[rygel] build: Add option to disable introspection

[Jens Georg <jensgeorg src gnome org>]

commit 13e45f94860461cadca89f2088bad65b5730bee8
Author: Jens Georg <mail jensge org>
Date:   Fri Aug 23 18:29:16 2019 +0200

    build: Add option to disable introspection
    
    Fixes #143

 meson.build                           | 2 +-
 meson_options.txt                     | 1 +
 src/librygel-core/meson.build         | 2 ++
 src/librygel-renderer-gst/meson.build | 2 ++
 src/librygel-renderer/meson.build     | 2 ++
 src/librygel-server/meson.build       | 4 +++-
 6 files changed, 11 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 85573e6c..4c8e4a9f 100644
--- a/meson.build
+++ b/meson.build
@@ -110,7 +110,7 @@ endif
 posix = vala.find_library('posix')
 
 sed = find_program('sed')
-g_ir_compiler = find_program('g-ir-compiler')
+g_ir_compiler = find_program('g-ir-compiler', required: get_option('introspection'))
 gir_dir = join_paths(get_option('datadir'), 'gir-1.0')
 typelib_dir = join_paths(get_option('libdir'), 'girepository-1.0')
 pkgconfig_dir = join_paths(get_option('libdir'), 'pkgconfig')
diff --git a/meson_options.txt b/meson_options.txt
index f09cac58..b987ee51 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -7,3 +7,4 @@ option('examples', type : 'boolean', value : 'true')
 option('tests', type : 'boolean', value : 'true')
 option('gstreamer', type : 'boolean', value : 'true')
 option('gtk', type : 'boolean', value : 'true')
+option('introspection', type: 'feature', value : 'auto')
diff --git a/src/librygel-core/meson.build b/src/librygel-core/meson.build
index 048ac35d..191c57f6 100644
--- a/src/librygel-core/meson.build
+++ b/src/librygel-core/meson.build
@@ -49,6 +49,7 @@ core_lib = library('rygel-core-2.6', core_sources,
         install_dir : [true, rygel_includedir, true, false])
 install_data('rygel-core-2.6.deps', install_dir : rygel_vapidir)
 
+if g_ir_compiler.found()
 # Step two: Do the namespace magic with sed
 # We cannot use input: here since the generated ninja build file does not seem
 # to know that Rygel-2.6.gir is a result of building rygel-core-2.6 target
@@ -74,6 +75,7 @@ custom_target('RygelCore-2.6.typelib',
                depends: core_gir,
                install: true,
                install_dir: typelib_dir)
+endif
 
 # need to add to get the current build dir as include dir
 rygel_core = declare_dependency(include_directories: include_directories('.'),
diff --git a/src/librygel-renderer-gst/meson.build b/src/librygel-renderer-gst/meson.build
index 4feaa83f..45f68cde 100644
--- a/src/librygel-renderer-gst/meson.build
+++ b/src/librygel-renderer-gst/meson.build
@@ -13,6 +13,7 @@ renderer_gst_lib = library('rygel-renderer-gst-2.6', renderer_gst_sources,
         install_dir : [true, rygel_includedir, true, false])
 install_data('rygel-renderer-gst-2.6.deps', install_dir : rygel_vapidir)
 
+if g_ir_compiler.found()
 # For details on the GIR/typelib generating process, see
 # librygel-core/meson.build
 renderer_gst_gir = custom_target('RygelRendererGst-2.6.gir',
@@ -40,6 +41,7 @@ custom_target('RygelRendererGst-2.6.typelib',
                depends: [renderer_gst_lib, renderer_lib, renderer_gst_gir],
                install: true,
                install_dir: typelib_dir)
+endif
 
 rygel_renderer_gst = declare_dependency(include_directories : include_directories('.'),
                                         dependencies : renderer_gst_deps,
diff --git a/src/librygel-renderer/meson.build b/src/librygel-renderer/meson.build
index 37d46b46..742c50f3 100644
--- a/src/librygel-renderer/meson.build
+++ b/src/librygel-renderer/meson.build
@@ -22,6 +22,7 @@ renderer_lib = library('rygel-renderer-2.6', renderer_sources,
         install_dir : [true, rygel_includedir, true, false])
 install_data('rygel-renderer-2.6.deps', install_dir : rygel_vapidir)
 
+if g_ir_compiler.found()
 # For details on the GIR / typelib generation process, see
 # librygel-core/meson.build
 renderer_gir = custom_target('RygelRenderer-2.6.gir',
@@ -47,6 +48,7 @@ custom_target('RygelRenderer-2.6.typelib',
                depends: renderer_gir,
                install: true,
                install_dir: typelib_dir)
+endif
 
 
 rygel_renderer = declare_dependency(include_directories : include_directories('.'),
diff --git a/src/librygel-server/meson.build b/src/librygel-server/meson.build
index 66a75698..5f5a1f06 100644
--- a/src/librygel-server/meson.build
+++ b/src/librygel-server/meson.build
@@ -99,7 +99,7 @@ server_lib = library('rygel-server-2.6', server_sources,
         install_dir : [true, rygel_includedir, true, false])
 install_data('rygel-server-2.6.deps', install_dir : rygel_vapidir)
 
-
+if g_ir_compiler.found()
 # For details on the GIR/typelib generation process, see
 # librygel-core/meson.build
 server_gir = custom_target('RygelServer-2.6.gir',
@@ -128,6 +128,8 @@ custom_target('RygelServer-2.6.typelib',
                install: true,
                install_dir: typelib_dir)
 
+endif
+
 # need to add to get the current build dir as include dir
 rygel_server = declare_dependency(include_directories: include_directories('.'),
                                   dependencies : server_deps,