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Is there a way to generate code for the PPC403GA or PPC403GB (which allow only
strictly-aligned accesses, other than the PPC403GC and all(?) other PPC CPUs)
without a need to patch the sources of GCC and most libraries?
As far as I see out of the sources, only the libraries in newlib are generated with
-mstrict-align, all other libraries (libgcc.a, libgloss.a, libg++.a, libiberty.a, ...)
are generated without this flag and are therefore subject to possible alignment errors.
I added -mstrict-align to the line 'MULTILIB_EXTRA_OPTS = ... ' in gcc/config/rs6000/t-ppc
and gcc/config/rs6000/t-ppcgas to make libgcc.a work and to the line
'CFLAGS_MRELOCATABLE = ...' in libgloss/config/ppc.mh to make libgloss.a work with
the PPC403GA.
In addition, -mcpu=403 should define -mstrict-align too (if using a PPC403GC one may
define -mno-strict-align; this is safer than vice versa).
I am using the following configuration:
gcc from cygnus-2.7.2-970404 (cygwin32 beta18)
newlib-1.8.0
binutils-2.8.1
-jr
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Johannes Reisinger, FREQUENTIS Vienna/AUSTRIA
e-mail: jreising@frequentis.com