Re-add support for G++ 4.8 and configure travis to use it

This makes tests work again!

Gbp-Dch: ignore

.travis.yml

@@ -4,6 +4,8 @@ before_install:
  - sudo apt-get update -q
 install:
  - sudo ./prepare-release travis-ci
- - export CC=gcc-5
- - export CXX=g++-5
-script: make -j1 && make test && test/integration/run-tests
+ - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
+ - sudo apt-get -qq update
+ - sudo apt-get -qq install g++-4.8
+ - export CXX=g++-4.8
+script: make && make test && test/integration/run-tests

apt-pkg/cacheset.h

@@ -407,7 +407,7 @@ public:									/*{{{*/
 	bool empty() const APT_OVERRIDE { return _cont.empty(); }
 	void clear() APT_OVERRIDE { return _cont.clear(); }
 	size_t size() const APT_OVERRIDE { return _cont.size(); }
-#if __cplusplus >= 201103L
+#if __GNUC__ >= 5 || (__GNUC_MINOR__ >= 9 && __GNUC__ >= 4)
 	iterator erase( const_iterator pos ) { return iterator(_cont.erase(pos._iter)); }
 	iterator erase( const_iterator first, const_iterator last ) { return iterator(_cont.erase(first._iter, last._iter)); }
 #else
@@ -897,7 +897,7 @@ public:									/*{{{*/
 	bool empty() const APT_OVERRIDE { return _cont.empty(); }
 	void clear() APT_OVERRIDE { return _cont.clear(); }
 	size_t size() const APT_OVERRIDE { return _cont.size(); }
-#if __cplusplus >= 201103L
+#if __GNUC__ >= 5 || (__GNUC_MINOR__ >= 9 && __GNUC__ >= 4)
 	iterator erase( const_iterator pos ) { return iterator(_cont.erase(pos._iter)); }
 	iterator erase( const_iterator first, const_iterator last ) { return iterator(_cont.erase(first._iter, last._iter)); }
 #else

apt-private/private-cachefile.cc

@@ -33,7 +33,7 @@ static bool SortPackagesByName(pkgCache * const Owner,
    return strcmp(Owner->StrP + GA->Name, Owner->StrP + GB->Name) <= 0;
 }
 SortedPackageUniverse::SortedPackageUniverse(CacheFile &Cache) :
-      PackageUniverse{Cache}, List{Cache.UniverseList}
+      PackageUniverse{Cache}, List(Cache.UniverseList)
 {
 }
 void SortedPackageUniverse::LazyInit() const

apt-private/private-cacheset.cc

@@ -118,7 +118,7 @@ CacheSetHelperVirtuals::CacheSetHelperVirtuals(bool const ShowErrors, GlobalErro
 
 // CacheSetHelperAPTGet - responsible for message telling from the CacheSets/*{{{*/
 CacheSetHelperAPTGet::CacheSetHelperAPTGet(std::ostream &out) :
-   APT::CacheSetHelper{true}, out{out}
+   APT::CacheSetHelper{true}, out(out)
 {
    explicitlyNamed = true;
 }

debian/control

@@ -10,7 +10,7 @@ Build-Depends: dpkg-dev (>= 1.15.8), debhelper (>= 8.1.3~), libdb-dev,
  zlib1g-dev, libbz2-dev, liblzma-dev,
  xsltproc, docbook-xsl, docbook-xml, po4a (>= 0.34-2),
  autotools-dev, autoconf, automake, libgtest-dev,
- g++-5 (>= 5.1.1-20)
+ g++ (>= 4:5.2)
 Build-Depends-Indep: doxygen, w3m, graphviz
 Build-Conflicts: autoconf2.13, automake1.4
 Vcs-Git: git://anonscm.debian.org/apt/apt.git