Move HOST_LONG_BITS from qemu-common.h to qemu/osdep.h

qemu-common.h should only be included by .c files.  Its file comment
explains why: "No header file should depend on qemu-common.h, as this
would easily lead to circular header dependencies."

One of the reasons for headers to include it is HOST_LONG_BITS.  Move
that to its more natural home qemu/osdep.h, to facilitate removing
these ill-advised includes later on.

This also lets us use HOST_LONG_BITS in bswap.h instead of duplicating
its definition there to avoid cyclic inclusion.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

include/qemu-common.h

@@ -23,15 +23,6 @@
 #include "qemu/option.h"
 #include "qemu/host-utils.h"
 
-/* HOST_LONG_BITS is the size of a native pointer in bits. */
-#if UINTPTR_MAX == UINT32_MAX
-# define HOST_LONG_BITS 32
-#elif UINTPTR_MAX == UINT64_MAX
-# define HOST_LONG_BITS 64
-#else
-# error Unknown pointer size
-#endif
-
 void cpu_ticks_init(void);
 
 /* icount */

include/qemu/bswap.h

@@ -419,11 +419,9 @@ static inline void stfq_be_p(void *ptr, float64 v)
 
 static inline unsigned long leul_to_cpu(unsigned long v)
 {
-    /* In order to break an include loop between here and
-       qemu-common.h, don't rely on HOST_LONG_BITS.  */
-#if ULONG_MAX == UINT32_MAX
+#if HOST_LONG_BITS == 32
     return le_bswap(v, 32);
-#elif ULONG_MAX == UINT64_MAX
+#elif HOST_LONG_BITS == 64
     return le_bswap(v, 64);
 #else
 # error Unknown sizeof long

include/qemu/osdep.h

@@ -127,6 +127,15 @@ extern int daemon(int, int);
 #define TIME_MAX LONG_MAX
 #endif
 
+/* HOST_LONG_BITS is the size of a native pointer in bits. */
+#if UINTPTR_MAX == UINT32_MAX
+# define HOST_LONG_BITS 32
+#elif UINTPTR_MAX == UINT64_MAX
+# define HOST_LONG_BITS 64
+#else
+# error Unknown pointer size
+#endif
+
 #ifndef MIN
 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
 #endif