musl: gracefully disable utmp support (#39775)

meson.build

@@ -1028,7 +1028,6 @@ threads = dependency('threads')
 librt = cc.find_library('rt')
 libm = cc.find_library('m')
 libdl = cc.find_library('dl')
-libutmps = dependency('libutmps', required : false)
 
 # On some distributions that use musl (e.g. Alpine), libintl.h may be provided by gettext rather than musl.
 # In that case, we need to explicitly link with libintl.so.
@@ -1688,7 +1687,7 @@ foreach tuple : [
                 ['timesyncd'],
                 ['tmpfiles'],
                 ['tpm'],
-                ['utmp'],
+                ['utmp',            get_option('libc') != 'musl',     'musl does not support it'],
                 ['userdb'],
                 ['vconsole'],
                 ['xdg-autostart'],

src/include/musl/utmpx.h

@@ -1,16 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
-#pragma once
-
-#include_next <utmpx.h>
-
-#ifndef UTMPX_FILE
-#define UTMPX_FILE "/run/utmp"
-#endif
-
-#ifndef WTMPX_FILE
-#define WTMPX_FILE "/var/log/wtmp"
-#endif
-
-#ifndef ACCOUNTING
-#define ACCOUNTING 9
-#endif

src/login/meson.build

@@ -49,7 +49,6 @@ executables += [
                 'include_directories' : [libexec_template['include_directories'], include_directories('.')],
                 'extract' : systemd_logind_extract_sources,
                 'dependencies' : [
-                        libutmps,
                         threads,
                 ],
         },

src/shared/meson.build

@@ -385,7 +385,6 @@ libshared_deps = [threads,
                   librt,
                   libseccomp_cflags,
                   libselinux_cflags,
-                  libutmps,
                   libxenctrl_cflags,
                   libxz_cflags,
                   libzstd_cflags,

src/test/meson.build

@@ -473,7 +473,6 @@ executables += [
         test_template + {
                 'sources' : files('test-utmp.c'),
                 'conditions' : ['ENABLE_UTMP'],
-                'dependencies' : libutmps,
         },
         test_template + {
                 'sources' : files('test-varlink.c'),