add ENABLE_MAKE_UNIQUE flag for older gcc versions

-- fix #754
-- make_unique function is not available for gcc<=4.8.x
by enabling this flag in through install script or through
cmake such systems can build latte correctly

CMakeLists.txt

@@ -56,11 +56,11 @@ include(WriteBasicConfigVersionFile)
 
 include(Definitions.cmake)
 
+add_subdirectory(liblattedock)
 add_subdirectory(app)
 add_subdirectory(applets)
 add_subdirectory(containment)
 add_subdirectory(icons)
-add_subdirectory(liblattedock)
 add_subdirectory(plasmoid)
 add_subdirectory(shell)
 

install.sh

@@ -7,6 +7,12 @@ set -e
 build_type=$1
 build_type=${build_type:="Release"}
 
+enable_make_unique=OFF
+
+if [ "$1" == "--enable-make-unique" ] || [ "$2" == "--enable-make-unique" ]  ; then
+    enable_make_unique=ON
+fi
+
 if ! [ -a build ] ; then
     mkdir build
 fi
@@ -21,13 +27,13 @@ if [ -a locale ] ; then
 fi
 
 if [ "$1" == "--translations" ] ; then
-    cmake -DCMAKE_INSTALL_PREFIX=/usr -DKDE_L10N_BRANCH=trunk -DKDE_L10N_AUTO_TRANSLATIONS=ON -DCMAKE_BUILD_TYPE=$build_type ..
+    cmake -DCMAKE_INSTALL_PREFIX=/usr -DKDE_L10N_BRANCH=trunk -DKDE_L10N_AUTO_TRANSLATIONS=ON -DENABLE_MAKE_UNIQUE=$enable_make_unique -DCMAKE_BUILD_TYPE=$build_type ..
     make fetch-translations
 elif [ "$1" == "--translations-stable" ] ; then
-    cmake -DCMAKE_INSTALL_PREFIX=/usr -DKDE_L10N_BRANCH=stable -DKDE_L10N_AUTO_TRANSLATIONS=ON -DCMAKE_BUILD_TYPE=$build_type ..
+    cmake -DCMAKE_INSTALL_PREFIX=/usr -DKDE_L10N_BRANCH=stable -DKDE_L10N_AUTO_TRANSLATIONS=ON -DENABLE_MAKE_UNIQUE=$enable_make_unique -DCMAKE_BUILD_TYPE=$build_type ..
     make fetch-translations    
 else
-    cmake -DCMAKE_INSTALL_PREFIX=/usr -DKDE_L10N_AUTO_TRANSLATIONS=OFF -DCMAKE_BUILD_TYPE=$build_type ..
+    cmake -DCMAKE_INSTALL_PREFIX=/usr -DKDE_L10N_AUTO_TRANSLATIONS=OFF -DENABLE_MAKE_UNIQUE=$enable_make_unique -DCMAKE_BUILD_TYPE=$build_type ..
     make
 fi
 

liblattedock/CMakeLists.txt

@@ -1,3 +1,5 @@
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/config-latte-lib.h.cmake ${CMAKE_CURRENT_BINARY_DIR}/config-latte-lib.h)
+
 set(lattedock_SRCS
     lattedockplugin.cpp
     quickwindowsystem.cpp

liblattedock/config-latte-lib.h.cmake

@@ -0,0 +1,6 @@
+#ifndef CONFIG_LATTE_LIB_H
+#define CONFIG_LATTE_LIB_H
+
+#cmakedefine01 ENABLE_MAKE_UNIQUE
+
+#endif // CONFIG_LATTE_LIB_H

liblattedock/extras.h

@@ -1,6 +1,8 @@
 #ifndef EXTRAS_H
 #define EXTRAS_H
 
+#include "../liblattedock/config-latte-lib.h"
+
 #include <QObject>
 #include <QString>
 #include <QStringBuilder>
@@ -15,6 +17,19 @@
 #include <memory>
 #include <cmath>
 
+//! There are gcc versions that dont support yet that function even though they
+//! publish themselves as C++14 compatible. Such a case is gcc 4.8.x that openSUSE
+//! LEAP 42.2-3 is using. By enabling this flag such systems can be build correctly.
+#if ENABLE_MAKE_UNIQUE
+namespace std {
+template<class T, class... Args>
+unique_ptr<T> make_unique(Args &&... args)
+{
+    return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
+}
+}
+#endif
+
 /*!
  * @brief convert a QRect to a QString with format `(<x>, <y>) <width>x<height>`
  */