[PATCH] RFC: enable pretty printers for --enable-libstdcxx-debug libs

[Jonathan Wakely]

The --enable-libstdcxx-debug option builds extra versions of libstdc++
without optimisation and installs them in $libdir/debug, which can be
used via RPATH or LD_LIBRARY_PATH. However, there's no gdb.py
installed alongside those debug versions of the libs, so while you can
step into unoptimised libstdc++ code in GDB, you can't use the pretty
printers.

This patch installs a symlink in $libdir/debug pointing to the gdb.py
file in the parent dir, and adjusts the gdb.py file to handle the
$libdir/debug case. This seems to work. An alternative would be to
install a modified copy of the gdb.py file specific to that directory,
instead of a symlink to a file that works for either case.

Better ideas are welcome.


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