From 554d6589d37773299e7868dcb177b0442241dbe7 Mon Sep 17 00:00:00 2001
From: Marko Lindqvist <cazfi74@gmail.com>
Date: Sun, 8 May 2022 08:29:07 +0300
Subject: [PATCH 61/61] Meson: Add Qt6-mode support

Default to it already.

See osdn #43364

Signed-off-by: Marko Lindqvist <cazfi74@gmail.com>
---
 doc/INSTALL.meson                |  3 ++
 gen_headers/meson_fc_config.h.in |  2 +-
 meson.build                      | 50 +++++++++++++++++++++++---------
 meson_options.txt                |  6 ++++
 4 files changed, 46 insertions(+), 15 deletions(-)

diff --git a/doc/INSTALL.meson b/doc/INSTALL.meson
index 94cf14e8ba..79eb71bc39 100644
--- a/doc/INSTALL.meson
+++ b/doc/INSTALL.meson
@@ -138,6 +138,9 @@ freeciv-web (boolean):
 gen-packets-args (array):
   Aditional packet generator arguments passed to common/generate_packets.py.
 
+qtver ('qt5'/'qt6'):
+  Whether to build Qt5 or Qt6 versions of the binaries.
+
 
 run.sh
 ------
diff --git a/gen_headers/meson_fc_config.h.in b/gen_headers/meson_fc_config.h.in
index 2bea1938c9..ea46b3057f 100644
--- a/gen_headers/meson_fc_config.h.in
+++ b/gen_headers/meson_fc_config.h.in
@@ -49,7 +49,7 @@
 #define HAVE_FCDB_SQLITE3 1
 
 /* Build in Qt5 mode */
-#define FC_QT5_MODE
+#mesondefine FC_QT5_MODE
 
 /* Release cycle information */
 #mesondefine IS_DEVEL_VERSION
diff --git a/meson.build b/meson.build
index b6e2df7e78..2442c91bbb 100644
--- a/meson.build
+++ b/meson.build
@@ -398,6 +398,10 @@ if get_option('audio') or get_option('clients').contains('sdl2')
   endif
 endif
 
+if get_option('qtver') == 'qt5'
+  priv_conf_data.set('FC_QT5_MODE', 1)
+endif
+
 if get_option('audio')
   priv_conf_data.set('AUDIO_SDL', 1)
 
@@ -2506,17 +2510,27 @@ install_data('data/themes/gtk3.22/Freeciv/gtk-3.0/gtk.css',
 
 endif
 
-qt5_mod = import('qt5')
+if get_option('qtver') == 'qt6'
+  qt_mod = import('qt6')
+
+  qt_dep = dependency('Qt6', modules: ['Core', 'Gui', 'Widgets'], required: false)
+else
+  qt_mod = import('qt5')
 
-qt5_dep = dependency('Qt5', modules: ['Core', 'Gui', 'Widgets'], required: false)
+  qt_dep = dependency('Qt5', modules: ['Core', 'Gui', 'Widgets'], required: false)
+endif
 
 if get_option('clients').contains('qt')
 
-if not qt5_dep.found()
-  error('Qt5 >= 5.11 required for qt-client, but not found')
+if not qt_dep.found()
+  if get_option('qtver') == 'qt6'
+    error('Qt6 >= 6.0 required for qt-client in Qt6 mode, but not found')
+  else
+    error('Qt5 >= 5.11 required for qt-client in Qt5 mode, but not found')
+  endif
 endif
 
-mocced_client = qt5_mod.preprocess(
+mocced_client = qt_mod.preprocess(
   moc_headers: [
    'client/gui-qt/fc_client.h',
    'client/gui-qt/ratesdlg.h',
@@ -2582,7 +2596,7 @@ executable('freeciv-qt',
   'client/gui_interface.c',
   mocced_client, clienticon,
   include_directories: [client_inc, include_directories('client/gui-qt')],
-  dependencies: [qt5_dep, net_dep, gettext_dep],
+  dependencies: [qt_dep, net_dep, gettext_dep],
   link_with: client_common,
   install: true)
 
@@ -2904,11 +2918,15 @@ endif
 
 if get_option('fcmp').contains('qt')
 
-if not qt5_dep.found()
-  error('Qt5 >= 5.11 required for qt-modpack-installer, but not found')
+if not qt_dep.found()
+  if get_option('qtver') == 'qt6'
+    error('Qt6 >= 6.0 required for qt-modpack-installer in Qt6 mode, but not found')
+  else
+    error('Qt5 >= 5.11 required for qt-modpack-installer in Qt5 mode, but not found')
+  endif
 endif
 
-mocced_fcmp = qt5_mod.preprocess(
+mocced_fcmp = qt_mod.preprocess(
   moc_headers: [
    'tools/fcmp/mpgui_qt.h',
    'tools/fcmp/mpgui_qt_worker.h']
@@ -2919,7 +2937,7 @@ executable('freeciv-mp-qt',
   'tools/fcmp/mpgui_qt_worker.cpp',
   mocced_fcmp, mpicon,
   include_directories: tool_inc,
-  dependencies: [qt5_dep, sqlite3_dep, gettext_dep],
+  dependencies: [qt_dep, sqlite3_dep, gettext_dep],
   link_with: [common_lib, fcmp_common],
   install: true
   )
@@ -2957,11 +2975,15 @@ executable('freeciv-ruleup',
 
 if get_option('ruledit')
 
-if not qt5_dep.found()
-  error('Qt5 >= 5.11 required for ruledit, but not found')
+if not qt_dep.found()
+  if get_option('qtver') == 'qt6'
+    error('Qt6 >= 6.0 required for ruledit in Qt6 mode, but not found')
+  else
+    error('Qt5 >= 5.11 required for ruledit in Qt5 mode, but not found')
+  endif
 endif
 
-mocced_ruledit = qt5_mod.preprocess(
+mocced_ruledit = qt_mod.preprocess(
   moc_headers: [
    'tools/ruledit/conversion_log.h',
    'tools/ruledit/edit_impr.h',
@@ -3009,7 +3031,7 @@ executable('freeciv-ruledit',
   'tools/ruledit/validity.c',
   mocced_ruledit, rulediticon,
   include_directories: tool_inc,
-  dependencies: [qt5_dep, m_dep, net_dep, readline_dep, gettext_dep],
+  dependencies: [qt_dep, m_dep, net_dep, readline_dep, gettext_dep],
   link_with: [common_lib, server_lib, ais, tool_lib],
   install: true
   )
diff --git a/meson_options.txt b/meson_options.txt
index 91d2656cff..8d016e92f6 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -59,3 +59,9 @@ option('gen-packets-args',
        type: 'array',
        value: [],
        description: 'Additional arguments for the packet generator')
+
+option('qtver',
+       type: 'combo',
+       choices: ['qt5', 'qt6'],
+       value: 'qt6',
+       description: 'Whether to build Qt5 or Qt6 versions of the binaries')
-- 
2.35.1