[Buildroot] RPC support for modern (e)glibc toolchains

[Arnout Vandecappelle <arnout@mind.be>]

On 07/03/12 21:48, Thomas Petazzoni wrote:
> Le Sat, 30 Jun 2012 14:24:51 +0200,
> Arnout Vandecappelle<arnout@mind.be>  a ?crit :
>
>>    However, given that this will only appear in BR-2012.08 at the earliest,
>> and that the native RPC is on the way out anyway, maybe we can keep it
>> even simpler and remove the BR2_TOOLCHAIN_HAS_NATIVE_RPC option
>> completely.  Just replace all 'depends on BR2_INET_RPC' with
>> 'select BR2_PACKAGE_LIBTIRPC'.  The only users who are aversely affected
>> by that are people using a pre-2.14 glibc toolchain, because now they'll
>> get 100K of redundant library.  But I guess glibc users don't care much
>> about a mere 100K of rootfs size.
>
> Replacing "depends on BR2_INET_RPC" by "select BR2_PACKAGE_LIBTIRPC"
> means that uClibc users will be forced to use libtirpc, while they
> probably wanted to keep using the internal uClibc RPC code. I don't
> think it's a good idea to do this.

  My bad, I didn't know uClibc had native RPC code.

  Then I would go for option (2) from your original mail.  Or the following
variation:

config BR2_RPC
	bool
	select BR2_PACKAGE_LIBTIRPC if !BR2_TOOLCHAIN_HAS_NATIVE_RPC

config BR2_TOOLCHAIN_HAS_NATIVE_RPC
	bool

config BR2_PACKAGE_FOO
	select BR2_RPC

  We probably also want an rpc target for the .mk files:

FOO_DEPENDENCIES += rpc

# (in some toolchain .mk file)
.PHONY: rpc

# (in libtirpc .mk file)
ifeq ($(BR2_PACKAGE_LIBTIRPC),y)
rpc: libtirpc
endif

  Actually, I'm not 100% sure if this scheme is a good idea because it adds
the phony rpc target to TARGETS.


  Oh and I would also not exclude libtirpc if the toolchain has native RPC,
unless there really is a conflict.  I can imagine that it makes sense to
want the extra features of libtirpc even with a 2.13 glibc.


  Regards,
  Arnout
-- 
Arnout Vandecappelle                               arnout at mind be
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Essensium/Mind                                     http://www.mind.be
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