$ CONF=linux-x86-server-fastdebug make all-images
...
/home/shade/trunks/jdk-jdk/test/jdk/java/foreign/libNativeAccess.c: In function 'Java_TestNative_allocate':
/home/shade/trunks/jdk-jdk/test/jdk/java/foreign/libNativeAccess.c:121:12: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
     return (jlong)malloc(size);
            ^
/home/shade/trunks/jdk-jdk/test/jdk/java/foreign/libNativeAccess.c: In function 'Java_TestNative_free':
/home/shade/trunks/jdk-jdk/test/jdk/java/foreign/libNativeAccess.c:126:10: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
     free((void*) ptr);
          ^
cc1: all warnings being treated as errors