[oe] Understanding recipes vs packages

[Xu, Dongxiao]

Hi Charles,

> -----Original Message-----
> From: openembedded-devel-bounces at lists.openembedded.org
> [mailto:openembedded-devel-bounces at lists.openembedded.org] On Behalf Of
> Charles Manning
> Sent: Monday, November 07, 2011 11:32 AM
> To: openembedded-devel at lists.openembedded.org
> Subject: [oe] Understanding recipes vs packages
> 
> Hello
> 
> Something very weird is going on with some changes I have made recently to a
> custom image I am building.
> 
> For some reason I was getting libpng12 built and now that no longer happens.
> 
> In debugging this I've been doing things that now stump me.
> 
> From my understanding, a recipe can build multiple different packages.
> For example libpng.inc has the following in it:

Yes, it is correct.

> 
> PACKAGES =+ "${PN}12-dbg ${PN}12 ${PN}12-dev"
> 
> FILES_${PN}12-dbg += "${libdir}/libpng12*.dbg"
> FILES_${PN}12 = "${libdir}/libpng12.so.*"
> FILES_${PN}12-dev = "${libdir}/libpng12.* ${includedir}/libpng12
> ${libdir}/pkgconfig/libpng12.pc"
> FILES_${PN} = "${libdir}/lib*.so.*"
> FILES_${PN}-dev = "${includedir} ${libdir}/lib*.so ${libdir}/*.la \
> 		${libdir}/*.a ${libdir}/pkgconfig \
> 		${datadir}/aclocal ${bindir} ${sbindir}"
> 
> 
> Does that mean I should be able to build  libgpng12 as follows:
> 
> bitbake libpng12

No, package name could not be passed to bitbake as a parameter.

Bitbake can accept a recipe name as its parameter, and it will process tasks like "do_fetch", "do_unpack", ..., "do_package", etc. for that recipe. In the above case, libpng12 will be generated in do_package task, and then it will be archived into rpm/ipk/deb package formats.

Try to run "bitbake libpng" and see if libpng12 is generated.

Thanks,
Dongxiao

> 
> Thanks
> 
> Charles
> 
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