kbuild: fix a compile warning

Amerigo Wang · sravnborg · commit d067aa741589 · 2009-06-14T22:36:23.000+02:00
gcc-4.4.1:

 HOSTCC  scripts/basic/fixdep
scripts/basic/fixdep.c: In function 'traps':
scripts/basic/fixdep.c:377: warning: dereferencing type-punned pointer will break strict-aliasing rules
scripts/basic/fixdep.c:379: warning: dereferencing type-punned pointer will break strict-aliasing rules

(Apparently -fno-strict-aliasing will fix this too)

Signed-off-by: WANG Cong &lt;amwang@redhat.com&gt;
Signed-off-by: Andrew Morton &lt;akpm@linux-foundation.org&gt;
Signed-off-by: Sam Ravnborg &lt;sam@ravnborg.org&gt;
diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c
@@ -373,10 +373,11 @@ void print_deps(void)
 void traps(void)
 {
 	static char test[] __attribute__((aligned(sizeof(int)))) = "CONF";
+	int *p = (int *)test;
 
-	if (*(int *)test != INT_CONF) {
+	if (*p != INT_CONF) {
 		fprintf(stderr, "fixdep: sizeof(int) != 4 or wrong endianess? %#x\n",
-			*(int *)test);
+			*p);
 		exit(2);
 	}
 }

Original file line number	Diff line number	Diff line change
`@@ -373,10 +373,11 @@ void print_deps(void)`
`373`	`373`	`void traps(void)`
`374`	`374`	`{`
`375`	`375`	`static char test[] __attribute__((aligned(sizeof(int)))) = "CONF";`
	`376`	`+ int p = (int )test;`
`376`	`377`
`377`		`- if ((int )test != INT_CONF) {`
	`378`	`+ if (*p != INT_CONF) {`
`378`	`379`	`fprintf(stderr, "fixdep: sizeof(int) != 4 or wrong endianess? %#x\n",`
`379`		`- (int )test);`
	`380`	`+ *p);`
`380`	`381`	`exit(2);`
`381`	`382`	`}`
`382`	`383`	`}`