target/10743: Build error for CPP when building Cross compiler and host and target have diff character sets (i370)

[ivan@vmfacility.fr]

>Number:         10743
>Category:       target
>Synopsis:       Build error for CPP when building Cross compiler and host and target have diff character sets (i370)
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon May 12 09:36:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Ivan Warren
>Release:        gcc 3.2.3
>Organization:
>Environment:
Host i686-linux, Target i370-ibm-mvs
>Description:
When attempting a cross compile build, cpp0 cannot be built because it is refereing to macro 'MVS_MAPCHAR' in cpplex.c which is mapped to mvs_map_char in gcc/config/i370.[ch] (which belongs in libbackend.a). Commenting out the ifdef/endif allows building the cpp, but resulting character constants are then ASCII (and not EBCDIC). My belief is that this will affect any attempt at creating a cross compiler when host and target need a backend specific character translator. I understand what I am attempting may not be supported, but this issue could affect any further attempts at building a clean cross compiler.
>How-To-Repeat:
../gcc-3.3.3/configure --target=i370-ibm-mvs --enable-languages=c
make

(note : the build errors I get on the C library are expected.. I am only interrested in the assembler output of the C compiler and do my own C Library - freestanding compiles, and my target is NOT a Un*x variant)..
>Fix:
I have no readilly available fix for this issue. The problem lies in the interdependance created by invoking MAP_CHARACTER from within cpplex.c which creates a dependance by cpplex.c for libbackend.a, while libbackend.a cannot be used on cpp0.
>Release-Note:
>Audit-Trail:
>Unformatted: