docs: Allow building man pages without the reference documentation

Now that the reference documentation uses gi-docgen, it's more
troublesome to generate in less standard build scenarios like
cross-compiling.

In distributions like Debian, reference documentation is generally
packaged separately (in libglib2.0-doc in Debian's case), but man pages
are generally packaged alongside the executables themselves (in the
libglib2.0-bin and libglib2.0-dev-bin packages, in Debian's case). We
can exclude the reference documentation when cross-compiling, but ideally
we would like the man pages to still be built, so that a cross-compiled
libglib2.0-bin or libglib2.0-dev-bin package has the same content as a
native build.

Signed-off-by: Simon McVittie <smcv@debian.org>

docs/reference/gio/meson.build

@@ -19,6 +19,7 @@ if get_option('man-pages').enabled()
   endforeach
 endif
 
+if get_option('documentation') and enable_gir
   expand_content_files = [
     'dbus-error.md',
     'dbus-introspection.md',
@@ -60,3 +61,4 @@ custom_target('gio-docs',
     install_dir: docs_dir,
     install_tag: 'doc',
   )
+endif

docs/reference/girepository/meson.build

@@ -1,3 +1,4 @@
+if get_option('documentation') and enable_gir
   girepository_toml = configure_file(
     input: 'girepository.toml.in',
     output: 'girepository.toml',
@@ -21,3 +22,4 @@ custom_target('girepository-docs',
     ],
     build_by_default: true,
   )
+endif

docs/reference/glib/meson.build

@@ -53,6 +53,7 @@ if get_option('documentation')
   endif
 endif
 
+if get_option('documentation') and enable_gir
   expand_content_files = [
     'atomic.md',
     'base64.md',
@@ -117,3 +118,4 @@ custom_target('glib-docs',
     install_dir: docs_dir,
     install_tag: 'doc',
   )
+endif

docs/reference/gmodule/meson.build

@@ -1,3 +1,4 @@
+if get_option('documentation') and enable_gir
   expand_content_files = [
     'modules.md',
   ]
@@ -22,3 +23,4 @@ custom_target('gmodule-docs',
     install_dir: docs_dir,
     install_tag: 'doc',
   )
+endif

docs/reference/gobject/meson.build

@@ -17,6 +17,7 @@ if get_option('man-pages').enabled()
   endforeach
 endif
 
+if get_option('documentation') and enable_gir
   expand_content_files = [
     'boxed.md',
     'concepts.md',
@@ -49,3 +50,4 @@ custom_target('gobject-docs',
     install_dir: docs_dir,
     install_tag: 'doc',
   )
+endif

docs/reference/meson.build

@@ -16,10 +16,10 @@ if get_option('documentation') and enable_gir
   ]
 
   docs_dir = glib_datadir / 'doc' / 'glib-2.0'
+endif
 
 subdir('glib')
 subdir('gmodule')
 subdir('gobject')
 subdir('gio')
 subdir('girepository')
-endif