bug#20887: 'make bootstrap' now verrrry slow due to recent isearch changes

[Paul Eggert]

Artur Malabarba wrote:
> Does anyone know what could cause these 4 seconds to become 5 min
> during bootstrap?

I'm not sure, but during bootstrap, the compiler hasn't been compiled yet; it's 
being interpreted.  So it's very slow.  The build process attempts to compile 
the compiler first, so that the rest of the build finishes faster, but the early 
part of the bootstrap must be done with a slow compiler.

> Does bootstrap compile the file 60 times? =P

Yes, it seems so.  With a slow compiler.  It takes hours.  It's really bad.

Please try the recipe I gave Glenn:

rm -f src/bootstrap-emacs src/emacs $(find . -name '*.elc')
make