meson: allow optional static linking of shared code in udev helpers

This makes the helper binaries significantly bigger (in some cases, the final
size depends on link options and optimization level), and is only useful for
distributions which want to provide the option to install udev without systemd.
As the linking is improved, the difference between the columns might shrink,
but it's unlikely that linking libshared statically could ever be more
efficient.

E.g. with -O0, no -flto:
                   (static) (shared)
src/udev/ata_id     999176    85696
src/udev/cdrom_id  1024344   111656
src/udev/collect    990344    81280
src/udev/scsi_id   1023592   115656
src/udev/v4l_id     811736    17744

When linked dynamically, install_rpath must be specified, so add that.

4 files changed, 40 insertions, 58 deletions

diff --git a/meson.build b/meson.build
index 6fca0b0932..9504e984ec 100644
--- a/meson.build
+++ b/meson.build
@@ -2018,7 +2018,8 @@ exe = executable('systemd-udevd',
                               libudev_internal,
                               libsystemd_network,
                               libshared],
-                 dependencies : [libkmod,
+                 dependencies : [threads,
+                                 libkmod,
                                  libidn,
                                  libacl,
                                  libblkid],
@@ -2034,7 +2035,8 @@ exe = executable('udevadm',
                               libudev_internal,
                               libsystemd_network,
                               libshared],
-                 dependencies : [libkmod,
+                 dependencies : [threads,
+                                 libkmod,
                                  libidn,
                                  libacl,
                                  libblkid],
diff --git a/meson_options.txt b/meson_options.txt
index 9caf9a329f..132c05ab56 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -6,6 +6,8 @@ option('rootlibdir', type : 'string',
        description : '''[/usr]/lib/x86_64-linux-gnu or such''')
 option('rootprefix', type : 'string',
        description : '''override the root prefix''')
+option('link-udev-shared', type : 'boolean',
+       description : 'link systemd-udev and its helpers to libsystemd-shared.so')
 
 option('sysvinit-path', type : 'string', value : '/etc/init.d',
        description : 'the directory where the SysV init scripts are located')
diff --git a/src/test/meson.build b/src/test/meson.build
index 59a51d857e..0014fed79b 100644
--- a/src/test/meson.build
+++ b/src/test/meson.build
@@ -575,7 +575,8 @@ tests += [
     libudev_internal,
     libsystemd_network,
     libshared],
-   [librt,
+   [threads,
+    librt,
     libblkid,
     libkmod,
     libacl],
diff --git a/src/udev/meson.build b/src/udev/meson.build
index e7feaedb4f..1eac8754eb 100644
--- a/src/udev/meson.build
+++ b/src/udev/meson.build
@@ -92,11 +92,20 @@ link_config_gperf_c = custom_target(
 
 ############################################################
 
+if get_option('link-udev-shared')
+  libudev_link_with = [libshared]
+  rpath = rootlibexecdir
+else
+  libudev_link_with = [libshared_static,
+                       libsystemd_internal]
+  rpath = ''
+endif
+
 libudev_internal = static_library(
     'udev',
     libudev_sources,
     include_directories : includes,
-    link_with : [libshared])
+    link_with : libudev_link_with)
 
 libudev_core_includes = [includes, include_directories('net')]
 libudev_core = static_library(
@@ -105,60 +114,28 @@ libudev_core = static_library(
     link_config_gperf_c,
     keyboard_keys_from_name_h,
     include_directories : libudev_core_includes,
-    link_with : [libshared])
-
-executable('ata_id',
-           'ata_id/ata_id.c',
-           include_directories : includes,
-           link_with : [libudev_internal,
-                        libshared],
-           install : true,
-           install_dir : udevlibexecdir)
-
-executable('cdrom_id',
-           'cdrom_id/cdrom_id.c',
-           include_directories : includes,
-           link_with : [libudev_internal,
-                        libshared],
-           install : true,
-           install_dir : udevlibexecdir)
-
-executable('collect',
-           'collect/collect.c',
-           include_directories : includes,
-           link_with : [libudev_internal,
-                        libshared],
-           install : true,
-           install_dir : udevlibexecdir)
-
-executable('scsi_id',
-           'scsi_id/scsi_id.c',
-           'scsi_id/scsi_id.h',
-           'scsi_id/scsi_serial.c',
-           'scsi_id/scsi.h',
-           include_directories : includes,
-           link_with : [libudev_internal,
-                        libshared],
-           install : true,
-           install_dir : udevlibexecdir)
-
-executable('v4l_id',
-           'v4l_id/v4l_id.c',
-           include_directories : includes,
-           link_with : [libudev_internal,
-                        libshared],
-           install : true,
-           install_dir : udevlibexecdir)
-
-executable('mtd_probe',
-           'mtd_probe/mtd_probe.c',
-           'mtd_probe/mtd_probe.h',
-           'mtd_probe/probe_smartmedia.c',
-           include_directories : includes,
-           link_with : [libudev_internal,
-                        libshared],
-           install : true,
-           install_dir : udevlibexecdir)
+    link_with : libudev_link_with)
+
+foreach prog : [['ata_id/ata_id.c'],
+                ['cdrom_id/cdrom_id.c'],
+                ['collect/collect.c'],
+                ['scsi_id/scsi_id.c',
+                 'scsi_id/scsi_id.h',
+                 'scsi_id/scsi_serial.c',
+                 'scsi_id/scsi.h'],
+                ['v4l_id/v4l_id.c'],
+                ['mtd_probe/mtd_probe.c',
+                 'mtd_probe/mtd_probe.h',
+                 'mtd_probe/probe_smartmedia.c']]
+
+  executable(prog[0].split('/')[0],
+             prog,
+             include_directories : includes,
+             link_with : [libudev_internal],
+             install_rpath : rpath,
+             install : true,
+             install_dir : udevlibexecdir)
+endforeach
 
 install_data('udev.conf',
              install_dir : join_paths(sysconfdir, 'udev'))