Test loader's behavior regarding loaded library at exit

Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := libpeat-test
LOCAL_SRC_FILES := lib.cpp
include $(BUILD_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := peat-test-app
LOCAL_SRC_FILES := app.c
include $(BUILD_EXECUTABLE)

# Easiest way to run: use LD_LIBRARY_PATH
include $(CLEAR_VARS)
LOCAL_MODULE := peat-test-app-linked
LOCAL_SRC_FILES := app-linked.c
LOCAL_SHARED_LIBRARIES := libpeat-test
include $(BUILD_EXECUTABLE)

app-linked.c

#include <stdio.h>
#include "lib.h"

int main(int argc, char **argv) {
    printf("from_shared() = %d\n", from_shared());

    return 0;
}

app.c

#include <stdio.h>
#include <dlfcn.h>

#ifdef LIBHYBRIS

#include <hybris/common/dlfcn.h>
#define dlopen hybris_dlopen
#define dlsym hybris_dlsym
#define dlclose hybris_dlclose

#endif

int main(int argc, char **argv) {
    void *lib;
    int (*from_shared)();

    puts("dlopen()");
    lib = dlopen("./libpeat-test.so", RTLD_NOW);

    from_shared = dlsym(lib, "from_shared");

    printf("from_shared() = %d\n", from_shared());

    if (argc >= 2 && argv[1][0] == 'y') {
        puts("dlclose()");
        dlclose(lib);

        puts("return - with dlclose()!");
    } else {
        puts("return - without dlclose()!");
    }

    return 0;
}

lib.cpp

#include <stdio.h>

#include "lib.h"

class AAA {
public:
    AAA() {}
    ~AAA() { puts("AAA destructed"); }
} aaa;

thread_local class BBB {
public:
    BBB() {}
    ~BBB() { puts("BBB destructed"); }
    void nothing() {}
} bbb;

extern "C" int from_shared() {
    // Uncomment to trigger thread_local usage
    // bbb.nothing();
    return 42;
}

__attribute__((destructor))
void libtest_destructor()
{
    puts("libtest destructor called");
}

lib.h

#ifdef __cplusplus
extern "C"
#endif
int from_shared();

Makefile

libpeat-test.so: lib.h lib.cpp
	$(CXX) -g -shared -fPIC -o libpeat-test.so lib.cpp

app: app.c
	$(CC) -g -o app app.c -ldl

app-hybris: app.c
	$(CC) -g -D LIBHYBRIS -o app-hybris app.c -lhybris-common

# Easiest way to run: use LD_LIBRARY_PATH
app-linked: app-linked.c lib.h
	$(CC) -g -o app-linked app-linked.c libpeat-test.so

.PHONY: clean
clean:
	rm -f libpeat-test.so app app-hybris app-linked