mesa: double check for eglplatform.h

Even if 'egl' is in PACKAGECONFIG, mesa egl support
can be disabled explicitly (changing configure flags
using a .bbappend, for example).
On dora, meta-fsl-arm is an example of this kind.
On master there are no known cases, and we should
encourge package configuration through PACKAGECONFIG.

This patch adds another check for the existence
of eglplatform.h before 'sed' can alter it.

Signed-off-by: Valentin Popa <valentin.popa@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
package.bbclass: add getter of additional metadata

Two variables are searched for value of additional package metadata:

  * PACKAGE_ADD_METADATA_<PKGTYPE>
  * PACKAGE_ADD_METADATA

First found variable with defined value wins.

<PKGTYPE> is a parameter of getter and expected to be a distinct name
of specific package type. For example: 'DEB' or 'RPM'.

Variable can contain multiple [one-line] metadata fields, separated by
literal sequence '\n'. Separator can be redefined through variable flag
'separator'. Getter returns found value with separator replaced with
newline character.

As side-effect, searched variables acquired flags 'type' (equals to
'list') and 'separator'.

Signed-off-by: Leonid Borisenko <ive.found@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
package_{ipk, deb, rpm}.bbclass: support additional user-defined metadata

Additional metadata from user-defined variable is written into
control/spec file of binary package.

Three variables are searched for adiitional package metadata:

  * PACKAGE_ADD_METADATA_<PKGTYPE>_<PN>
  * PACKAGE_ADD_METADATA_<PKGTYPE>
  * PACKAGE_ADD_METADATA

First found variable with defined value wins.

<PN> is a package name. <PKGTYPE> is a distinct name of specific
package type:

  * IPK for .ipk packages
  * DEB for .deb packages
  * RPM for .rpm packages

Variable can contain multiple [one-line] metadata fields separated by
literal sequence '\n'. Separator can be redefined through variable flag
'separator'. In package control/spec file separator is replaced by
newline character.

Signed-off-by: Leonid Borisenko <ive.found@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
package.bbclass: move reading shlibs providers to separate function

* prepare for reading shlibs providers only from dependency tree of
  current recipe

[YOCTO #4628]

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
package.bbclass: show warning when package is trying to provide already provided shlib

* move read_shlib_providers before registering package as provider
  and don't change provider if it already exists, show warning instead

[YOCTO #4628]

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
package.bbclass: add SHLIBSSEARCHDIRS to define where to search for shlib providers

* when package contains some files matching "^.*\.so", but in directory
  not default linker search paths (e.g. /opt/package/bundled-lib/libfoo.so)
  don't register it as libfoo provider, because it's possible that there
  is different package providing libfoo.so in ${libdir} and that would
  be better shlib provider for other packages to depend on
* recipes providing libs intentionally in some other directory can
  define own SHLIBSSEARCHDIRS value

[YOCTO #4628]

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
package.bbclass: Don't search for prividers of PRIVATE_LIBS

* split PRIVATE_LIBS and don't use find(), so that libfoo cannot be
  found in PRIVATE_LIBS = "libfoobar"

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
package.bbclass: Show which files require given dependency in debug output

* when log.do_package shows some unexpected dependency, people usually
  need to grep package directory to find which binary was creating that
  dependency, show it directly in the debug output

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
gtk+: Add PACKAGECONFIG for directfb

* building without x11 doesn't work, because it sets default
  gdkbackend to x11 and then requires cairo-xlib to be available

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>