[U-Boot] [PATCH 1/2 v6] Make libgcc inclusion from common Makefile overridable by platform config file

[Wolfgang Denk]

Dear Dirk,

In message <4A5A3439.9000208 at googlemail.com> you wrote:
> 
> > And as I mantioned before: I do not oppose the change itself. I agree
> > that it is useful and actually a very good idea to support users  who
> > really  need  this.  The only things I oppose are (1) making this the
> > default (or even mandatory) for all tool chains  and  (2)  making  it
> > architecture-dependent.
> 
> So to do in in positive logic, what do you propose how to enable it? 
> In the other mail you mentioned "The selection could be done by 
> passing some argument or environment variables to "make""?

Right.

> Maybe you could give some (Makefile?) (pseudo?) code that 
> Jean-Christophe gets an idea how to do this correctly? Sorry if this 
> was given already in the Makefile discussion and I missed it.

No example was given yet.

If someone puts enough effort into it, a clean  implementation  would
probably provide a "spec string" with a "%G" definition to the CFLAGS
and thus to the cross compiler's command-line options to override the
GCC-provided  definition of 'libgcc' with a new (U-Boot provided) one
(see gcc.info, Node: Spec Files, Section 3.15 Specifying subprocesses
and the switches to pass to them).

A simpler implementation  could  use  the  '-B_prefix_'  command-line
option to select a different run-time support library.

The feature itself could for example be triggered by using something
like

	$ make USE_PRIVATE_LIBGCC=yes

or
	$ USE_PRIVATE_LIBGCC=yes
	$ export USE_PRIVATE_LIBGCC
	$ make

or similar.

Best regards,

Wolfgang Denk

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