Fix aliasing issue in physmem.h.

diff --git a/src/common/physmem.h b/src/common/physmem.h
index a0e72c8..c9d5039 100644 (file)
--- a/src/common/physmem.h
+++ b/src/common/physmem.h
@@ -57,17 +57,18 @@ physmem(void)
 
 #elif defined(HAVE_PHYSMEM_SYSCTL)
        int name[2] = { CTL_HW, HW_PHYSMEM };
-       unsigned long mem;
-       size_t mem_ptr_size = sizeof(mem);
-       if (!sysctl(name, 2, &mem, &mem_ptr_size, NULL, NULL)) {
+       union {
+               unsigned long ul;
+               unsigned int ui;
+       } mem;
+       size_t mem_ptr_size = sizeof(mem.ul);
+       if (!sysctl(name, 2, &mem.ul, &mem_ptr_size, NULL, NULL)) {
                // Some systems use unsigned int as the "return value".
                // This makes a difference on 64-bit boxes.
-               if (mem_ptr_size != sizeof(mem)) {
-                       if (mem_ptr_size == sizeof(unsigned int))
-                               ret = *(unsigned int *)(&mem);
-               } else {
-                       ret = mem;
-               }
+               if (mem_ptr_size == sizeof(mem.ul))
+                       ret = mem.ul;
+               else if (mem_ptr_size == sizeof(mem.ui))
+                       ret = mem.ui;
        }
 
 #elif defined(_WIN32)