[yocto] How to create and install a library in yocto -- Hello Library

Wed Sep 30 10:11:57 PDT 2015

Hi Jussie,

Thanks for your help and hints.  I was able to find a solution.

For those interested, the recipe is shown below:

 ============================

 RECIPE

 Recipe name => simplelib_0.1.1.bb

 ===========================
 DESCRIPTION = "Simple Library on yocto"
 LICENSE = "GPLv2"
 LIC_FILES_CHKSUM =
 "file://LICENSE;md5=c0b0999e102092552f1dfe93fb9b0068"

PR = "r0"

 SRC_URI = "file://simplelib.zip"
 S = "${WORKDIR}/simplelib/"

 PACKAGES = "${PN} ${PN}-dev ${PN}-dbg ${PN}-staticdev"

RDEPENDS_${PN}-staticdev = ""
RDEPENDS_${PN}-dev = ""
RDEPENDS_${PN}-dbg = ""

 do_compile(){

         ${CC} -c calc_mean.c -o calc_mean.o

         ${AR} rcs libmean.a calc_mean.o

 }

 do_install{

         install -d ${D}${libdir}

         install -m 0644 libmean.a ${D}${libdir}

 }

 =====================

At local.conf add the library as

IMAGE_INSTALL_append = "simplelib-staticdev"

=====================

Again, thanks to Jussie for the help.

Regards!

--------------------------------------------
On Wed, 9/30/15, Jussi Kukkonen <jussi.kukkonen at intel.com> wrote:

 Subject: Re: [yocto] How to create and install a library in yocto -- Hello Library
 To: "Simon Castillo" <smcas_m at yahoo.com.mx>
 Cc: "Yocto Project" <yocto at yoctoproject.org>
 Date: Wednesday, September 30, 2015, 5:08 AM

 On 30
 September 2015 at 04:28, Simon Castillo <smcas_m at yahoo.com.mx>
 wrote:
 Hello
 to all,

 I have searching for a way to include a library-only in
 yocto.  I found couple links with suggestions but I was
 unsuccessful in the to package it in the final image. 
 Reading the yocto documentation, I see a paragraph
 mentioning about static libraries but there is no
 examples.

  I will try to be precise with the hopes to find help to
 tackle this issue.

 NOTE:   Couple steps like creating a LICENSE file, crate
 the layer and update the local.conf file are omitted

 ===============================

 The problem:

 - Creating a library that it is desired to be part of the
 final image (for example core-image-base, core-image-sato).
 No application, only a library

 ==============================

 Test scenario:

 Let's say that we desire to create a simple library
 called simple lib.

 The source code is as follows (taken from this link [http://www.adp-gmbh.ch/cpp/gcc/create_lib.html],
 copied here just for convenience)

 calc_mean.c

 //#include <stdio.h>

 double mean(double a, double b) {

   return (a+b) / 2;

 }

 calc_mean.h

 double mean(double, double);

 Now we want to create a recipe that can compile, create a
 library and can be included in the final image (let's
 assume core-image-base)

 ============================

 RECIPE

 Recipe name => simplelib_0.1.0.bb

 ===========================

 DESCRIPTION = "Simple Library on yocto"

 LICENSE = "GPLv2"

 LIC_FILES_CHKSUM =
 "file://LICENSE;md5=c0b0999e102092552f1dfe93fb9b0068"

 PR = "r0"

 SRC_URI = "file://simplelib.zip"

 S = "${WORKDIR}/simplelib/"

 do_compile(){

         ${CC} -c calc_mean.c -o calc_mean.o

         ${AR} rcs libmean.a calc_mean.o

 }

 do_install{

         install -d ${D}${libdir}

         install -m 0644 libmean.a ${D}${libdir}

 }

 =====================

 Test results for RECIPE:

 $ bitbake simplelib

 RUNS without any problem.  The files generated are shown
 below

 ├── configure.sstate

 ├── deploy-ipks

 │   └── cortexa8hf-vfp-neon

 │       ├──
 simplelib-dbg_0.1.0-r0_cortexa8hf-vfp-neon.ipk

 │       ├──
 simplelib-dev_0.1.0-r0_cortexa8hf-vfp-neon.ipk

 │       └──
 simplelib-staticdev_0.1.0-r0_cortexa8hf-vfp-neon.ipk

 ├── image

 │   └── usr

 │       └── lib

 │           └── libmean.a

 ├── license-destdir

 │   └── simplelib

 │       ├── generic_GPLv2

 │       └── LICENSE

 ├── package

 │   └── usr

 │       └── lib

 │           └── libmean.a

 ├── packages-split

 │   ├── simplelib

 │   ├── simplelib-dbg

 │   ├── simplelib-dev

 │   ├── simplelib-doc

 │   ├── simplelib-locale

 │   └── simplelib-staticdev

 │       └── usr

 │           └── lib

 │               └── libmean.a

 ├──
 pkgdata

 │   ├── runtime

 │   │   ├── simplelib

 │   │   ├── simplelib-dbg

 │   │   ├── simplelib-dbg.packaged

 │   │   ├── simplelib-dev

 │   │   ├── simplelib-dev.packaged

 │   │   ├── simplelib-doc

 │   │   ├── simplelib-locale

 │   │   ├── simplelib-staticdev

 │   │   └── simplelib-staticdev.packaged

 │   ├── runtime-reverse

 │   │   ├── simplelib-dbg ->
 ../runtime/simplelib-dbg

 │   │   ├── simplelib-dev ->
 ../runtime/simplelib-dev

 │   │   └── simplelib-staticdev ->
 ../runtime/simplelib-staticdev

 │   ├── runtime-rprovides

 │   ├── shlibs2

 │   └── simplelib

 ├── pseudo

 │   ├── files.db

 │   ├── logs.db

 │   ├── pseudo.lock

 │   ├── pseudo.log

 │   ├── pseudo.pid

 │   └── pseudo.socket

 ├── simplelib

 │   ├── calc_mean.c

 │   ├── calc_mean.h

 │   ├── calc_mean.o

 │   ├── libmean.a

 │   └── LICENSE

 ├── sysroot-destdir

 │   ├── sysroot-providers

 │   │   └── simplelib

 │   └── usr

 │       └── lib

 │           └── libmean.a

 ===============

 Test result to include library in the image

 $ bitbake core-image-base

 FAILS,

  * opkg_install_cmd: Cannot install package simplelib.

 ERROR: Function failed: do_rootfs

 ==============

 TRY ONE,

 Change the recipe and add RDEPENDS_${PN}-dev =
 ""  as suggested by https://lists.yoctoproject.org/pipermail/yocto/2014-September/021676.html

 FAILS, same error

  * opkg_install_cmd: Cannot install package simplelib.

 This really
 should help: your problem is probably that the actual
 simplelib package is not created (because there are no files
 to put into it), but the -dev package still RDEPENDS on it
 by default. The log file might give you more details though.
  "grep RDEPENDS pkgdata/runtime/*" in work
 directory should show what the RDEPENDS are.
 How are you adding the library to
 your image? You should be adding the package
 "simplelib-staticdev" to it (assuming you really
 only want a static .a).

 =============

 TRY TWO

 Modify recipe adding below lines (based on http://stackoverflow.com/questions/28792597/how-to-add-a-new-library-using-yocto)

 PACKAGES = "${PN} ${PN}-dev ${PN}-dbg
 ${PN}-staticdev"

 FILES_${PN} = " \

         ${libdir}/simplelib/ \

 " 
 FAILS, same error

  * opkg_install_cmd: Cannot install package simplelib.

 ===============

 This SO question was fixing a
 slightly different problem: adding any files to FILES_${PN}
 would solve your problem as well (because the ${PN} package
 would then exist) but the files you refer to do not exist so
 nothing is added... 
 I am sure that it is something
 simple and common that many have done in the past but
 unfortunately I can not find an example on how to do it. 
 Hope somebody could provide a hint on how to fix this
 problem.

 Hope
 that helps, 
 Jussi 