bitbake.conf/native/nativesdk: Set PKG_CONFIG_SYSTEM_ at top level

Setting PKG_CONFIG_SYSTEM_{HEADERS/INCLUDE}_PATH for nativesdk isn't
enough, we also need to deal with multlib cases where libdir from
pkg-config-native isn't correct. Native builds are about the only
case where this variable shouldn't be set.

Therefore move the code from nativesdk to bitbake.conf and unexport it
in the native case.

(From OE-Core rev: 46c48c26ab1916e2dfb841d74a0f2a58d8b2b870)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/native.bbclass

@@ -106,6 +106,8 @@ PKG_CONFIG_DIR = "${libdir}/pkgconfig"
 EXTRA_NATIVE_PKGCONFIG_PATH ?= ""
 PKG_CONFIG_PATH .= "${EXTRA_NATIVE_PKGCONFIG_PATH}"
 PKG_CONFIG_SYSROOT_DIR = ""
+PKG_CONFIG_SYSTEM_LIBRARY_PATH[unexport] = "1"
+PKG_CONFIG_SYSTEM_INCLUDE_PATH[unexport] = "1"
 
 # we dont want libc-uclibc or libc-glibc to kick in for native recipes
 LIBCOVERRIDE = ""

meta/classes/nativesdk.bbclass

@@ -60,8 +60,6 @@ sbindir = "${bindir}"
 
 export PKG_CONFIG_DIR = "${STAGING_DIR_HOST}${libdir}/pkgconfig"
 export PKG_CONFIG_SYSROOT_DIR = "${STAGING_DIR_HOST}"
-export PKG_CONFIG_SYSTEM_LIBRARY_PATH = "${base_libdir}:${libdir}"
-export PKG_CONFIG_SYSTEM_INCLUDE_PATH = "${includedir}"
 
 python nativesdk_virtclass_handler () {
     pn = e.data.getVar("PN", True)

meta/conf/bitbake.conf

@@ -647,6 +647,8 @@ export PKG_CONFIG_PATH = "${PKG_CONFIG_DIR}:${STAGING_DATADIR}/pkgconfig"
 export PKG_CONFIG_LIBDIR = "${PKG_CONFIG_DIR}"
 export PKG_CONFIG_SYSROOT_DIR = "${STAGING_DIR_HOST}"
 export PKG_CONFIG_DISABLE_UNINSTALLED = "yes"
+export PKG_CONFIG_SYSTEM_LIBRARY_PATH = "${base_libdir}:${libdir}"
+export PKG_CONFIG_SYSTEM_INCLUDE_PATH = "${includedir}"
 
 ###
 ### Config file processing