Why does Makefile depend on version.c?

[DJ Delorie]

> Does anyone know why we have this:
> 
>   Makefile: $(srcdir)/Makefile.in config.status $(srcdir)/version.c \
> 
> in gcc/Makefile?  The same goes for:
> 
>   config.status: $(srcdir)/configure $(srcdir)/config.gcc version.c
> 
> It's hard for me to see why changing the version number requires these
> things to be rebuilt.

At one point, the version number was moved around through -D options
or something similar.  You can see remnants of that here:

./Makefile.in:  mainversion=`grep version_string $(srcdir)/version.c | sed -e 's/.*\"\([0-9]*\.[0-9]*\).*/\1/'` 
./ada/Makefile.in:      #mainversion=`sed -e 's/.*\"\([0-9]*\.[0-9]*\).*/\1/' < $(srcdir)/version.c` 

Also, gcc_version_trigger is set through configure.

It looks as if enough has been moved away from that to get rid of the
remnants now, at least in the gcc subdirectory.