logcat: turn on -Werror

- Deal with some -Wunused issues

Change-Id: Ic4ab9a49f13e156a73d40266e413dee3e6396178

logcat/Android.mk

@@ -7,7 +7,9 @@ LOCAL_SRC_FILES:= logcat.cpp event.logtags
 
 LOCAL_SHARED_LIBRARIES := liblog
 
-LOCAL_MODULE:= logcat
+LOCAL_MODULE := logcat
+
+LOCAL_CFLAGS := -Werror
 
 include $(BUILD_EXECUTABLE)
 

logcat/logcat.cpp

@@ -496,9 +496,6 @@ int main(int argc, char **argv)
                     android::g_logRotateSizeKBytes
                                 = DEFAULT_LOG_ROTATE_SIZE_KBYTES;
                 } else {
-                    long logRotateSize;
-                    char *lastDigit;
-
                     if (!isdigit(optarg[0])) {
                         fprintf(stderr,"Invalid parameter to -r\n");
                         android::show_help(argv[0]);

logcat/tests/logcat_test.cpp

@@ -392,7 +392,7 @@ TEST(logcat, get_) {
     ASSERT_EQ(4, count);
 }
 
-static void caught_blocking(int signum)
+static void caught_blocking(int /*signum*/)
 {
     unsigned long long v = 0xDEADBEEFA55A0000ULL;
 
@@ -461,7 +461,7 @@ TEST(logcat, blocking) {
     EXPECT_EQ(1, signals);
 }
 
-static void caught_blocking_tail(int signum)
+static void caught_blocking_tail(int /*signum*/)
 {
     unsigned long long v = 0xA55ADEADBEEF0000ULL;
 
@@ -532,7 +532,7 @@ TEST(logcat, blocking_tail) {
     EXPECT_EQ(1, signals);
 }
 
-static void caught_blocking_clear(int signum)
+static void caught_blocking_clear(int /*signum*/)
 {
     unsigned long long v = 0xDEADBEEFA55C0000ULL;