Illegal instruction... g++ && clang++

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0  |pateo@17:39:08 /tmp>$ clang++-3.9 -Wall  /tmp/pthread.cc -lpthread
/tmp/pthread.cc:20:1: warning: control may reach end of non-void function [-Wreturn-type]
}
^
1 warning generated.
0  |pateo@17:39:11 /tmp>$ ./a.out 
here #9
Illegal instruction (core dumped)
132|pateo@17:39:13 /tmp>$ g++ -Wall /tmp/pthread.cc -lpthread
/tmp/pthread.cc: In function ‘int startCloudThread()’:
/tmp/pthread.cc:20:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
0  |pateo@17:39:23 /tmp>$ ./a.out 
here #9

CODE

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#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

void *testThread(void *arg) {
    printf("here #%d\n", __LINE__);
    return NULL;
}

int startCloudThread() {
    pthread_t aa;
    if (pthread_create(&aa, NULL, testThread, NULL)) {
        printf("pthread_create (%s)", strerror(errno));
        return -1;
    }
    pthread_join(aa, NULL);
}

int main() {
    startCloudThread();

    return 0;
}