ProjectExplorer: Remove BuildConfigurationFactory::priority

It's essentially an intrusive hack that's used only to prioritize
Ios+Qmake over plain Qmake. The effect is now achieved by an
arguably equally evil dependency on the construction order of
BuildConfiguration factories.

It can be argued, however, that this is a feature as it allows
user plugins to intentionally override core functionality by
using the standard setup pattern and depending on the to-be-
overridden plugin.

Change-Id: Ic1efa305daf3ca19a880d2a7ccb40e2768d8f57c
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/ios/iosbuildconfiguration.cpp

@@ -145,7 +145,6 @@ IosBuildConfigurationFactory::IosBuildConfigurationFactory()
     registerBuildConfiguration<IosBuildConfiguration>(QmakeProjectManager::Constants::QMAKE_BC_ID);
     addSupportedTargetDeviceType(Constants::IOS_DEVICE_TYPE);
     addSupportedTargetDeviceType(Constants::IOS_SIMULATOR_TYPE);
-    setBasePriority(1);
 }
 
 } // namespace Internal

src/plugins/projectexplorer/buildconfiguration.cpp

@@ -325,7 +325,8 @@ static QList<BuildConfigurationFactory *> g_buildConfigurationFactories;
 
 BuildConfigurationFactory::BuildConfigurationFactory()
 {
-    g_buildConfigurationFactories.append(this);
+    // Note: Order matters as first-in-queue wins.
+    g_buildConfigurationFactories.prepend(this);
 }
 
 BuildConfigurationFactory::~BuildConfigurationFactory()
@@ -333,11 +334,6 @@ BuildConfigurationFactory::~BuildConfigurationFactory()
     g_buildConfigurationFactories.removeOne(this);
 }
 
-int BuildConfigurationFactory::priority(const Target *parent) const
-{
-    return canHandle(parent) ? m_basePriority : -1;
-}
-
 const QList<Task> BuildConfigurationFactory::reportIssues(ProjectExplorer::Kit *kit, const QString &projectPath,
                                                           const QString &buildDir) const
 {
@@ -363,45 +359,28 @@ bool BuildConfigurationFactory::supportsTargetDeviceType(Core::Id id) const
     return m_supportedTargetDeviceTypes.contains(id);
 }
 
-int BuildConfigurationFactory::priority(const Kit *k, const QString &projectPath) const
-{
-    QTC_ASSERT(!m_supportedProjectMimeTypeName.isEmpty(), return -1);
-    if (k && Utils::mimeTypeForFile(projectPath).matchesName(m_supportedProjectMimeTypeName)
-          && supportsTargetDeviceType(DeviceTypeKitInformation::deviceTypeId(k))) {
-        return m_basePriority;
-    }
-    return -1;
-}
-
 // setup
 BuildConfigurationFactory *BuildConfigurationFactory::find(const Kit *k, const QString &projectPath)
 {
-    BuildConfigurationFactory *factory = nullptr;
+    QTC_ASSERT(k, return nullptr);
-    int priority = -1;
+    const Core::Id deviceType = DeviceTypeKitInformation::deviceTypeId(k);
-    for (BuildConfigurationFactory *i : g_buildConfigurationFactories) {
+    for (BuildConfigurationFactory *factory : g_buildConfigurationFactories) {
-        int iPriority = i->priority(k, projectPath);
+        if (Utils::mimeTypeForFile(projectPath).matchesName(factory->m_supportedProjectMimeTypeName)
-        if (iPriority > priority) {
+                && factory->supportsTargetDeviceType(deviceType))
-            factory = i;
-            priority = iPriority;
-        }
-    }
             return factory;
     }
+    return nullptr;
+}
 
 // create
 BuildConfigurationFactory * BuildConfigurationFactory::find(Target *parent)
 {
-    BuildConfigurationFactory *factory = nullptr;
+    for (BuildConfigurationFactory *factory : g_buildConfigurationFactories) {
-    int priority = -1;
+        if (factory->canHandle(parent))
-    for (BuildConfigurationFactory *i : g_buildConfigurationFactories) {
-        int iPriority = i->priority(parent);
-        if (iPriority > priority) {
-            factory = i;
-            priority = iPriority;
-        }
-    }
             return factory;
     }
+    return nullptr;
+}
 
 void BuildConfigurationFactory::setSupportedProjectType(Core::Id id)
 {
@@ -418,11 +397,6 @@ void BuildConfigurationFactory::addSupportedTargetDeviceType(Core::Id id)
     m_supportedTargetDeviceTypes.append(id);
 }
 
-void BuildConfigurationFactory::setBasePriority(int basePriority)
-{
-    m_basePriority = basePriority;
-}
-
 bool BuildConfigurationFactory::canHandle(const Target *target) const
 {
     if (m_supportedProjectType.isValid() && m_supportedProjectType != target->project()->id())
@@ -456,25 +430,13 @@ BuildConfiguration *BuildConfigurationFactory::create(Target *parent, const Buil
 
 BuildConfiguration *BuildConfigurationFactory::restore(Target *parent, const QVariantMap &map)
 {
-    BuildConfigurationFactory *factory = nullptr;
-    int priority = -1;
-    for (BuildConfigurationFactory *i : g_buildConfigurationFactories) {
-        if (!i->canHandle(parent))
-            continue;
     const Core::Id id = idFromMap(map);
-        if (!id.name().startsWith(i->m_buildConfigId.name()))
+    for (BuildConfigurationFactory *factory : g_buildConfigurationFactories) {
-            continue;
-        int iPriority = i->priority(parent);
-        if (iPriority > priority) {
-            factory = i;
-            priority = iPriority;
-        }
-    }
-
-    if (!factory)
-        return nullptr;
-
         QTC_ASSERT(factory->m_creator, return nullptr);
+        if (!factory->canHandle(parent))
+            continue;
+        if (!id.name().startsWith(factory->m_buildConfigId.name()))
+            continue;
         BuildConfiguration *bc = factory->m_creator(parent);
         QTC_ASSERT(bc, return nullptr);
         if (!bc->fromMap(map)) {
@@ -483,6 +445,8 @@ BuildConfiguration *BuildConfigurationFactory::restore(Target *parent, const QVa
         }
         return bc;
     }
+    return nullptr;
+}
 
 BuildConfiguration *BuildConfigurationFactory::clone(Target *parent,
                                                       const BuildConfiguration *source)

src/plugins/projectexplorer/buildconfiguration.h

@@ -128,15 +128,10 @@ protected:
     ~BuildConfigurationFactory() override;
 
 public:
-    // The priority is negative if this factory cannot create anything for the target.
-    // It is 0 for the "default" factory that wants to handle the target.
-    // Add 100 for each specialization.
-    virtual int priority(const Target *parent) const;
     // List of build information that can be used to create a new build configuration via
     // "Add Build Configuration" button.
     const QList<BuildInfo> allAvailableBuilds(const Target *parent) const;
 
-    virtual int priority(const Kit *k, const QString &projectPath) const;
     // List of build information that can be used to initially set up a new build configuration.
     const QList<BuildInfo> allAvailableSetups(const Kit *k, const QString &projectPath) const;
 
@@ -162,7 +157,6 @@ protected:
     void setSupportedProjectMimeTypeName(const QString &mimeTypeName);
     void addSupportedTargetDeviceType(Core::Id id);
     void setDefaultDisplayName(const QString &defaultDisplayName);
-    void setBasePriority(int basePriority);
 
     using BuildConfigurationCreator = std::function<BuildConfiguration *(Target *)>;
 
@@ -183,8 +177,6 @@ private:
     QList<Core::Id> m_supportedTargetDeviceTypes;
     QString m_supportedProjectMimeTypeName;
     IssueReporter m_issueReporter;
-
-    int m_basePriority = 0; // Use higher numbers (1, 2, ...) for higher priorities.
 };
 
 } // namespace ProjectExplorer

src/plugins/qmlprofiler/tests/qmlprofilerdetailsrewriter_test.cpp

@@ -85,11 +85,6 @@ public:
     {
         return {};
     }
-
-    int priority(const ProjectExplorer::Kit *, const QString &) const final
-    {
-        return 0;
-    }
 };
 
 QmlProfilerDetailsRewriterTest::QmlProfilerDetailsRewriterTest(QObject *parent) : QObject(parent)