{systemd,udev}.pc: add names with underscores, deprecate the old ones

The names with multiple lowercase words run together are hard to read.  We
started that way with very short names like rootprefix, but then same pattern
was applied to longer and longer names. Looking at the body of .pc files
available on my machine, many packages use underscores; let's do the same. Old
names are kept for compatiblity, so this is backwards compatible.

src/core/systemd.pc.in

@@ -7,36 +7,93 @@
 #  the Free Software Foundation; either version 2.1 of the License, or
 #  (at your option) any later version.
 
+# Names with prefixes are prefered, and the run-together names should be
+# considered deprecated (though there is no plan to remove them). New names
+# shall have underscores.
+
 prefix=@prefix@
-rootprefix=@rootprefix_noslash@
-sysconfdir=@sysconfdir@
-systemdutildir=${rootprefix}/lib/systemd
-systemdsystemunitdir=${rootprefix}/lib/systemd/system
-systemdsystempresetdir=${rootprefix}/lib/systemd/system-preset
-systemduserunitdir=${prefix}/lib/systemd/user
-systemduserpresetdir=${prefix}/lib/systemd/user-preset
-systemdsystemconfdir=${sysconfdir}/systemd/system
-systemduserconfdir=${sysconfdir}/systemd/user
-systemdsystemunitpath=${systemdsystemconfdir}:/etc/systemd/system:/run/systemd/system:/usr/local/lib/systemd/system:${systemdsystemunitdir}:/usr/lib/systemd/system:/lib/systemd/system
-systemduserunitpath=${systemduserconfdir}:/etc/systemd/user:/run/systemd/user:/usr/local/lib/systemd/user:/usr/local/share/systemd/user:${systemduserunitdir}:/usr/lib/systemd/user:/usr/share/systemd/user
-systemdsystemgeneratordir=${rootprefix}/lib/systemd/system-generators
-systemdusergeneratordir=${prefix}/lib/systemd/user-generators
-systemdsystemgeneratorpath=/run/systemd/system-generators:/etc/systemd/system-generators:/usr/local/lib/systemd/system-generators:${systemdsystemgeneratordir}
-systemdusergeneratorpath=/run/systemd/user-generators:/etc/systemd/user-generators:/usr/local/lib/systemd/user-generators:${systemdusergeneratordir}
-systemdsleepdir=${rootprefix}/lib/systemd/system-sleep
-systemdshutdowndir=${rootprefix}/lib/systemd/system-shutdown
-tmpfilesdir=${prefix}/lib/tmpfiles.d
-sysusersdir=${prefix}/lib/sysusers.d
-sysctldir=${prefix}/lib/sysctl.d
-binfmtdir=${prefix}/lib/binfmt.d
-modulesloaddir=${prefix}/lib/modules-load.d
-catalogdir=${prefix}/lib/systemd/catalog
-systemuidmax=@systemuidmax@
-systemgidmax=@systemgidmax@
-dynamicuidmin=@dynamicuidmin@
-dynamicuidmax=@dynamicuidmax@
-containeruidbasemin=@containeruidbasemin@
-containeruidbasemax=@containeruidbasemax@
+root_prefix=@rootprefix_noslash@
+rootprefix=${root_prefix}
+sysconf_dir=@sysconfdir@
+sysconfdir=${sysconf_dir}
+
+systemd_util_dir=${root_prefix}/lib/systemd
+systemdutildir=${systemd_util_dir}
+
+systemd_system_unit_dir=${rootprefix}/lib/systemd/system
+systemdsystemunitdir=${systemd_system_unit_dir}
+
+systemd_system_preset_dir=${rootprefix}/lib/systemd/system-preset
+systemdsystempresetdir=${systemd_system_preset_dir}
+
+systemd_user_unit_dir=${prefix}/lib/systemd/user
+systemduserunitdir=${systemd_user_unit_dir}
+
+systemd_user_preset_dir=${prefix}/lib/systemd/user-preset
+systemduserpresetdir=${systemd_user_preset_dir}
+
+systemd_system_conf_dir=${sysconfdir}/systemd/system
+systemdsystemconfdir=${systemd_system_conf_dir}
+
+systemd_user_conf_dir=${sysconfdir}/systemd/user
+systemduserconfdir=${systemd_user_conf_dir}
+
+systemd_system_unit_path=${systemd_system_conf_dir}:/etc/systemd/system:/run/systemd/system:/usr/local/lib/systemd/system:${systemd_system_unit_dir}:/usr/lib/systemd/system:/lib/systemd/system
+systemdsystemunitpath=${systemd_system_unit_path}
+
+systemd_user_unit_path=${systemd_user_conf_dir}:/etc/systemd/user:/run/systemd/user:/usr/local/lib/systemd/user:/usr/local/share/systemd/user:${systemd_user_unit_dir}:/usr/lib/systemd/user:/usr/share/systemd/user
+systemduserunitpath=${systemd_user_unit_path}
+
+systemd_system_generator_dir=${root_prefix}/lib/systemd/system-generators
+systemdsystemgeneratordir=${systemd_system_generator_dir}
+
+systemd_user_generator_dir=${prefix}/lib/systemd/user-generators
+systemdusergeneratordir=${systemd_user_generator_dir}
+
+systemd_system_generator_path=/run/systemd/system-generators:/etc/systemd/system-generators:/usr/local/lib/systemd/system-generators:${systemd_system_generator_dir}
+systemdsystemgeneratorpath=${systemd_system_generator_path}
+
+systemd_user_generator_path=/run/systemd/user-generators:/etc/systemd/user-generators:/usr/local/lib/systemd/user-generators:${systemd_user_generator_dir}
+systemdusergeneratorpath=${systemd_user_generator_path}
+
+systemd_sleep_dir=${root_prefix}/lib/systemd/system-sleep
+systemdsleepdir=${systemd_sleep_dir}
+
+systemd_shutdown_dir=${root_prefix}/lib/systemd/system-shutdown
+systemdshutdowndir=${systemd_shutdown_dir}
+
+tmpfiles_dir=${prefix}/lib/tmpfiles.d
+tmpfilesdir=${tmpfiles_dir}
+
+sysusers_dir=${prefix}/lib/sysusers.d
+sysusersdir=${sysusers_dir}
+
+sysctl_dir=${prefix}/lib/sysctl.d
+sysctldir=${sysctl_dir}
+
+binfmt_dir=${prefix}/lib/binfmt.d
+binfmtdir=${binfmt_dir}
+
+modules_load_dir=${prefix}/lib/modules-load.d
+modulesloaddir=${modules_load_dir}
+
+catalog_dir=${prefix}/lib/systemd/catalog
+catalogdir=${catalog_dir}
+
+system_uid_max=@systemuidmax@
+systemuidmax=${system_uid_max}
+system_gid_max=@systemgidmax@
+systemgidmax=${system_gid_max}
+
+dynamic_uid_min=@dynamicuidmin@
+dynamicuidmin=${dynamic_uid_min}
+dynamic_uid_max=@dynamicuidmax@
+dynamicuidmax=${dynamic_uid_max}
+
+container_uid_base_min=@containeruidbasemin@
+containeruidbasemin=${container_uid_base_min}
+container_uid_base_max=@containeruidbasemax@
+containeruidbasemax=${container_uid_base_max}
 
 Name: systemd
 Description: systemd System and Service Manager

src/udev/udev.pc.in

@@ -2,4 +2,5 @@ Name: udev
 Description: udev
 Version: @PROJECT_VERSION@
 
-udevdir=@udevlibexecdir@
+udev_dir=@udevlibexecdir@
+udevdir=${udev_dir}