[Patch] Allow options.[ch] to be possibly regenerated after reconfigure --enable-languages=xxx

[Neil Booth]

Kelley Cook wrote:-

> Neil et al.,
> 
> When testing GCC, I occasionally, for time purposes, will only bootstrap 
> with --enable-languages=c until I'm sure the modifications will work and 
> then afterwards reconfigure with --enable-languages={whatever} && make 
> to get the rest of the languages and libraries built.
> 
> This possibilty stopped working with your option consolidation, since 
> options.[ch] will not get rebuilt if the number of front-ends it is 
> depending on is modified.  f77/top.c, for example, will crash since none 
> of the FOPTS will be in options.h
> 
> The small attached patch adds that support back in.

I have no opinion on this because 1) it doesn't affect me, and 2) I
don't pretend to understand the portability / Makefile / who knows
what else implications.

If it floats your boat and a Makefile person is happy with it then
I'm happy too.  I only would ask one thing - that a comment be
added to explain the reason for the (to me at least) excess code.

Neil.