="crt-test"
-TESTS_CPP="hello-cpp global-terminate"
+TESTS_CPP="hello-cpp global-terminate longjmp-cleanup"
 TESTS_CPP_LOAD_DLL="tlstest-main"
 TESTS_CPP_EXCEPTIONS="hello-exception exception-locale exception-reduced"
 TESTS_CPP_STATIC="hello-exception"

test/longjmp-cleanup.cpp

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2020 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 <stdio.h>
+#include <setjmp.h>
+
+jmp_buf jmp;
+
+class RecurseClass {
+public:
+    RecurseClass(int v) : val(v) {
+        fprintf(stderr, "ctor %d\n", val);
+    }
+    ~RecurseClass() {
+        fprintf(stderr, "dtor %d\n", val);
+    }
+private:
+    int val;
+};
+
+void recurse(int val) {
+    RecurseClass obj(val);
+    if (val == 0) {
+          longjmp(jmp, 1);
+    }
+    if (val == 5) {
+        if (!setjmp(jmp))
+            recurse(val - 1);
+        else
+            fprintf(stderr, "returned from setjmp\n");
+    } else {
+        recurse(val - 1);
+    }
+    fprintf(stderr, "finishing function recurse %d\n", val);
+}
+
+int main(int argc, char* argv[]) {
+    recurse(10);
+    return 0;
+}