Re: crosstool-NG with GCC V3.X.X

[Arnaud Lacombe <lacombar at gmail dot com>]

Hi,

On Tue, May 11, 2010 at 5:51 AM, Yann E. MORIN
<yann.morin.1998@anciens.enib.fr> wrote:
> Andy,
>
> This kind of questins are best CCed to the mailing list.
>
> On Monday 10 May 2010 12:36:01 Andy Pevy wrote:
>> I have picked up an old project that needs some modifications to
>> it, and it was originally built using DaVinci-ARM GCC 3.4.3 from
>> MontaVista and has kernel 2.6.10. I have tried compiling it with
>> crosstool-NG compiled GCC 4.3.2 but the compiler is being too fussy
>> about some of the kernel constructs.
>> Is it possible to recreate the 3.4.3 tool set using crosstool-NG please ?.
>
> In crosstool-NG, gcc-3.x.x is considered 'obsolete', and the only 3.x.x
> version still available is 3.4.6. You have to enable support for obsolete
> versions:
>
> ?Paths and misc options ?--->
> ? ?[*] Use obsolete features
>
> ?Operating System ?--->
> ? ?Get kernel headers from: (Use custom headers)
> ? ?( /some/where) Path to custom headers directory/tarball
>
> ?C compiler ?--->
> ? ?gcc version (3.4.6 (OBSOLETE))
>
> Of course, I would highly encourage you to update your kernel and gcc.
> There is a sample in crosstool-NG that can build for the DaVinci processor:
>
> ?# ct-ng show-arm-davinci-linux-gnueabi
> ?arm-davinci-linux-gnueabi ?[L ?]
> ? ? ?OS ? ? ? ? ? ? : linux-2.6.33.2
> ? ? ?Companion libs : gmp-4.3.2 mpfr-2.4.2 libelf-0.8.13
> ? ? ?binutils ? ? ? : binutils-2.20
> ? ? ?C compiler ? ? : gcc-4.3.2 (C,C++)
> ? ? ?C library ? ? ?: glibc-2.9
> ? ? ?Tools ? ? ? ? ?: dmalloc-5.5.2 duma-2_5_15 gdb-6.8 ltrace-0.5.3 strace-4.5.19
>
> To use that sample:
>
> ?# ct-ng arm-davinci-linux-gnueabi
> ?Now configured for "arm-davinci-linux-gnueabi"
> ?# ct-ng build
>
> Of course, this sample builds a toolchain with headers from Linux 2.6.33.2,
> and will require that you run the 2.6.33.2 kernel on your target. This is
> really what I would recommend, that you update your kernel. 2.6.10 is now
> really, really old...
>
Sometimes, people have no choice but to use an old kernel, especially
when you need to make change to an old project, or when you don't have
the control of the main project. The cost of bringing up a new BSP
might also be too high or the original vendor may even not support it
anymore. I have no interest to see people in this situation be turned
down, as I am one of them.

That said, I have a few patches to support those environment (ie truly
supporting all 2.6 and [maybe] 2.4 kernel). I shall put these in a
public git tree, but it needs some clean-up first. If you are
interested by these patches, please pick them. As of the ETA, it
should be good by the end of the week.

my 0.2c,
 - Arnaud

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