Backport upstream patch to fix C99 issue in kill

It is again necessary to run autotools during the build.

Related to:

  <https://fedoraproject.org/wiki/Changes/PortingToModernC>
  <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>

util-linux-kill-c99.patch

@@ -0,0 +1,46 @@
+commit 84732a8849a08d42a9a95dcbee9005116be78eb8
+Author: Khem Raj <raj.khem@gmail.com>
+Date:   Sun Aug 7 14:39:19 2022 -0700
+
+    check for sys/pidfd.h
+    
+    This header in newer glibc defines the signatures of functions
+    pidfd_send_signal() and pidfd_open() and when these functions are
+    defined by libc then we need to include the relevant header to get
+    the definitions. Clang 15+ has started to error out when function
+    signatures are missing.
+    
+    Fixes errors like
+    misc-utils/kill.c:402:6: error: call to undeclared function 'pidfd_send_signal'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
+            if (pidfd_send_signal(pfd, ctl->numsig, &info, 0) < 0)
+    
+    Signed-off-by: Khem Raj <raj.khem@gmail.com>
+
+diff --git a/configure.ac b/configure.ac
+index d8b4d475103c2bab..4a35d17f81375c29 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -339,6 +339,7 @@ AC_CHECK_HEADERS([ \
+ 	sys/mkdev.h \
+ 	sys/mount.h \
+ 	sys/param.h \
++	sys/pidfd.h \
+ 	sys/prctl.h \
+ 	sys/resource.h \
+ 	sys/sendfile.h \
+diff --git a/include/pidfd-utils.h b/include/pidfd-utils.h
+index eddede9767478be2..d9e33cbc57ae38c8 100644
+--- a/include/pidfd-utils.h
++++ b/include/pidfd-utils.h
+@@ -4,8 +4,10 @@
+ #ifdef HAVE_SYS_SYSCALL_H
+ # include <sys/syscall.h>
+ # if defined(SYS_pidfd_send_signal) && defined(SYS_pidfd_open)
++#  ifdef HAVE_SYS_PIDFD_H
++#   include <sys/pidfd.h>
++#  endif
+ #  include <sys/types.h>
+-
+ #  ifndef HAVE_PIDFD_SEND_SIGNAL
+ static inline int pidfd_send_signal(int pidfd, int sig, siginfo_t *info,
+ 				    unsigned int flags)

util-linux.spec

@@ -2,7 +2,7 @@
 Summary: Collection of basic system utilities
 Name: util-linux
 Version: 2.38.1
-Release: 2%{?dist}
+Release: 3%{?dist}
 License: GPLv2 and GPLv2+ and LGPLv2+ and BSD with advertising and Public Domain
 URL: https://en.wikipedia.org/wiki/Util-linux
 
@@ -38,10 +38,10 @@ BuildRequires: librtas-devel
 %endif
 
 # enable if make changes to build-system
-#BuildRequires: autoconf
-#BuildRequires: automake
-#BuildRequires: libtool
-#BuildRequires: bison
+BuildRequires: autoconf
+BuildRequires: automake
+BuildRequires: libtool
+BuildRequires: bison
 
 ### Sources
 Source0: https://www.kernel.org/pub/linux/utils/util-linux/v%{upstream_major}/util-linux-%{upstream_version}.tar.xz
@@ -93,6 +93,7 @@ Patch0: login-lastlog-create.patch
 # Add `/run/motd.d` to the hardcoded MOTD_FILE
 # https://github.com/coreos/console-login-helper-messages/issues/60
 Patch1: login-default-motd-file.patch
+Patch2: util-linux-kill-c99.patch
 
 %description
 The util-linux package contains a large variety of low-level system
@@ -288,7 +289,7 @@ chfn and chsh utilities with dependence on libuser.
 unset LINGUAS || :
 
 # enable only when make a change to the build-system
-#./autogen.sh
+./autogen.sh
 
 
 export CFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 $RPM_OPT_FLAGS"
@@ -909,6 +910,9 @@ fi
 %{_libdir}/python*/site-packages/libmount/
 
 %changelog
+* Sat Dec 17 2022 Florian Weimer <fweimer@redhat.com> - 2.38.1-3
+- Backport upstream patch to fix C99 issue in kill
+
 * Mon Aug 22 2022 Karel Zak <kzak@redhat.com> - 2.38.1-2
 - improve tmpfiles.d use in spec file