build-sys: create "compatibility libraries" section

Compat stuff is moved to src/compat-libs/.
Warnings are issued when programs are linked with the deprecated library.

4 files changed, 140 insertions, 0 deletions

diff --git a/src/compat-libs/.gitignore b/src/compat-libs/.gitignore
new file mode 100644
index 0000000000..0b8d1067d9
--- /dev/null
+++ b/src/compat-libs/.gitignore
@@ -0,0 +1 @@
+/libsystemd-login.pc
diff --git a/src/compat-libs/libsystemd-login.pc.in b/src/compat-libs/libsystemd-login.pc.in
new file mode 100644
index 0000000000..677f6b6681
--- /dev/null
+++ b/src/compat-libs/libsystemd-login.pc.in
@@ -0,0 +1,18 @@
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: systemd
+Description: systemd Login Utility Library deprecated compatibility library
+URL: @PACKAGE_URL@
+Version: @PACKAGE_VERSION@
+Libs: -L${libdir} -lsystemd
+Cflags: -I${includedir}
diff --git a/src/compat-libs/libsystemd-login.sym b/src/compat-libs/libsystemd-login.sym
new file mode 100644
index 0000000000..54aa91c609
--- /dev/null
+++ b/src/compat-libs/libsystemd-login.sym
@@ -0,0 +1,87 @@
+/***
+  This file is part of systemd.
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+***/
+
+/* Original symbols from systemd v31 */
+
+LIBSYSTEMD_LOGIN_31 {
+global:
+        sd_get_seats;
+        sd_get_sessions;
+        sd_get_uids;
+        sd_login_monitor_flush;
+        sd_login_monitor_get_fd;
+        sd_login_monitor_new;
+        sd_login_monitor_unref;
+        sd_pid_get_owner_uid;
+        sd_pid_get_session;
+        sd_seat_can_multi_session;
+        sd_seat_get_active;
+        sd_seat_get_sessions;
+        sd_session_get_seat;
+        sd_session_get_uid;
+        sd_session_is_active;
+        sd_uid_get_seats;
+        sd_uid_get_sessions;
+        sd_uid_get_state;
+        sd_uid_is_on_seat;
+local:
+        *;
+};
+
+LIBSYSTEMD_LOGIN_38 {
+global:
+        sd_pid_get_unit;
+        sd_session_get_service;
+} LIBSYSTEMD_LOGIN_31;
+
+LIBSYSTEMD_LOGIN_43 {
+global:
+        sd_session_get_type;
+        sd_session_get_class;
+        sd_session_get_display;
+} LIBSYSTEMD_LOGIN_38;
+
+LIBSYSTEMD_LOGIN_186 {
+global:
+        sd_session_get_state;
+        sd_seat_can_tty;
+        sd_seat_can_graphical;
+} LIBSYSTEMD_LOGIN_43;
+
+LIBSYSTEMD_LOGIN_198 {
+global:
+        sd_session_get_tty;
+} LIBSYSTEMD_LOGIN_186;
+
+LIBSYSTEMD_LOGIN_201 {
+global:
+        sd_login_monitor_get_events;
+        sd_login_monitor_get_timeout;
+} LIBSYSTEMD_LOGIN_198;
+
+LIBSYSTEMD_LOGIN_202 {
+global:
+        sd_pid_get_user_unit;
+        sd_pid_get_machine_name;
+} LIBSYSTEMD_LOGIN_201;
+
+LIBSYSTEMD_LOGIN_203 {
+global:
+        sd_get_machine_names;
+} LIBSYSTEMD_LOGIN_202;
+
+LIBSYSTEMD_LOGIN_205 {
+global:
+        sd_pid_get_slice;
+} LIBSYSTEMD_LOGIN_203;
+
+LIBSYSTEMD_LOGIN_207 {
+global:
+        sd_session_get_vt;
+} LIBSYSTEMD_LOGIN_205;
diff --git a/src/compat-libs/linkwarning.h b/src/compat-libs/linkwarning.h
new file mode 100644
index 0000000000..b6a6ac2940
--- /dev/null
+++ b/src/compat-libs/linkwarning.h
@@ -0,0 +1,34 @@
+/***
+  This file is part of systemd, but is heavily based on
+  glibc's libc-symbols.h.
+
+  Copyright (C) 1995-1998,2000-2006,2008,2009 Free Software Foundation, Inc
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+
+#define __make_section_unallocated(section_string)      \
+  asm (".section " section_string "\n\t.previous");
+
+#define __sec_comment "\n#APP\n\t#"
+
+#define link_warning(symbol, msg) \
+  __make_section_unallocated (".gnu.warning." #symbol)  \
+  static const char __evoke_link_warning_##symbol[]     \
+    __attribute__ ((used, section (".gnu.warning." #symbol __sec_comment))) \
+    = msg
+
+#define obsolete_lib(name, lib)                         \
+  link_warning(name, #name " was moved to libsystemd. Do not use " #lib ".")