[PATCH] fix warning from pack-objects.c

When compiling on ia64 I get this warning (from gcc 3.4.3):

gcc -o pack-objects.o -c -g -O2 -Wall -DSHA1_HEADER='<openssl/sha.h>'  pack-objects.c
pack-objects.c: In function `pack_revindex_ix':
pack-objects.c:94: warning: cast from pointer to integer of different size

A double cast (first to long, then to int) shuts gcc up, but is there
a better way?

Signed-off-by: Tony Luck <tony.luck@intel.com>

---

diff --git a/pack-objects.c b/pack-objects.c
index 8f352aa..c985fab 100644
--- a/pack-objects.c
+++ b/pack-objects.c

@@ -91,7 +91,7 @@ static int reused_delta = 0;
 
 static int pack_revindex_ix(struct packed_git *p)
 {
-	unsigned int ui = (unsigned int) p;
+	unsigned int ui = (unsigned int)(long)p;
 	int i;
 
 	ui = ui ^ (ui >> 16); /* defeat structure alignment */

Luck, Tony wrote:

When compiling on ia64 I get this warning (from gcc 3.4.3):

gcc -o pack-objects.o -c -g -O2 -Wall -DSHA1_HEADER='<openssl/sha.h>'  pack-objects.c
pack-objects.c: In function `pack_revindex_ix':
pack-objects.c:94: warning: cast from pointer to integer of different size

A double cast (first to long, then to int) shuts gcc up, but is there
a better way?

Make ui and i unsigned long and cast p to unsigned long (or perhaps 
ptrdiff_t is preferred?). On 32-bit archs it's no difference, but 64-bit 
archs can work with their native size. It's slightly faster (although I 
expect the compiler takes care of that anyways).

I noticed this earlier on my shiny AMD FX2 64-bit. The tests run just 
fine with my solution. I expect they will with yours as well.

-- 
Andreas Ericsson                   andreas.ericsson@op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231