Bump minimum supported version of gcc to 4.8.

.travis.yml

@@ -43,14 +43,19 @@ addons:
     branch_pattern: $coverity_branch
     notification_email: sledgehammer999@qbittorrent.org
   apt:
+    sources:
+    # sources list: https://github.com/travis-ci/apt-source-whitelist/blob/master/ubuntu.json
+    - ubuntu-toolchain-r-test
+    - boost-latest
     packages:
     # packages list: https://github.com/travis-ci/apt-package-whitelist/blob/master/ubuntu-precise
     - autoconf
     - automake
     - colormake
+    - g++-4.8
     - libssl-dev
-    - libboost-dev
+    - libboost1.55-dev
-    - libboost-system-dev
+    - libboost-system1.55-dev
     - libqt4-dev
     # Uncomment when Travis upgraded "Ubuntu 12.04 LTS" to a newer version whose repo will have a more up-to-date libtorrent package
     #- libtorrent-rasterbar6
@@ -60,6 +65,7 @@ before_install:
   - if [ "$TRAVIS_BRANCH" = "$coverity_branch" ] && ! [ "$TRAVIS_OS_NAME" = "linux" -a "$lt_branch" = "RC_1_0" -a "$gui" = true ]; then exit ; fi
 
   - shopt -s expand_aliases
+  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then export CC=gcc-4.8 CXX=g++-4.8 ; fi
   - if [ "$TRAVIS_BRANCH" != "$coverity_branch" -a "$TRAVIS_OS_NAME" = "linux" ]; then dpkg-query -L ccache && export PATH="/usr/lib/ccache/:$PATH" ; fi
   - alias make="colormake -j3" # Using nprocs/2 sometimes may fail (gcc is killed by system)
 
@@ -90,6 +96,7 @@ install:
 script:
   - if [ "$TRAVIS_BRANCH" = "$coverity_branch" ]; then exit ; fi # Skip usual build when running coverity scan
   - ./bootstrap.sh && ./configure $qbtconf
+  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then echo QMAKE_CC=$CC >> conf.pri && echo QMAKE_CXX=$CXX >> conf.pri ; fi
   - make && make install
 
 after_success:

unixconf.pri

@@ -10,17 +10,13 @@ exists($$OUT_PWD/../conf.pri) {
 }
 
 # C++11 support
-lessThan(QT_MAJOR_VERSION, 5): QMAKE_CXXFLAGS += -std=c++0x
+lessThan(QT_MAJOR_VERSION, 5): QMAKE_CXXFLAGS += -std=c++11
 
 # COMPILATION SPECIFIC
-!nogui:dbus {
+!nogui:dbus: QT += dbus
-    QT += dbus
-}
 
 QMAKE_CXXFLAGS += -Wformat -Wformat-security
-!haiku {
+!haiku: QMAKE_LFLAGS_APP += -rdynamic
-    QMAKE_LFLAGS_APP += -rdynamic
-}
 
 # Man page
 nogui {