[PATCH v2] libxml2: make dependencies on python conditional

[Dmitry Rozhkov <dmitry.rozhkov@linux.intel.com>]

The library libxml2 can provide its own bindings for python2 in addition
to the third party python-lxml and python3-lxml packages if this
functionality is enabled in PACKAGECONFIG.

But in case the functionality is disabled there's no need to depend
on python2.

Make the dependency on python2 enabled only if the python feature
is added to PACKAGECONFIG. Also add missing run-time dependency on make
to libxml2-ptest.

Signed-off-by: Dmitry Rozhkov <dmitry.rozhkov@linux.intel.com>
---

Changes in v2:
- Set PACKAGECONFIG before it's used.
- PACKAGES is left unchanged because empty packages are not generated.

 meta/recipes-core/libxml/libxml2_2.9.4.bb | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/meta/recipes-core/libxml/libxml2_2.9.4.bb b/meta/recipes-core/libxml/libxml2_2.9.4.bb
index 023fe99..0c3d683 100644
--- a/meta/recipes-core/libxml/libxml2_2.9.4.bb
+++ b/meta/recipes-core/libxml/libxml2_2.9.4.bb
@@ -32,22 +32,24 @@ SRC_URI[testtar.sha256sum] = "96151685cec997e1f9f3387e3626d61e6284d4d6e66e0e440c
 
 BINCONFIG = "${bindir}/xml2-config"
 
-inherit autotools pkgconfig binconfig-disabled pythonnative ptest
+PACKAGECONFIG ??= "python \
+    ${@bb.utils.filter('DISTRO_FEATURES', 'ipv6', d)} \
+"
+PACKAGECONFIG[python] = "--with-python=${PYTHON},--without-python,python"
+PACKAGECONFIG[ipv6] = "--enable-ipv6,--disable-ipv6,"
+
+inherit autotools pkgconfig binconfig-disabled ptest
+
+inherit ${@bb.utils.contains('PACKAGECONFIG', 'python', 'pythonnative', '', d)}
 
-RDEPENDS_${PN}-ptest += "python-core"
+RDEPENDS_${PN}-ptest += "make ${@bb.utils.contains('PACKAGECONFIG', 'python', 'python-core', '', d)}"
 
-RDEPENDS_${PN}-python += "python-core"
+RDEPENDS_${PN}-python += "${@bb.utils.contains('PACKAGECONFIG', 'python', 'python-core', '', d)}"
 
 RDEPENDS_${PN}-ptest_append_libc-glibc = " glibc-gconv-ebcdic-us glibc-gconv-ibm1141"
 
 export PYTHON_SITE_PACKAGES="${PYTHON_SITEPACKAGES_DIR}"
 
-PACKAGECONFIG ??= "python \
-    ${@bb.utils.filter('DISTRO_FEATURES', 'ipv6', d)} \
-"
-PACKAGECONFIG[python] = "--with-python=${PYTHON},--without-python,python"
-PACKAGECONFIG[ipv6] = "--enable-ipv6,--disable-ipv6,"
-
 # WARNING: zlib is require for RPM use
 EXTRA_OECONF = "--without-debug --without-legacy --with-catalog --without-docbook --with-c14n --without-lzma --with-fexceptions"
 EXTRA_OECONF_class-native = "--without-legacy --without-docbook --with-c14n --without-lzma --with-zlib"
-- 
2.9.3