[gtk/build-fix: 3/3] build: Collect gi-docgen's common arguments

[Emmanuele Bassi <ebassi src gnome org>]

commit 142571d0b871962bedbff09a0b3ed7fbd64701e2
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Nov 1 13:00:51 2021 +0000

    build: Collect gi-docgen's common arguments
    
    And only enable `--fatal-warnings` if `-Dwerror` has been set, just like
    we do for the introspection data generation.

 docs/reference/gdk/meson.build | 12 +++---------
 docs/reference/gsk/meson.build |  4 +---
 docs/reference/gtk/meson.build |  4 +---
 docs/reference/meson.build     |  9 +++++++++
 4 files changed, 14 insertions(+), 15 deletions(-)
---
diff --git a/docs/reference/gdk/meson.build b/docs/reference/gdk/meson.build
index 57da47f5f1..9a38c618d6 100644
--- a/docs/reference/gdk/meson.build
+++ b/docs/reference/gdk/meson.build
@@ -16,12 +16,10 @@ if get_option('gtk_doc')
     command: [
       gidocgen,
       'generate',
-      '--quiet',
-      '--fatal-warnings',
+      gidocgen_common_args,
       '--add-include-path=@0@'.format(meson.current_build_dir() / '../../../gtk'),
       '--config=@INPUT0@',
       '--output-dir=@OUTPUT@',
-      '--no-namespace-dir',
       '--content-dir=@0@'.format(meson.current_source_dir()),
       '@INPUT1@',
     ],
@@ -46,12 +44,10 @@ if get_option('gtk_doc')
       command: [
         gidocgen,
         'generate',
-        '--quiet',
-        '--fatal-warnings',
+        gidocgen_common_args,
         '--add-include-path=@0@'.format(meson.current_build_dir() / '../../../gtk'),
         '--config=@INPUT0@',
         '--output-dir=@OUTPUT@',
-        '--no-namespace-dir',
         '--content-dir=@0@'.format(meson.current_source_dir()),
         '@INPUT1@',
       ],
@@ -78,12 +74,10 @@ if get_option('gtk_doc')
       command: [
         gidocgen,
         'generate',
-        '--quiet',
-        '--fatal-warnings',
+        gidocgen_common_args,
         '--add-include-path=@0@'.format(meson.current_build_dir() / '../../../gtk'),
         '--config=@INPUT0@',
         '--output-dir=@OUTPUT@',
-        '--no-namespace-dir',
         '--content-dir=@0@'.format(meson.current_source_dir()),
         '@INPUT1@',
       ],
diff --git a/docs/reference/gsk/meson.build b/docs/reference/gsk/meson.build
index 13f636091d..abb30381e6 100644
--- a/docs/reference/gsk/meson.build
+++ b/docs/reference/gsk/meson.build
@@ -13,12 +13,10 @@ if get_option('gtk_doc')
     command: [
       gidocgen,
       'generate',
-      '--quiet',
-      '--fatal-warnings',
+      gidocgen_common_args,
       '--add-include-path=@0@'.format(meson.current_build_dir() / '../../../gtk'),
       '--config=@INPUT0@',
       '--output-dir=@OUTPUT@',
-      '--no-namespace-dir',
       '--content-dir=@0@'.format(meson.current_source_dir()),
       '@INPUT1@',
     ],
diff --git a/docs/reference/gtk/meson.build b/docs/reference/gtk/meson.build
index 7ae01f0451..441207c2b2 100644
--- a/docs/reference/gtk/meson.build
+++ b/docs/reference/gtk/meson.build
@@ -42,12 +42,10 @@ if get_option('gtk_doc')
     command: [
       gidocgen,
       'generate',
-      '--quiet',
-      '--fatal-warnings',
+      gidocgen_common_args,
       '--add-include-path=@0@'.format(meson.current_build_dir() / '../../../gtk'),
       '--config=@INPUT0@',
       '--output-dir=@OUTPUT@',
-      '--no-namespace-dir',
       '--content-dir=@0@'.format(meson.current_source_dir()),
       '@INPUT1@',
     ],
diff --git a/docs/reference/meson.build b/docs/reference/meson.build
index 4ca44b67e8..df5e3d9909 100644
--- a/docs/reference/meson.build
+++ b/docs/reference/meson.build
@@ -3,6 +3,15 @@ toml_conf.set('version', meson.project_version())
 
 gidocgen = find_program('gi-docgen', required: get_option('gtk_doc'))
 
+gidocgen_common_args = [
+  '--quiet',
+  '--no-namespace-dir',
+]
+
+if get_option('werror')
+  gidocgen_common_args += ['--fatal-warnings']
+endif
+
 docs_dir = gtk_datadir / 'doc'
 
 if get_option('gtk_doc') and not build_gir