debListParser: Avoid native arch lookup in ParseDepends

We called low-level ParseDepends without an architecture each time,
which means each call looked up the native architecture. Store the
native architecture in the class and use that when calling low-level
ParseDepends from the high-level ParseDepends().

This improves performance for a cache build from 2.7 to 2.5 seconds
for me.

Also avoid a call when stripping multiarch, as the native architecture
is passed in.

1 files changed, 1 insertions, 0 deletions

diff --git a/apt-pkg/deb/deblistparser.h b/apt-pkg/deb/deblistparser.h
index 09b56665f..f02252d58 100644
--- a/apt-pkg/deb/deblistparser.h
+++ b/apt-pkg/deb/deblistparser.h
@@ -45,6 +45,7 @@ class APT_HIDDEN debListParser : public pkgCacheListParser
    std::vector<std::string> forceEssential;
    std::vector<std::string> forceImportant;
    std::string MD5Buffer;
+   std::string myArch;
 
    protected:
    pkgTagFile Tags;