I have been unable to bootstrap mainline on darwin building just the C
and Ada frontends. The stage1 Ada compiler seems to use memory
without
bound (generally crashing my machine too).
I'm not sure if bootstrapping ada is supposed to work on any
particular
platform yet. I did have to manually add "ada" to the BOOT_LANGUAGES
variable in gcc/Makefile after configuration. Is there some special
incantation needed?
I think Ada is not able to build yet on any target yet so this is known
bug really, see PR 15416.
I think you really need to keep up with the mailing list if you are
going to try the mainline.