ARM Cortex-M Microcontroller startup files

[Iain Buclaw via Digitalmars-d]

On 26 April 2015 at 22:41, Jens Bauer via Digitalmars-d
<digitalmars-d at puremagic.com> wrote:
> On Sunday, 26 April 2015 at 18:23:47 UTC, Martin Nowak wrote:
>>
>> On 04/26/2015 07:29 PM, Jens Bauer wrote:
>>>
>>> Unfortunately, I have not been able to build with multilib yet, so my
>>> setup cannot build code for Cortex-M0; it keeps stuffing Cortex-M3 and
>>> Cortex-M4 instructions in there.
>>
>>
>> The wiki says to disable multilib
>>
>> (http://wiki.dlang.org/Bare_Metal_ARM_Cortex-M_GDC_Cross_Compiler#Build_GCC),
>> what's the problem?
>
>
> The problem is that I cannot have a single compiler, which compiles for
> these architectures:
> ARM7TDMI
> Cortex-M0
> Cortex-M3
> Cortex-M4
>
> Using a Cortex-M3 or Cortex-M4 compiler to build code for a Cortex-M0, will
> insert 32-bit instructions randomly (most code is 16-bit, though, so parts
> of it gets it right). As soon as the microcontroller tries to run a 32-bit
> instruction, it will crash.
>
> -In order to build code for Cortex-M0 or Cortex-M0+, I will have to rebuild
> the compiler.
> The alternative is to build 5 different compilers. I don't want that either.
>
> ...
>
> The reason I cannot build GDC with multilib, is that I get a compile-error
> when building the final GCC+GDC.
> Building GCC alone without GDC gives me no such error.
> -So if I want to have multilib support, I will have to be without GDC.

Where exactly does it error?

I can't think of a sole reason why gdc/libphobos would throw an error
in multilib builds, so it must be something collateral (libstdc++) ?

Regards
Iain.