[OE-core] SDK and external toolchain

[Chris Larson]

On Thu, Jul 26, 2012 at 9:37 AM, Mark Hatle <mark.hatle at windriver.com> wrote:
>> index 44284c3..f5fd4d7 100644
>> --- a/meta/classes/toolchain-scripts.bbclass
>> +++ b/meta/classes/toolchain-scripts.bbclass
>> @@ -136,7 +136,7 @@ toolchain_create_sdk_env_script_for_installer () {
>>   #we get the cached site config in the runtime
>>   TOOLCHAIN_CONFIGSITE_NOCACHE = "${@siteinfo_get_files(d, True)}"
>>   TOOLCHAIN_CONFIGSITE_SYSROOTCACHE =
>> "${STAGING_DATADIR}/${TARGET_SYS}_config_site.d"
>> -TOOLCHAIN_NEED_CONFIGSITE_CACHE = "${TCLIBC} ncurses"
>> +TOOLCHAIN_NEED_CONFIGSITE_CACHE = "ncurses"
>
>
> That is incorrect.. the CONFIGSITE_CACHE should be generated for the TCLIBC.
> If you don't do that, then you will be running the same configure steps --
> looking for basic glibc information over and over and over, causing a fairly
> expensive performance penalty.

No, he's right, this is a bug in toolchain-scripts.bbclass. We could
work around it in the recipe via RPROVIDES_${PN}, but
TOOLCHAIN_NEED_CONFIGSITE_CACHE feeds directly into task 'depends', so
it's pulling in ${TCLIBC} explicitly rather than the more accurate
'virtual/libc'.
-- 
Christopher Larson