bootstrap failure, linux, today's mainline

[Jan Hubicka]

> I just copied over the current CVS (rsync the CVS database, then a
> clean checkout of the result).  Did a bootstrap, it fails in stage 2.
> 
> This is RedHat linux 7.2, kernel 2.4.18, base gcc is 3.0.2, binutils
> from the current binutils cvs server.
> 
> In file included from /lhome/pkoning/gcccvs/gcc-20020605/gcc/gcc/gengenrtl.c:29:/lhome/pkoning/gcccvs/gcc-20020605/gcc/gcc/real.h:122:8: #error "REAL_WIDTH > 5 not supported"
> In file included from /lhome/pkoning/gcccvs/gcc-20020605/gcc/gcc/gengenrtl.c:40:/lhome/pkoning/gcccvs/gcc-20020605/gcc/gcc/rtl.def:727: `CONST_DOUBLE_FORMAT' undeclared here (not in a function)

This is misscompilation from 3.0.x GCC.  You need to use different
version as bootstrap compiler :(

Honza
> /lhome/pkoning/gcccvs/gcc-20020605/gcc/gcc/rtl.def:727: initializer element is not constant
> /lhome/pkoning/gcccvs/gcc-20020605/gcc/gcc/rtl.def:727: (near initialization for `defs[65].format')
> /lhome/pkoning/gcccvs/gcc-20020605/gcc/gcc/rtl.def:727: warning: missing initializer
> /lhome/pkoning/gcccvs/gcc-20020605/gcc/gcc/rtl.def:727: warning: (near initialization for `defs[65].format')
> /lhome/pkoning/gcccvs/gcc-20020605/gcc/gcc/rtl.def:727: initializer element is not constant
> /lhome/pkoning/gcccvs/gcc-20020605/gcc/gcc/rtl.def:727: (near
> initialization for `defs[65]') ...
> 
> and lots more error messages, probably all caused by the initial
> error.
> 
> I ran into this yesterday with a slightly older CVS checkout.  In that
> one I did a --save-temps -dD and looked at the resulting rtl.i to see
> whether that explains the #error.  It doesn't; the REAL_WIDTH I see in
> rtl.i evaluates to 3.  So it looks like something wrong in expression
> evaluation in the preprocessor...
> 
>      paul
>