RFC: Removing OLD_EXCEPTIONS powerpc multilib variants

[Ralf Corsepius]

Hi,

Till's question has caused me to look into the powerpc multilibs, again.

In RTEMS-CVS/trunk I see that only 2 cpu-variants still apply old-
exception-processing:

dmv177.cfg:CPU_CFLAGS = -mcpu=603e -D_OLD_EXCEPTIONS -Dppc603e
gen405.cfg:CPU_CFLAGS = -mcpu=403 -D_OLD_EXCEPTIONS -Dppc405
helas403.cfg:CPU_CFLAGS = -mcpu=403 -D_OLD_EXCEPTIONS -Dppc403
ppcn_60x.cfg:CPU_CFLAGS = -mcpu=603e -D_OLD_EXCEPTIONS -Dppc603e
score603e.cfg:CPU_CFLAGS = -mcpu=603e -D_OLD_EXCEPTIONS -Dppc603e

Current GCC-4.0 however still supports these old-exception-processing
based multilib-variants:
m403/roe
m601/roe
m601/roe/nof
m602/roe
m602/roe/nof
m603/roe
m603/roe/nof
m603e/roe
m603e/roe/nof

In my understanding, this means, all but
m403/roe
m603e/roe
old-exception-processing multilib variants can be removed [1].

Comments, opinions.

If you should maintain/use an old exception-based BSP not using one of
these 2 variants, which is not in RTEMS main source-tree speak up NOW or
it will be too late :-)

Ralf

[1] The gen405 config above looks suspicious to me -mcpu=405 would be
different ISA than -mcpu=403. Comments?
I am inclined to think a m405/roe multilib is missing.