David Jensen wrote: > On Wed, 01 Dec 2010 11:38:06 -0600 > Bruce Dubbs <bruce.du...@gmail.com> wrote: > >> David Jensen wrote: >> >>> The point of the thread is that the 'chapter 5 gcc pass 2' and the >>> 'chapter 6 gcc' instructions and explanations are inconsistent, >>> confusing and wrong for all but i?86. Maybe even completely >>> outdated. >> I'm not an expert on compilers, but the GCC instructions in Chapter 5 >> and Chapter 6 need to be different for our purposes. >> >> What we have now works. I'm reluctant to change the instructions on >> such an important component unless there are clear advantages. >> >> -- Bruce > > Well, maybe I'm nitpicking but 'chapter 5 gcc pass 2' says if you have > an x86 do this, while 'chapter 6 gcc' says for consistency do something > else. The 'chapter 6 gcc' instructions do not work to give > consistency on x86_64. IMHO
In Chapter 5, we are not doing a full bootstrap, so we add -fomit-frame-pointer so it will produce the same codes as if it was a full bootstrap. In Chapter 6, we do the same thing. I think, but I'm not sure, that -fomit-frame-pointer is the default for x86_64. If this is correct, perhaps we can tweak the text a little to clarify. OTOH, it may not hurt anything to just add the flag unconditionally in Chapter 6 by removing the case statement. -- Bruce -- http://linuxfromscratch.org/mailman/listinfo/lfs-dev FAQ: http://www.linuxfromscratch.org/faq/ Unsubscribe: See the above information page
