[oe] [meta-oe][PATCH] libeigen: allow empty packages

[Vyacheslav Yurkov]

Hi Khem,
It's a build time failure. libeigen is header-only library.
All headers go into dev package, therefore the main package is empty. 
Dependency on the dev package doesn't work, AFAIK, so you have to allow 
empty package for build to succeed. Otherwise I get an error that empty 
packages are not allowed. I reproduced it when I built ceres-solver 
recipe (although I don't use the latest poky). Perhaps I'm missing 
something and it has been solved in the latest poky?

Vyacheslav

On 02/10/2018 17:14, Khem Raj wrote:
> Hi Vyacheslav
>
> On Tue, Oct 2, 2018 at 1:33 AM Vyacheslav Yurkov <uvv.mail at gmail.com> wrote:
>> When libeigen is used as a dependency (e.g. in ceres library),
>> the build is broken because empty packages are not constructed be default
>>
> can you explain a bit more on whats going on? it is a runtime failure
> or build time failure.
>
>> Signed-off-by: Vyacheslav Yurkov <uvv.mail at gmail.com>
>> ---
>>   meta-oe/recipes-support/libeigen/libeigen_3.3.4.bb | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/meta-oe/recipes-support/libeigen/libeigen_3.3.4.bb b/meta-oe/recipes-support/libeigen/libeigen_3.3.4.bb
>> index 31a42a9d6..a59320655 100644
>> --- a/meta-oe/recipes-support/libeigen/libeigen_3.3.4.bb
>> +++ b/meta-oe/recipes-support/libeigen/libeigen_3.3.4.bb
>> @@ -18,3 +18,4 @@ FILES_${PN}-dev = "${includedir} ${datadir}/eigen3/cmake ${datadir}/cmake/Module
>>   # ${PN} is empty so we need to tweak -dev and -dbg package dependencies
>>   RDEPENDS_${PN}-dev = ""
>>   RRECOMMENDS_${PN}-dbg = "${PN}-dev (= ${EXTENDPKGV})"
>> +ALLOW_EMPTY_${PN} = "1"
>> --
>> 2.19.0
>>
>> --
>> _______________________________________________