Added include directory argument for Qt's Moc which is needed to build plugins.

Signed-off-by: Alexis Jeandet <alexis.jeandet@member.fsf.org>

8 files changed, 69 insertions, 11 deletions

diff --git a/docs/markdown/Qt5-module.md b/docs/markdown/Qt5-module.md
index 7082309..a8ad73d 100644
--- a/docs/markdown/Qt5-module.md
+++ b/docs/markdown/Qt5-module.md
@@ -5,17 +5,19 @@ tools and steps required for Qt. The module has one method.
 
 ## preprocess
 
-This method takes four keyword arguments, `moc_headers`,
+This method takes five keyword arguments, `moc_headers`,
 `moc_sources`, `ui_files` and `qresources` which define the files that
-require preprocessing with `moc`, `uic` and `rcc`. It returns an
+require preprocessing with `moc`, `uic` and `rcc` and 'include_directories' which might be needed by moc. It returns an
 opaque object that should be passed to a main build target. A simple
 example would look like this:
 
 ```meson
 qt5 = import('qt5')
 qt5_dep = dependency('qt5', modules: ['Core', 'Gui'])
-moc_files = qt5.preprocess(moc_headers : 'myclass.h')
+inc = include_directories('includes')
+moc_files = qt5.preprocess(moc_headers : 'myclass.h', include_directories: inc)
 executable('myprog', 'main.cpp', 'myclass.cpp', moc_files,
+           include_directories: inc,
            dependencies : qt5_dep)
 ```
 
diff --git a/mesonbuild/modules/qt4.py b/mesonbuild/modules/qt4.py
index a63aff8..4ab07b9 100644
--- a/mesonbuild/modules/qt4.py
+++ b/mesonbuild/modules/qt4.py
@@ -21,6 +21,7 @@ from . import ExtensionModule
 import xml.etree.ElementTree as ET
 from . import ModuleReturnValue
 from ..interpreterbase import permittedKwargs
+from . import get_include_args
 
 class Qt4Module(ExtensionModule):
     tools_detected = False
@@ -97,10 +98,10 @@ class Qt4Module(ExtensionModule):
         except Exception:
             return []
 
-    @permittedKwargs({'moc_headers', 'moc_sources', 'ui_files', 'qresources', 'method'})
+    @permittedKwargs({'moc_headers', 'moc_sources', 'include_directories', 'ui_files', 'qresources', 'method'})
     def preprocess(self, state, args, kwargs):
-        rcc_files, ui_files, moc_headers, moc_sources, sources \
-            = extract_as_list(kwargs, 'qresources', 'ui_files', 'moc_headers', 'moc_sources', 'sources', pop = True)
+        rcc_files, ui_files, moc_headers, moc_sources, sources, include_directories \
+            = extract_as_list(kwargs, 'qresources', 'ui_files', 'moc_headers', 'moc_sources', 'sources', 'include_directories', pop = True)
         sources += args[1:]
         method = kwargs.get('method', 'auto')
         self._detect_tools(state.environment, method)
@@ -133,9 +134,10 @@ class Qt4Module(ExtensionModule):
             ui_gen = build.Generator([self.uic], ui_kwargs)
             ui_output = ui_gen.process_files('Qt4 ui', ui_files, state)
             sources.append(ui_output)
+        inc = get_include_args(include_dirs=include_directories)
         if len(moc_headers) > 0:
             moc_kwargs = {'output': 'moc_@BASENAME@.cpp',
-                          'arguments': ['@INPUT@', '-o', '@OUTPUT@']}
+                          'arguments': inc + ['@INPUT@', '-o', '@OUTPUT@']}
             moc_gen = build.Generator([self.moc], moc_kwargs)
             moc_output = moc_gen.process_files('Qt4 moc header', moc_headers, state)
             sources.append(moc_output)
diff --git a/mesonbuild/modules/qt5.py b/mesonbuild/modules/qt5.py
index 08ce662..001caa7 100644
--- a/mesonbuild/modules/qt5.py
+++ b/mesonbuild/modules/qt5.py
@@ -21,6 +21,7 @@ from . import ExtensionModule
 import xml.etree.ElementTree as ET
 from . import ModuleReturnValue
 from ..interpreterbase import permittedKwargs
+from . import get_include_args
 
 class Qt5Module(ExtensionModule):
     tools_detected = False
@@ -103,10 +104,10 @@ class Qt5Module(ExtensionModule):
         except Exception:
             return []
 
-    @permittedKwargs({'moc_headers', 'moc_sources', 'ui_files', 'qresources', 'method'})
+    @permittedKwargs({'moc_headers', 'moc_sources', 'include_directories', 'ui_files', 'qresources', 'method'})
     def preprocess(self, state, args, kwargs):
-        rcc_files, ui_files, moc_headers, moc_sources, sources \
-            = extract_as_list(kwargs, 'qresources', 'ui_files', 'moc_headers', 'moc_sources', 'sources', pop = True)
+        rcc_files, ui_files, moc_headers, moc_sources, sources, include_directories \
+            = extract_as_list(kwargs, 'qresources', 'ui_files', 'moc_headers', 'moc_sources', 'sources', 'include_directories', pop = True)
         sources += args[1:]
         method = kwargs.get('method', 'auto')
         self._detect_tools(state.environment, method)
@@ -139,9 +140,10 @@ class Qt5Module(ExtensionModule):
             ui_gen = build.Generator([self.uic], ui_kwargs)
             ui_output = ui_gen.process_files('Qt5 ui', ui_files, state)
             sources.append(ui_output)
+        inc = get_include_args(include_dirs=include_directories)
         if len(moc_headers) > 0:
             moc_kwargs = {'output': 'moc_@BASENAME@.cpp',
-                          'arguments': ['@INPUT@', '-o', '@OUTPUT@']}
+                          'arguments': inc + ['@INPUT@', '-o', '@OUTPUT@']}
             moc_gen = build.Generator([self.moc], moc_kwargs)
             moc_output = moc_gen.process_files('Qt5 moc header', moc_headers, state)
             sources.append(moc_output)
diff --git a/test cases/frameworks/4 qt/meson.build b/test cases/frameworks/4 qt/meson.build
index d9cab6f..c6f108b 100644
--- a/test cases/frameworks/4 qt/meson.build
+++ b/test cases/frameworks/4 qt/meson.build
@@ -70,5 +70,15 @@ foreach qt : ['qt4', 'qt5']
       dependencies : qtcore)
 
     test(qt + 'maninclude', qtmaninclude)
+
+    # building Qt plugins implies to give include path to moc
+    plugin_includes = include_directories('pluginInterface', 'plugin')
+    pluginpreprocess = qtmodule.preprocess(
+      moc_headers : 'plugin/plugin.h',
+      include_directories : plugin_includes
+    )
+    plugin = library('plugin', 'plugin/plugin.cpp', pluginpreprocess,
+          include_directories : plugin_includes,
+          dependencies : qtcore)
   endif
 endforeach
diff --git a/test cases/frameworks/4 qt/plugin/plugin.cpp b/test cases/frameworks/4 qt/plugin/plugin.cpp
new file mode 100644
index 0000000..eeae98d
--- /dev/null
+++ b/test cases/frameworks/4 qt/plugin/plugin.cpp
@@ -0,0 +1,7 @@
+#include "plugin.h"
+#include <QFile>
+
+QString plugin1::getResource()
+{
+    return "hello world";
+}
diff --git a/test cases/frameworks/4 qt/plugin/plugin.h b/test cases/frameworks/4 qt/plugin/plugin.h
new file mode 100644
index 0000000..1138f41
--- /dev/null
+++ b/test cases/frameworks/4 qt/plugin/plugin.h
@@ -0,0 +1,11 @@
+#pragma once
+#include <plugin_if.h>
+
+class plugin1:public QObject,public PluginInterface
+{
+    Q_OBJECT
+    Q_INTERFACES(PluginInterface)
+    Q_PLUGIN_METADATA(IID "demo.PluginInterface" FILE "plugin.json")
+public:
+    QString getResource() override;
+};
diff --git a/test cases/frameworks/4 qt/plugin/plugin.json b/test cases/frameworks/4 qt/plugin/plugin.json
new file mode 100644
index 0000000..6c6a011
--- /dev/null
+++ b/test cases/frameworks/4 qt/plugin/plugin.json
@@ -0,0 +1,3 @@
+{
+    "name" : "Plugin1"
+}
diff --git a/test cases/frameworks/4 qt/pluginInterface/plugin_if.h b/test cases/frameworks/4 qt/pluginInterface/plugin_if.h
new file mode 100644
index 0000000..97d2800
--- /dev/null
+++ b/test cases/frameworks/4 qt/pluginInterface/plugin_if.h
@@ -0,0 +1,21 @@
+#ifndef PLUGIN_IF_H
+#define PLUGIN_IF_H
+
+#include <QString>
+#include <QtPlugin>
+
+/**
+ * @brief Interface for a plugin
+ */
+class PluginInterface
+{
+public:
+    virtual ~PluginInterface() = default;
+
+    /// Initializes the plugin
+    virtual QString getResource() = 0;
+};
+
+Q_DECLARE_INTERFACE(PluginInterface, "demo.PluginInterface")
+
+#endif