Q: Setting build parameters for a sub-tree of RTEMS sources

[John M. Mills]

Hello -

I would like to set two flags to specific values below a certain point in
my source tree, while allowing '$RTEMS_BSP.cfg' to control them elsewhere.

This is in order to avoid inappropriate optimization when I access
hardware registers. I have not been successful with 'volatile'
declarations, I have found optimization levels which work, and I would
still like to apply higher optimization levels to the rest of the source
tree.

In my case these flags are 'CFLAGS_OPTIMIZE_V' and 'CFLAGS_DEBUG_V'. I see
in the root of this specific sub-tree that 'aclocal.m4' conditionally
redefines 'CFLAGS', which presumably contains my two flags.

The particular branch is: 'c/src/lib/libbsp/sh/gensh2', though my question
is a general one.

Can anyone suggest how to modify such a part of 'CFLAGS' so I force the
optimizaton levels I want?

Thanks -

   John Mills
   Sr. Software Engineer
   TGA Technologies, Inc.
   100 Pinnacle Way, Suite 140
   Norcross, GA 30071-3633
   e-mail: jmills at tga.com
   Phone: 770-441-2100 ext.124 (voice)
          770-449-7740 (FAX)