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Re: [PATCH] remove target_os

From: Christian Franke
Subject: Re: [PATCH] remove target_os
Date: Thu, 29 Jan 2009 08:00:40 +0100
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20080702 SeaMonkey/1.1.11

Javier Martín wrote:
El mar, 27-01-2009 a las 20:56 +0100, Christian Franke escribió:
Is building a bare 'no-OS' compiler supported by the upstream GCC sources?
Probably a too strict prerequisite for building GRUB.

I can't vouch so for all possible environments, but I can say that
"clean" no-OS targets like i386-pc-elf exist at least for x86 and x86_64
(this last being added as of GCC 4.3.2). However, as I said, if
-ffreestanding does not do its job of providing a "true" freestanding
environment (i.e. without relying on _any_ external libraries or
syscalls, as opposite to the usual hosted environment), a bug report
should be posted.

I haven't examined more recent gcc sources yet, the extra effect of -ffreestanding on 4.3.1 is a no-op if the program does not use main().

How do those no-OS targets handle the platform independent libgcc functions, e.g. __divdi3 which is used for 64bit integer division at least on i386 ? Is a no-OS version of libgcc provided or should the programmer handle these cases ?


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