[gnome-online-accounts] examples can be compiled even if !enable_goabackend

[Emmanuele Bassi <ebassi src gnome org>]

commit 67c4eed60a5a7defead2f3d001ebe6d8b2f8305e
Author: Paolo Bonzini <pbonzini redhat com>
Date:   Thu May 19 08:58:53 2022 +0200

    examples can be compiled even if !enable_goabackend
    
    This also means searching for librest even if !enable_goabackend.  However,
    in that case the build can proceed without the library and only the example
    that uses it is removed.

 meson.build              | 11 ++++++-----
 src/examples/meson.build |  5 +++--
 src/meson.build          |  3 ++-
 3 files changed, 11 insertions(+), 8 deletions(-)
---
diff --git a/meson.build b/meson.build
index dddfc4a3..f2171414 100644
--- a/meson.build
+++ b/meson.build
@@ -102,13 +102,14 @@ if enable_goabackend
   libsecret_dep = dependency('libsecret-1')
   libsoup_dep = dependency('libsoup-3.0', version: '>= 3.0', fallback: ['libsoup'])
   libxml_dep = dependency('libxml-2.0')
-  rest_dep = dependency('rest-1.0',
-    version: '>= 0.9.0',
-    fallback: ['librest', 'librest_dep'],
-    default_options: ['soup2=false', 'examples=false', 'tests=false', 'gtk_doc=false'],
-  )
   webkit_gtk_dep = dependency('webkit2gtk-4.1', version: '>= 2.33.1')
 endif
+rest_dep = dependency('rest-1.0',
+  version: '>= 0.9.0',
+  fallback: ['librest', 'librest_dep'],
+  required: enable_goabackend,
+  default_options: ['soup2=false', 'examples=false', 'tests=false', 'gtk_doc=false'],
+)
 config_h.set('GOA_BACKEND_ENABLED', enable_goabackend)
 
 enable_inspector = get_option('inspector')
diff --git a/src/examples/meson.build b/src/examples/meson.build
index 3c2d1818..cef3062e 100644
--- a/src/examples/meson.build
+++ b/src/examples/meson.build
@@ -1,9 +1,10 @@
 programs = [
   # program name, deps
   ['list-accounts', libgoa_dep],
-  ['lastfm-shout', [libgoa_dep, rest_dep]]
 ]
-
+if rest_dep.found()
+  ['lastfm-shout', [libgoa_dep, rest_dep]]
+endif
 if enable_goabackend
   programs += [
     ['introspect-providers', libgoa_backend_dep],
diff --git a/src/meson.build b/src/meson.build
index d9a5d656..a87e282e 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -11,5 +11,6 @@ if enable_goabackend
 
   subdir('goabackend')
   subdir('daemon')
-  subdir('examples')
 endif
+
+subdir('examples')