deprecate the Section member from package struct

A version belongs to a section and has hence a section member of its
own. A package on the other hand can have multiple versions from
different sections. This was "solved" by using the section which was
parsed first as order of sources.list defines, but that is obviously a
horribly unpredictable thing.

Users are way better of with the Section() as returned by the version
they are dealing with. It is likely the same for all versions of a
package, but in the few cases it isn't, it is important (like packages
moving from main/* to contrib/* or into oldlibs …).

Backport of 7a66977 which actually instantly removes the member.

apt-pkg/cacheiterators.h

@@ -160,7 +160,9 @@ class pkgCache::PkgIterator: public Iterator<Package, PkgIterator> {
 
 	// Accessors
 	inline const char *Name() const {return S->Name == 0?0:Owner->StrP + S->Name;}
-	inline const char *Section() const {return S->Section == 0?0:Owner->StrP + S->Section;}
+	// Versions have sections - and packages can have different versions with different sections
+	// so this interface is broken by design. Run as fast as you can to Version.Section().
+	APT_DEPRECATED inline const char *Section() const {return S->Section == 0?0:Owner->StrP + S->Section;}
 	inline bool Purge() const {return S->CurrentState == pkgCache::State::Purge ||
 		(S->CurrentVer == 0 && S->CurrentState == pkgCache::State::NotInstalled);}
 	inline const char *Arch() const {return S->Arch == 0?0:Owner->StrP + S->Arch;}

apt-pkg/cacheset.h

@@ -118,7 +118,16 @@ public:
 		inline const char *Name() const {return getPkg().Name(); }
 		inline std::string FullName(bool const Pretty) const { return getPkg().FullName(Pretty); }
 		inline std::string FullName() const { return getPkg().FullName(); }
-		inline const char *Section() const {return getPkg().Section(); }
+		APT_DEPRECATED inline const char *Section() const {
+#if __GNUC__ >= 4
+	#pragma GCC diagnostic push
+	#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
+	   return getPkg().Section();
+#if __GNUC__ >= 4
+	#pragma GCC diagnostic pop
+#endif
+		}
 		inline bool Purge() const {return getPkg().Purge(); }
 		inline const char *Arch() const {return getPkg().Arch(); }
 		inline pkgCache::GrpIterator Group() const { return getPkg().Group(); }

apt-pkg/depcache.cc

@@ -1226,7 +1226,7 @@ bool pkgDepCache::MarkInstall(PkgIterator const &Pkg,bool AutoInst,
 	       continue;
 	    }
 	    // now check if we should consider it a automatic dependency or not
-	    if(InstPkg->CurrentVer == 0 && Pkg->Section != 0 && ConfigValueInSubTree("APT::Never-MarkAuto-Sections", Pkg.Section()))
+	    if(InstPkg->CurrentVer == 0 && InstVer->Section != 0 && ConfigValueInSubTree("APT::Never-MarkAuto-Sections", InstVer.Section()))
 	    {
 	       if(DebugAutoInstall == true)
 		  std::clog << OutputInDepth(Depth) << "Setting NOT as auto-installed (direct "

apt-pkg/pkgcache.cc

@@ -524,7 +524,10 @@ operator<<(std::ostream& out, pkgCache::PkgIterator Pkg)
       out << " -> " << candidate;
    if ( newest != "none" && candidate != newest)
       out << " | " << newest;
-   out << " > ( " << string(Pkg.Section()==0?"none":Pkg.Section()) << " )";
+   if (Pkg->VersionList == 0)
+      out << " > ( none )";
+   else
+      out << " > ( " << string(Pkg.VersionList().Section()==0?"unknown":Pkg.VersionList().Section()) << " )";
    return out;
 }
 									/*}}}*/