[Buildroot] [PATCH] toolchain: add support for glibc

Arnout Vandecappelle arnout at mind.be
Thu Aug 22 23:26:58 UTC 2013


On 22/08/13 23:26, Thomas Petazzoni wrote:
> Dear Arnout Vandecappelle,
>
> On Wed, 21 Aug 2013 23:45:06 +0200, Arnout Vandecappelle wrote:
>> On 18/08/13 19:36, Thomas Petazzoni wrote:
>>> The support for eglibc 2.17 was added to the internal toolchain
>>> backend for 2013.08. This commit now adds glibc 2.18 support to the
>>> internal toolchain backend. The building procedure is very similar to
>>> the one of eglibc, with a few differences, but the two are kept
>>> separate for now.
>>
>>    I'm not sure if that's a good idea... Will merging them later be easier?
>
> I don't know for sure, but the package aren't that complex, so I don't
> think merging would be very difficult.
>
> If I had to merge them, where should I put the common code?

  I was thinking to have just one glibc package, with a choice to select 
eglibc or glibc.

>
>> [snip]
>>> +define GLIBC_CONFIGURE_CMDS
>>> +	mkdir -p $(@D)/build
>>> +	# Do the configuration
>>> +	(cd $(@D)/build; \
>>> +		$(TARGET_CONFIGURE_OPTS) \
>>> +		CFLAGS="-O2 $(GLIBC_EXTRA_CFLAGS)" CPPFLAGS="" \
>>
>>    The -O2 was required for eglibc. Why do we have it here as well?
>
> I believe yes. At least, Crosstool-NG does it, AFAIK. The glibc and
> eglibc code base are very very similar, so it wouldn't surprise me that
> the same 'constraint' applies on both.
>
>> [snip]
>>> +ifeq ($(BR2_PACKAGE_GDB_SERVER),y)
>>> +GLIBC_LIBS_LIB += libthread_db.so
>>> +endif
>>
>>    Shouldn't this lib be installed as well for a gdb without gdbserver?
>> I.e., shouldn't the condition be ifeq ($(BR2_PACKAGE_GDB),y)?
>
> That's a good question, I don't know. At the moment, the ct-ng backend,
> the external backend and the eglibc .mk file all copy libthread_db.so
> when gdbserver is enabled.

  To be tested but it'd surprise me if gdb didn't need it.


  Regards,
  Arnout


-- 
Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
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