meson: make it possible to set the path for eldbus-codegen

find_program() did not detect the eldbus-codegen binary in a given
prefix. Which is a situation we have on Jenkins builds. Make it an
option that can be set like we already do with edje_cc.
If there is a more meson-like approach to this I do not know feel free
to enlight me.

meson.build

@@ -320,7 +320,11 @@ if dep_xkeyboard_config.found() == true
   config_h.set_quoted('XKB_BASE', dep_xkeyboard_config.get_pkgconfig_variable('xkb_base'))
 endif
 
-eldbus_codegen = find_program('eldbus-codegen')
+eldbus_codegen_cmd = get_option('eldbus-codegen')
+if eldbus_codegen_cmd == ''
+  eldbus_codegen_cmd = join_paths(dep_eldbus.get_pkgconfig_variable('prefix'),
+                        'bin', 'eldbus-codegen')
+endif
 
 requires_e = []
 

meson_options.txt

@@ -19,6 +19,10 @@ option('edje-cc',
        type       : 'string',
        description: 'A path to a edje_cc. Defaults to system edje_cc')
 
+option('eldbus-codegen',
+       type       : 'string',
+       description: 'A path to a eldbus-codegen. Defaults to system eldbus-codegen')
+
 option('pam',
 	type: 'boolean',
 	value: true,

src/modules/geolocation/meson.build

@@ -14,6 +14,6 @@ src = files(
 
 src += custom_target('geolocation_gen',
                      input  : 'org.freedesktop.GeoClue2.xml',
-                     command: [eldbus_codegen, '@INPUT@', '-O', '@OUTDIR@'],
+                     command: [eldbus_codegen_cmd, '@INPUT@', '-O', '@OUTDIR@'],
                      output : created_file
                     )

src/modules/music-control/meson.build

@@ -15,6 +15,6 @@ src = files(
 
 src += custom_target('gen-dbus',
                      input  : 'introspect.xml',
-                     command: [eldbus_codegen, '@INPUT@', '-O', '@OUTDIR@'],
+                     command: [eldbus_codegen_cmd, '@INPUT@', '-O', '@OUTDIR@'],
                      output : created_file
                     )