[ptxdist] problem compiling gdbserver and gdb with -Wcast-align

[Alexander Dahl <post@lespocky.de>]

Hei hei, 

at the moment we are using ptxdist 2013.07.1 with OSELAS toolchain
2012.12.1 for arm-v5te. We usually have set -Wcast-align in the extra
toolchain options (TARGET_EXTRA_CFLAGS and the two for C++) to spot
alignment problems in our code. Most software packages throw alignment
warnings. Ignoring what this actually means, this is no problem as long
as the package does not set -Werror. gdb sets -Werror. We tried most
currently available versions of gdb and the build fails, e.g. like this:

/home/adahl/Work/bsp/XXX/platform-XXX/build-target/gdbserver-7.5/gdb/gdbserver/../common/agent.c:
In function 'agent_look_up_symbols':
/home/adahl/Work/bsp/XXX/platform-XXX/build-target/gdbserver-7.5/gdb/gdbserver/../common/agent.c:95:2:
error: cast increases required alignment of target type
[-Werror=cast-align]
cc1: all warnings being treated as errors
make[1]: *** [agent.o] Error 1

I guess one could dig into gdb sources, find and hopefully fix the
problem, make a patch, send it to upstream and to ptxdist, wait, do all
the usual things.

One could also drop the additional flag globally.

My question: is it possible to override the TARGET_EXTRA_CFLAGS per
package? Maybe in rules/gdbserver.make? Or would this be a bad idea?

I'd like a quick solution where I don't have to dig into gdb source code
and can keep the global target warnings. O:-)

Greets
Alex

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