[atkmm/atkmm-2-28] Fix build as subproject without building documentation



commit 51ad7bfa3699d48c12243de5ecbadb0bc824d188
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Fri May 14 15:44:51 2021 +0200

    Fix build as subproject without building documentation
    
    * meson.build: If mm-common-get is not found in maintainer-mode
    with 'required: false', try with 'required: true'.
    Don't try to use tag_file, if documentation is not built.
    * doc/reference/meson.build: Don't use variables from modules
    that don't define doxytagfile. These are subprojects that don't build
    their documentation.

 doc/reference/meson.build | 34 ++++++++++++++++++----------------
 meson.build               | 21 ++++++++++++++-------
 2 files changed, 32 insertions(+), 23 deletions(-)
---
diff --git a/doc/reference/meson.build b/doc/reference/meson.build
index b14cf56..c74f6c9 100644
--- a/doc/reference/meson.build
+++ b/doc/reference/meson.build
@@ -3,7 +3,7 @@
 # Input: built_files_root, project_source_root, atkmm_pcname, hg_ccg_basenames,
 #        extra_h_files, built_h_file_targets, install_datadir, python3,
 #        doc_reference_py, can_add_dist_script
-# Output: install_docdir, install_devhelpdir, tag_file
+# Output: install_docdir, install_devhelpdir, if build_documentation: tag_file
 
 tag_file_modules = [
   'mm-common-libstdc++',
@@ -15,21 +15,23 @@ docinstall_flags = []
 foreach module : tag_file_modules
   depmod = dependency(module, required: false)
   if depmod.found()
-    doxytagfile = depmod.get_variable(pkgconfig: 'doxytagfile', internal: 'doxytagfile')
-    htmlrefpub = depmod.get_variable(pkgconfig: 'htmlrefpub', internal: 'htmlrefpub', default_value: '')
-    htmlrefdir = depmod.get_variable(pkgconfig: 'htmlrefdir', internal: 'htmlrefdir', default_value: '')
-    if htmlrefpub == ''
-      htmlrefpub = htmlrefdir
-    elif htmlrefdir == ''
-      htmlrefdir = htmlrefpub
-    endif
-    doxygen_tagfiles += ' "' + doxytagfile + '=' + htmlrefpub + '"'
-
-    # Doxygen <= 1.8.15
-    docinstall_flags += ['-l', doxytagfile.split('/')[-1] + '@' + htmlrefdir]
-    if htmlrefpub != htmlrefdir
-      # Doxygen >= 1.8.16
-      docinstall_flags += ['-l', 's@' + htmlrefpub + '@' + htmlrefdir]
+    doxytagfile = depmod.get_variable(pkgconfig: 'doxytagfile', internal: 'doxytagfile', default_value: '')
+    if doxytagfile != ''
+      htmlrefpub = depmod.get_variable(pkgconfig: 'htmlrefpub', internal: 'htmlrefpub', default_value: '')
+      htmlrefdir = depmod.get_variable(pkgconfig: 'htmlrefdir', internal: 'htmlrefdir', default_value: '')
+      if htmlrefpub == ''
+        htmlrefpub = htmlrefdir
+      elif htmlrefdir == ''
+        htmlrefdir = htmlrefpub
+      endif
+      doxygen_tagfiles += ' "' + doxytagfile + '=' + htmlrefpub + '"'
+
+      # Doxygen <= 1.8.15
+      docinstall_flags += ['-l', doxytagfile.split('/')[-1] + '@' + htmlrefdir]
+      if htmlrefpub != htmlrefdir
+        # Doxygen >= 1.8.16
+        docinstall_flags += ['-l', 's@' + htmlrefpub + '@' + htmlrefdir]
+      endif
     endif
   endif
 endforeach
diff --git a/meson.build b/meson.build
index 03e43d1..2afa933 100644
--- a/meson.build
+++ b/meson.build
@@ -130,7 +130,11 @@ atkmm_requires = ' '.join([
 # reference documentation shall be built.
 mm_common_get = find_program('mm-common-get', required: false)
 if maintainer_mode and not mm_common_get.found()
-  error('mm-common-get not found. mm-common >= 1.0.0 is required.')
+  message('Maintainer mode requires the \'mm-common-get\' command. If it is not found,\n' +
+          'install the \'mm-common\' package, version 1.0.0 or higher.')
+  # If meson --wrap-mode != forcefallback, Meson falls back to the mm-common
+  # subproject only if mm-common-get is required.
+  mm_common_get = find_program('mm-common-get', required: true)
 endif
 m4 = find_program('m4', required: maintainer_mode) # Used by gmmproc (in glibmm)
 perl = find_program('perl', required: maintainer_mode or build_documentation)
@@ -273,14 +277,17 @@ if can_add_dist_script
 endif
 
 if meson.is_subproject()
+  pkgconfig_vars = {
+    'gmmprocm4dir': project_source_root / 'codegen' / 'm4',
+    'htmlrefdir': install_prefix / install_docdir / 'reference' / 'html',
+    'htmlrefpub': 'http://library.gnome.org/devel/' + pkg_conf_data.get_unquoted('PACKAGE_TARNAME') + 
'/unstable/'
+  }
+  if build_documentation
+    pkgconfig_vars += {'doxytagfile': tag_file.full_path()}
+  endif
   atkmm_dep = declare_dependency(
     dependencies: atkmm_own_dep,
-    variables: {
-      'gmmprocm4dir': project_source_root / 'codegen' / 'm4',
-      'doxytagfile': tag_file.full_path(),
-      'htmlrefdir': install_prefix / install_docdir / 'reference' / 'html',
-      'htmlrefpub': 'http://library.gnome.org/devel/' + pkg_conf_data.get_unquoted('PACKAGE_TARNAME') + 
'/unstable/'
-    }
+    variables: pkgconfig_vars,
   )
 
   # A main project that looks for atkmm_pcname.pc shall find atkmm_dep.


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