[klibc] [PATCH] Fix up 3 klibc build warnings.

[Maciej Żenczykowski]

klibc/scripts/basic/fixdep.c: In function 'traps':
klibc/scripts/basic/fixdep.c:368: warning: dereferencing type-punned pointer will break strict-aliasing rules
klibc/scripts/basic/fixdep.c:370: warning: dereferencing type-punned pointer will break strict-aliasing rules

klibc/usr/dash/jobs.c: In function 'sprint_status':
klibc/usr/dash/jobs.c:427: warning: format not a string literal and no format arguments

klibc/usr/dash/trap.c: In function 'exitshell':
klibc/usr/dash/trap.c:354: warning: variable 'status' might be clobbered by 'longjmp' or 'vfork'

Signed-off-by: Maciej Żenczykowski <maze at google.com>
---
 scripts/basic/fixdep.c |    9 ++++++---
 usr/dash/jobs.c        |    2 +-
 usr/dash/trap.c        |    2 +-
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c
index 0b61bea..cf72251 100644
--- a/scripts/basic/fixdep.c
+++ b/scripts/basic/fixdep.c
@@ -363,11 +363,14 @@ void print_deps(void)
 
 void traps(void)
 {
-	static char test[] __attribute__((aligned(sizeof(int)))) = "CONF";
+	union {
+		int i;
+		char c[4];
+	} test = { .c = "CONF" };
 
-	if (*(int *)test != INT_CONF) {
+	if (test.i != INT_CONF) {
 		fprintf(stderr, "fixdep: sizeof(int) != 4 or wrong endianess? %#x\n",
-			*(int *)test);
+			test.i);
 		exit(2);
 	}
 }
diff --git a/usr/dash/jobs.c b/usr/dash/jobs.c
index bf770dd..43b6b98 100644
--- a/usr/dash/jobs.c
+++ b/usr/dash/jobs.c
@@ -424,7 +424,7 @@ sprint_status(char *s, int status, int sigonly)
 				goto out;
 #endif
 		}
-		col = fmtstr(s, 32, strsignal(st));
+		col = fmtstr(s, 32, "%s", strsignal(st));
 		if (WCOREDUMP(status)) {
 			col += fmtstr(s + col, 16, " (core dumped)");
 		}
diff --git a/usr/dash/trap.c b/usr/dash/trap.c
index 18c3cd1..d6706c6 100644
--- a/usr/dash/trap.c
+++ b/usr/dash/trap.c
@@ -351,7 +351,7 @@ exitshell(void)
 {
 	struct jmploc loc;
 	char *p;
-	int status;
+	volatile int status;
 
 #ifdef HETIO
 	hetio_reset_term();
-- 
1.7.1