make gcc shut up

If -flto is used then gcc will generate a lot more warnings than before,
among them a number of use-without-initialization warnings. Most of them
without are false positives, but let's make them go away, because it
doesn't really matter.

src/backlight/backlight.c

@@ -64,7 +64,7 @@ static struct udev_device *find_pci_or_platform_parent(struct udev_device *devic
 
                 value = udev_device_get_sysattr_value(parent, "class");
                 if (value) {
-                        unsigned long class;
+                        unsigned long class = 0;
 
                         if (safe_atolu(value, &class) < 0) {
                                 log_warning("Cannot parse PCI class %s of device %s:%s.", value, subsystem, sysname);

src/boot/boot-efi.c

@@ -50,7 +50,7 @@ static char *tilt_slashes(char *s) {
 }
 
 static int get_boot_entries(struct boot_info *info) {
-        uint16_t *list;
+        uint16_t *list = NULL;
         int i, n;
         int err = 0;
 

src/cgtop/cgtop.c

@@ -98,7 +98,7 @@ static void group_hashmap_free(Hashmap *h) {
 static int process(const char *controller, const char *path, Hashmap *a, Hashmap *b, unsigned iteration) {
         Group *g;
         int r;
-        FILE *f;
+        FILE *f = NULL;
         pid_t pid;
         unsigned n;
 

src/core/dbus-manager.c

@@ -873,7 +873,7 @@ static int method_create_snapshot(sd_bus *bus, sd_bus_message *message, void *us
         Manager *m = userdata;
         const char *name;
         int cleanup;
-        Snapshot *s;
+        Snapshot *s = NULL;
         int r;
 
         assert(bus);

src/hostname/hostnamectl.c

@@ -69,7 +69,7 @@ typedef struct StatusInfo {
 } StatusInfo;
 
 static void print_status_info(StatusInfo *i) {
-        sd_id128_t mid, bid;
+        sd_id128_t mid = {}, bid = {};
         int r;
         const char *id = NULL;
         _cleanup_free_ char *pretty_name = NULL, *cpe_name = NULL;

src/journal/journal-gatewayd.c

@@ -744,7 +744,7 @@ static int request_handler_file(
 
 static int get_virtualization(char **v) {
         _cleanup_bus_unref_ sd_bus *bus = NULL;
-        char *b;
+        char *b = NULL;
         int r;
 
         r = sd_bus_default_system(&bus);
@@ -780,7 +780,7 @@ static int request_handler_machine(
         RequestMeta *m = connection_cls;
         int r;
         _cleanup_free_ char* hostname = NULL, *os_name = NULL;
-        uint64_t cutoff_from, cutoff_to, usage;
+        uint64_t cutoff_from = 0, cutoff_to = 0, usage;
         char *json;
         sd_id128_t mid, bid;
         _cleanup_free_ char *v = NULL;

src/journal/journalctl.c

@@ -1651,7 +1651,7 @@ int main(int argc, char *argv[]) {
         }
 
         if (arg_action == ACTION_DISK_USAGE) {
-                uint64_t bytes;
+                uint64_t bytes = 0;
                 char sbytes[FORMAT_BYTES_MAX];
 
                 r = sd_journal_get_usage(j, &bytes);

src/journal/sd-journal.c

@@ -1281,7 +1281,7 @@ static bool file_type_wanted(int flags, const char *filename) {
 }
 
 static int add_any_file(sd_journal *j, const char *path) {
-        JournalFile *f;
+        JournalFile *f = NULL;
         int r;
 
         assert(j);

src/libsystemd/sd-bus/bus-control.c

@@ -687,8 +687,8 @@ static int bus_get_owner_dbus1(
                 }
 
                 if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
-                        const void *p;
+                        const void *p = NULL;
-                        size_t sz;
+                        size_t sz = 0;
 
                         r = sd_bus_call_method(
                                         bus,

src/libsystemd/sd-bus/bus-message.c

@@ -1863,7 +1863,7 @@ _public_ int sd_bus_message_open_container(
         struct bus_container *c, *w;
         uint32_t *array_size = NULL;
         char *signature;
-        size_t before, begin;
+        size_t before, begin = 0;
         bool need_offsets = false;
         int r;
 

src/libsystemd/sd-bus/test-bus-memfd.c

@@ -33,7 +33,7 @@ int main(int argc, char *argv[]) {
         char *s, *name;
         uint64_t sz;
         int r, fd;
-        FILE *f;
+        FILE *f = NULL;
         char buf[3] = {};
         struct iovec iov[3] = {};
         char bufv[3][3] = {};

src/libsystemd/sd-event/sd-event.c

@@ -642,9 +642,9 @@ static int event_setup_timer_fd(
                 int *timer_fd,
                 clockid_t id) {
 
+        sd_id128_t bootid = {};
         struct epoll_event ev = {};
         int r, fd;
-        sd_id128_t bootid;
 
         assert(e);
         assert(timer_fd);
@@ -2126,7 +2126,7 @@ _public_ int sd_event_get_now_monotonic(sd_event *e, uint64_t *usec) {
 _public_ int sd_event_default(sd_event **ret) {
 
         static thread_local sd_event *default_event = NULL;
-        sd_event *e;
+        sd_event *e = NULL;
         int r;
 
         if (!ret)

src/libsystemd/sd-event/test-event.c

@@ -76,7 +76,7 @@ static int child_handler(sd_event_source *s, const siginfo_t *si, void *userdata
 }
 
 static int signal_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
-        sd_event_source *p;
+        sd_event_source *p = NULL;
         sigset_t ss;
         pid_t pid;
 
@@ -106,7 +106,7 @@ static int signal_handler(sd_event_source *s, const struct signalfd_siginfo *si,
 }
 
 static int defer_handler(sd_event_source *s, void *userdata) {
-        sd_event_source *p;
+        sd_event_source *p = NULL;
         sigset_t ss;
 
         assert(s);

src/login/logind-session.c

@@ -480,7 +480,7 @@ static int session_start_scope(Session *s) {
         if (!s->scope) {
                 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
                 _cleanup_free_ char *description = NULL;
-                char *scope, *job;
+                char *scope, *job = NULL;
 
                 description = strjoin("Session ", s->id, " of user ", s->user->name, NULL);
                 if (!description)
@@ -567,7 +567,7 @@ int session_start(Session *s) {
 
 static int session_stop_scope(Session *s, bool force) {
         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        char *job;
+        char *job = NULL;
         int r;
 
         assert(s);

src/login/test-login.c

@@ -39,7 +39,7 @@ static void test_login(void) {
         uid_t *uids;
         unsigned n;
         struct pollfd pollfd;
-        sd_login_monitor *m;
+        sd_login_monitor *m = NULL;
 
         assert_se(sd_pid_get_session(0, &session) == 0);
         printf("session = %s\n", session);

src/machine/machine.c

@@ -252,7 +252,7 @@ static int machine_start_scope(Machine *m, sd_bus_message *properties, sd_bus_er
 
         if (!m->unit) {
                 _cleanup_free_ char *escaped = NULL;
-                char *scope, *description, *job;
+                char *scope, *description, *job = NULL;
 
                 escaped = unit_name_escape(m->name);
                 if (!escaped)
@@ -322,7 +322,7 @@ int machine_start(Machine *m, sd_bus_message *properties, sd_bus_error *error) {
 
 static int machine_stop_scope(Machine *m) {
         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        char *job;
+        char *job = NULL;
         int r;
 
         assert(m);

src/network/networkd-link.c

@@ -105,7 +105,7 @@ int link_get(Manager *m, int ifindex, Link **ret) {
 }
 
 int link_add(Manager *m, struct udev_device *device, Link **ret) {
-        Link *link;
+        Link *link = NULL;
         Network *network;
         int r;
 

src/nspawn/nspawn.c

@@ -743,7 +743,7 @@ static int setup_resolv_conf(const char *dest) {
 
 static int setup_boot_id(const char *dest) {
         _cleanup_free_ char *from = NULL, *to = NULL;
-        sd_id128_t rnd;
+        sd_id128_t rnd = {};
         char as_uuid[37];
         int r;
 

src/shared/acpi-fpdt.c

@@ -83,7 +83,7 @@ struct acpi_fpdt_boot {
 int acpi_get_boot_usec(usec_t *loader_start, usec_t *loader_exit) {
         _cleanup_free_ char *buf = NULL;
         struct acpi_table_header *tbl;
-        size_t l;
+        size_t l = 0;
         struct acpi_fpdt_header *rec;
         int r;
         uint64_t ptr = 0;

src/shared/boot-timestamps.c

@@ -26,7 +26,7 @@
 #include "efivars.h"
 
 int boot_timestamps(const dual_timestamp *n, dual_timestamp *firmware, dual_timestamp *loader) {
-        usec_t x, y, a;
+        usec_t x = 0, y = 0, a;
         int r;
         dual_timestamp _n;
 

src/shared/efivars.c

@@ -130,7 +130,7 @@ int efi_get_variable(
 
 int efi_get_variable_string(sd_id128_t vendor, const char *name, char **p) {
         _cleanup_free_ void *s = NULL;
-        size_t ss;
+        size_t ss = 0;
         int r;
         char *x;
 
@@ -393,7 +393,7 @@ fail:
 static int read_usec(sd_id128_t vendor, const char *name, usec_t *u) {
         _cleanup_free_ char *j = NULL;
         int r;
-        uint64_t x;
+        uint64_t x = 0;
 
         assert(name);
         assert(u);

src/shared/sleep-config.c

@@ -220,8 +220,8 @@ static int hibernation_partition_size(size_t *size, size_t *used) {
 
 static bool enough_memory_for_hibernation(void) {
         _cleanup_free_ char *active = NULL;
-        unsigned long long act;
+        unsigned long long act = 0;
-        size_t size, used;
+        size_t size = 0, used = 0;
         int r;
 
         r = hibernation_partition_size(&size, &used);

src/shared/socket-util.c

@@ -585,7 +585,7 @@ int getpeername_pretty(int fd, char **ret) {
                 return -errno;
 
         if (sa.sa.sa_family == AF_UNIX) {
-                struct ucred ucred;
+                struct ucred ucred = {};
 
                 /* UNIX connection sockets are anonymous, so let's use
                  * PID/UID as pretty credentials instead */

src/shared/util.c

@@ -5903,7 +5903,7 @@ int proc_cmdline(char **ret) {
         int r;
 
         if (detect_container(NULL) > 0) {
-                char *buf, *p;
+                char *buf = NULL, *p;
                 size_t sz = 0;
 
                 r = read_full_file("/proc/1/cmdline", &buf, &sz);

src/test/test-cgroup-mask.c

@@ -32,7 +32,7 @@
 #include "test-helper.h"
 
 static int test_cgroup_mask(void) {
-        Manager *m;
+        Manager *m = NULL;
         Unit *son, *daughter, *parent, *root, *grandchild, *parent_deep;
         FILE *serial = NULL;
         FDSet *fdset = NULL;

src/test/test-sched-prio.c

@@ -25,7 +25,7 @@
 #include "macro.h"
 
 int main(int argc, char *argv[]) {
-        Manager *m;
+        Manager *m = NULL;
         Unit *idle_ok, *idle_bad, *rr_ok, *rr_bad, *rr_sched;
         Service *ser;
         FILE *serial = NULL;

src/test/test-unit-name.c

@@ -110,7 +110,7 @@ static void test_replacements(void) {
 }
 
 static int test_unit_printf(void) {
-        Manager *m;
+        Manager *m = NULL;
         Unit *u, *u2;
         int r;
 

src/test/test-util.c

@@ -567,11 +567,11 @@ static void test_in_set(void) {
 
 static void test_writing_tmpfile(void) {
         char name[] = "/tmp/test-systemd_writing_tmpfile.XXXXXX";
-        _cleanup_free_ char *contents;
+        _cleanup_free_ char *contents = NULL;
         size_t size;
         int fd, r;
-
         struct iovec iov[3];
+
         IOVEC_SET_STRING(iov[0], "abc\n");
         IOVEC_SET_STRING(iov[1], ALPHANUMERICAL "\n");
         IOVEC_SET_STRING(iov[2], "");

src/tty-ask-password-agent/tty-ask-password-agent.c

@@ -361,7 +361,7 @@ static int parse_password(const char *filename, char **wall) {
 
                 } else {
                         int tty_fd = -1;
-                        char *password;
+                        char *password = NULL;
 
                         if (arg_console)
                                 if ((tty_fd = acquire_terminal("/dev/console", false, false, false, (usec_t) -1)) < 0) {

src/udev/udev-ctrl.c

@@ -180,7 +180,7 @@ int udev_ctrl_get_fd(struct udev_ctrl *uctrl)
 struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl)
 {
         struct udev_ctrl_connection *conn;
-        struct ucred ucred;
+        struct ucred ucred = {};
         const int on = 1;
         int r;