implement a public pkgSystem::MultiArchSupported

Some codepaths need to check if the system (in our case usually dpkg)
supports MultiArch or not. We had copy-pasted the check so far into
these paths, but having it as a system check is better for reusability.

1 files changed, 9 insertions, 0 deletions

diff --git a/apt-pkg/pkgsystem.cc b/apt-pkg/pkgsystem.cc
index a6b61e655..2a0fc9d3b 100644
--- a/apt-pkg/pkgsystem.cc
+++ b/apt-pkg/pkgsystem.cc
@@ -12,6 +12,7 @@
 // Include Files							/*{{{*/
 #include<config.h>
 
+#include <apt-pkg/debsystem.h>
 #include <apt-pkg/pkgsystem.h>
 #include <apt-pkg/macros.h>
 
@@ -46,5 +47,13 @@ APT_PURE pkgSystem *pkgSystem::GetSystem(const char *Label)
    return 0;   
 }
 									/*}}}*/
+bool pkgSystem::MultiArchSupported() const				/*{{{*/
+{
+   debSystem const * const deb = dynamic_cast<debSystem const *>(this);
+   if (deb != NULL)
+      return deb->SupportsMultiArch();
+   return true;
+}
+									/*}}}*/
 
 pkgSystem::~pkgSystem() {}