From 382877acc6c029e59e359a076d203ca03b4b9e9e Mon Sep 17 00:00:00 2001
From: Jan Synacek <jsynacek@redhat.com>
Date: Wed, 3 May 2017 14:34:36 +0200
Subject: [PATCH] compile with -Werror

The maybe-uninitialized flag has to be disabled, because gcc on RHEL7
reports tons of obvious false-positive warnings when variables are
wrapped with _cleanup_.

Also, LTO is better to be disabled. According to gcc folks, it makes
debugging really hard and is not really recommended on RHEL7. Plus it
makes the compilation fail with

In function '__ppoll_alias',
    inlined from 'bus_poll' at src/libsystemd/sd-bus/sd-bus.c:2822:11:
/usr/include/bits/poll2.h:71:9: warning: call to '__ppoll_chk_warn' declared with attribute warning: ppoll called with fds buffer too small file nfds entries
  return __ppoll_chk (__fds, __nfds, __timeout, __ss, __bos (__fds));

That is also a gcc bug, already fixed in the gcc upstream
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61886).

Resolves: #1447937
---
 configure.ac               | 12 ++----------
 src/core/main.c            |  1 -
 src/login/logind-session.c |  2 +-
 3 files changed, 3 insertions(+), 12 deletions(-)

diff --git a/configure.ac b/configure.ac
index 2734368dc0..def9fe5ce7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -187,7 +187,8 @@ CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
         -Wno-unused-parameter \
         -Wno-missing-field-initializers \
         -Wno-unused-result \
-        -Werror=overflow \
+        -Werror \
+        -Wno-error=maybe-uninitialized \
         -Wdate-time \
         -Wnested-externs \
         -ffast-math \
@@ -208,15 +209,6 @@ AS_CASE([$CC], [*clang*],
                -Wno-gnu-variable-sized-type-not-at-end \
         ])])
 
-AC_ARG_ENABLE([lto], AS_HELP_STRING([--disable-lto], [Disable Link time optimization]))
-AS_IF([test "x$enable_lto" != "xno"], [
-AS_CASE([$CFLAGS], [*-O[[12345\ ]]*], [
-         CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [-flto -ffat-lto-objects])
-         CC_CHECK_FLAGS_APPEND([with_ldflags], [LDFLAGS],[-Wl,-fuse-ld=gold])
-         ],
-[AC_MSG_RESULT([skipping -flto, optimization not enabled])])
-])
-
 AC_SUBST([OUR_CFLAGS], "$with_cflags $sanitizer_cflags")
 
 AS_CASE([$CFLAGS], [*-O[[12345sz\ ]]*],
diff --git a/src/core/main.c b/src/core/main.c
index 50c9714f78..37e3ea0ced 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -1205,7 +1205,6 @@ static int status_welcome(void) {
 
 static int write_container_id(void) {
         const char *c;
-        int r;
 
         c = getenv("container");
         if (isempty(c))
diff --git a/src/login/logind-session.c b/src/login/logind-session.c
index 4575a029fe..daf875a7d3 100644
--- a/src/login/logind-session.c
+++ b/src/login/logind-session.c
@@ -183,7 +183,7 @@ int session_save(Session *s) {
                 "STATE=%s\n"
                 "REMOTE=%i\n"
                 "STOPPING=%i\n",
-                (unsigned long) s->user->uid,
+                s->user->uid,
                 s->user->name,
                 session_is_active(s),
                 session_state_to_string(session_get_state(s)),