[rfa/rfc] Build libcommon.a for gdb and gdbserver

[Tom Tromey]

>>>>> "Yao" == Yao Qi <yao@codesourcery.com> writes:

Yao> AFAIK, there are three problems,

Yao> Am I missing any problems else?

I think the rule to build common/Makefile in gdb/Makefile.in is wrong.
It says:

common/Makefile: configure-common common/Makefile.in config.status @frags@
        CONFIG_FILES="common/Makefile" \
          CONFIG_COMMANDS="depfiles" \
          CONFIG_HEADERS= \
          CONFIG_LINKS= \
          $(SHELL) config.status


But since we are running a separate configure script in common/, it is
incorrect to run this directory's config.status to try to make it.

Usually one doesn't bother with this stuff -- just recurse and let the
subdir Makefile rebuild itself as needed.

Tom