[PATCH] package.py: Add Requires.private field in process_pkgconfig

[Sreejith Ravi <sreejith.ravi087@gmail.com>]

Currently, the process_pkgconfig() only handles the "Requires" key
field from the .pc file and ignores the "Requires.private" field while
generating the dev dependency chain. This results in a broken dependency
list and requires the installation of recommended packages to resolve
the build dependencies when using the dev IPKs. This increases the
hard disk space usage and download time and installs many unnecessary
packages as part of the recommendations.

This patch ensures that the "Requires.private" field is also considered
when creating the dependency list for the dev IPKs. With this, the dev
IPK will have the proper dependencies listed, eliminating the need to
install recommended packages to resolve the build time dependencies.

Example: usr/lib/pkgconfig/libical.pc
----------
Libs: -L${libdir} -lical -licalss -licalvcal
Libs.private: -lpthread
Requires.private: icu-i18n
----------
Depends field generated for libical-dev
Depends: glib-2.0-dev, libical (= 3.0.7-r0)
------------

When trying to resolve the build time dependency with libical
package using “-dev” ipk generated, it will throw the below error.
-----------
Package icu-i18n was not found in the pkg-config search path.
Perhaps you should add the directory containing `icu-i18n.pc'
to the PKG_CONFIG_PATH environment variable
Package 'icu-i18n', required by 'libical', not found
-----------

This patch will fix the broken dependency list.

-------
libical-dev depends field generated with this patch
Depends: glib-2.0-dev, icu-dev, libical (= 3.0.7-r0)
-------

Other examples of packages generated with broken dev dependency.

libflac-dev : https://packages.debian.org/sid/libflac-dev
Without patch:
Depends: flac (= 1.3.3-r0), libflac, libflac++
with patch:
Depends: flac (= 1.3.3-r0), libflac, libflac++, libogg-dev

libglib2.0-dev : https://packages.debian.org/buster/libglib2.0-dev
without patch:
Depends: libffi-dev, libglib-2.0-0 (= 1:2.62.6-r0), libpcre-dev
with patch:
Depends: libffi-dev, libglib-2.0-0 (= 1:2.62.6-r0), libpcre-dev,
         util-linux-dev, zlib-dev

Signed-off-by: Sreejith Ravi <sreejith.ravi087@gmail.com>
---
 meta/lib/oe/package.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/lib/oe/package.py b/meta/lib/oe/package.py
index d1303f32bf..e6b46a0dc5 100644
--- a/meta/lib/oe/package.py
+++ b/meta/lib/oe/package.py
@@ -1853,7 +1853,7 @@ def process_pkgconfig(pkgfiles, d):
                         if m:
                             hdr = m.group(1)
                             exp = pd.expand(m.group(2))
-                            if hdr == 'Requires':
+                            if hdr == 'Requires' or hdr == 'Requires.private':
                                 pkgconfig_needed[pkg] += exp.replace(',', ' ').split()
                                 continue
                         m = var_re.match(l)
-- 
2.34.1