[gtk-vnc] meson: Make introspection building controllable

[Daniel P. Berrange <dberrange src gnome org>]

commit 974c78f2ecab70986a83abc0d279d9d2d42c988c
Author: Mart Raudsepp <leio gentoo org>
Date:   Sat Apr 4 22:55:36 2020 +0300

    meson: Make introspection building controllable
    
    The windows host checks are removed, as I don't think it's inherently
    impossible to build with introspection for windows, and if a
    particular windows build needs it disabled, it's controllable via
    the option now.
    Vala API build requires introspection - this is made explicit to
    not end up with missing vapi files, despite asking for them.

 meson.build       | 4 ++++
 meson_options.txt | 1 +
 src/meson.build   | 6 +++---
 3 files changed, 8 insertions(+), 3 deletions(-)
---
diff --git a/meson.build b/meson.build
index d34ca0c..79ebb2d 100644
--- a/meson.build
+++ b/meson.build
@@ -280,7 +280,11 @@ configure_file(
 top_incdir = include_directories('.')
 src_incdir = include_directories('src')
 
+with_gir = get_option('introspection')
 with_vala = get_option('with-vala')
+if with_vala and not with_gir
+  error('Vala API requires GObject introspection (-Dintrospection=true)')
+endif
 
 subdir('src')
 subdir('tools')
diff --git a/meson_options.txt b/meson_options.txt
index 3f9b996..f180eab 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,3 +1,4 @@
+option('introspection', type: 'boolean', value: true, description: 'Enable introspection for this build')
 option('pulseaudio', type: 'feature', value: 'auto', description: 'Build the pulseaudio bridge for VNC 
client connections')
 option('sasl', type: 'feature', value: 'auto', description: 'Build with SASL support')
 option('with-coroutine', type: 'string', value: 'auto', description: 'Build with coroutine backend: [auto, 
ucontext, gthread]')
diff --git a/src/meson.build b/src/meson.build
index 64f7439..461d8d2 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -135,7 +135,7 @@ gvnc_dep = declare_dependency(
   include_directories: gvnc_inc,
 )
 
-if host_machine.system() != 'windows'
+if with_gir
   gvnc_gir = gnome.generate_gir(
     gvnc,
     sources: gvnc_gir_sources,
@@ -218,7 +218,7 @@ if libpulse_dep.found()
     include_directories: gvncpulse_inc,
   )
 
-  if host_machine.system() != 'windows'
+  if with_gir
     gvncpulse_gir = gnome.generate_gir(
       gvncpulse,
       sources: gvncpulse_sources,
@@ -382,7 +382,7 @@ gtk_vnc_dep = declare_dependency(
   include_directories: gtk_vnc_inc,
 )
 
-if host_machine.system() != 'windows'
+if with_gir
   gtk_vnc_gir = gnome.generate_gir(
     gtk_vnc,
     sources: gtk_vnc_gir_sources,