I found another patch for the part where the pretty-printers won't load
at all, starting at
<http://sources.debian.net/src/gcc-4.7/4.7.3-7/debian/patches/gcc-multiarch.diff#L3>:
Index: b/src/libstdc++-v3/python/hook.in
===================================================================
--- a/src/libstdc++-v3/python/hook.in
+++ b/src/libstdc++-v3/python/hook.in
@@ -47,7 +47,10 @@
libdir = libdir[len (prefix):]
# Compute the ".."s needed to get from libdir to the prefix.
- dotdots = ('..' + os.sep) * len (libdir.split (os.sep))
+ backdirs = len (libdir.split (os.sep))
+ if not os.path.basename(os.path.dirname(__file__)).startswith('lib'):
+ backdirs += 1 # multiarch subdir
+ dotdots = ('..' + os.sep) * backdirs
objfile = gdb.current_objfile ().filename
dir_ = os.path.join (os.path.dirname (objfile), dotdots, pythondir)
--
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