Hi!
The pre-built version of the stable version of Linaro Toolchain (Linaro GDB 2015.02-3) for Windows is shipped with GDB 7.8-2014.09-1-git. GDB was built with the following options: (gdb) show configuration This GDB was configured as follows: configure --host=i686-w64-mingw32 --target=arm-linux-gnueabihf --with-auto-load-dir=$debugdir:$datadir/auto-load --with-auto-load-safe-path=$debugdir:$datadir/auto-load --without-expat --with-gdb-datadir=/home/buildslave/workspace/BinaryRelease/label/hetzner/target/arm-linux-gnueabihf/_build/builds/destdir/i686-w64-mingw32/share/gdb (relocatable) --with-jit-reader-dir=/home/buildslave/workspace/BinaryRelease/label/hetzner/target/arm-linux-gnueabihf/_build/builds/destdir/i686-w64-mingw32/lib/gdb (relocatable) --without-libunwind-ia64 --without-lzma --without-guile --with-separate-debug-dir=/home/buildslave/workspace/BinaryRelease/label/hetzner/target/arm-linux-gnueabihf/_build/builds/destdir/i686-w64-mingw32/lib/debug (relocatable) --without-zlib --without-babeltrace
As you can see in the output GDB was built without expat support. This is a major problem for widely used micro controllers like ARM Cortex A8 (e.g. used in Beaglebone Black), because the technical description of this microcontroller is loaded out of xml files (arm-with-neon.xml part of GDB). It's also possible to do that manually with "set tdesc filename <xml-file>, before connecting to the target.
Without having the expat option enabled the g package, which is sent from gdbserver during establishing a connection to gdb, can't be parsed correctly. The result is in the first step a warning because of the missing xml support and later on a error regarding the unexpected content of the g package:
warning: Can not parse XML target description; XML support was disabled at compile time Remote 'g' packet reply is too long: 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000f0fcffbe00000000407afdb6300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Old GDB versions of Linaro Toolchain like 7.6.1-2013.10 doesn't have that problem because they were compiled with enabled expat support.
In my opinion there can be two root causes regarding that missing expat support: a) Expat support was explicitly disabled with --without-expat option during the built of GDB. b) On the build machine there wasn't a expat library available when gdb was built.
Best regards, Andreas Schmidl