classes, conf: Exclude native and nativesdk recipes from libc specific override

Based on suggestions from RP

libc-uclibc and libc-glibc overrides are for denoting
system C library in use on the target and not for the
host therefore we make sure that the override only takes
effect for target recipes only.

(From OE-Core rev: 6e2b53f47da0e97271fb51b281d24da1e1d549cc)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/native.bbclass

@@ -92,6 +92,9 @@ EXTRA_NATIVE_PKGCONFIG_PATH ?= ""
 PKG_CONFIG_PATH .= "${EXTRA_NATIVE_PKGCONFIG_PATH}"
 PKG_CONFIG_SYSROOT_DIR = ""
 
+# we dont want libc-uclibc or libc-glibc to kick in for native recipes
+LIBCOVERRIDE = ""
+
 PATH =. "${COREBASE}/scripts/native-intercept:"
 
 python native_virtclass_handler () {

meta/classes/nativesdk.bbclass

@@ -6,6 +6,9 @@ EXCLUDE_FROM_WORLD = "1"
 
 STAGING_BINDIR_TOOLCHAIN = "${STAGING_DIR_NATIVE}${bindir_native}/${SDK_ARCH}${SDK_VENDOR}-${SDK_OS}"
 
+# we dont want libc-uclibc or libc-glibc to kick in for nativesdk recipes
+LIBCOVERRIDE = ""
+
 #
 # Update PACKAGE_ARCH and PACKAGE_ARCHS
 #

meta/conf/distro/include/tclibc-eglibc.inc

@@ -5,7 +5,8 @@
 LIBCEXTENSION = "${@['', '-gnu'][(d.getVar('ABIEXTENSION', True) or '') != '']}"
 
 # Add glibc overrides to the overrides for eglibc.
-OVERRIDES .= ":libc-glibc"
+LIBCOVERRIDE = ":libc-glibc"
+OVERRIDES .= "${LIBCOVERRIDE}"
 
 PREFERRED_PROVIDER_virtual/libiconv ?= "eglibc"
 PREFERRED_PROVIDER_virtual/libiconv-nativesdk ?= "eglibc-nativesdk"

meta/conf/distro/include/tclibc-uclibc.inc

@@ -5,7 +5,8 @@
 LIBCEXTENSION = "-uclibc"
 
 # Add uclibc overrides to the overrides.
-OVERRIDES =. "libc-uclibc:"
+LIBCOVERRIDE = ":libc-uclibc"
+OVERRIDES .= "${LIBCOVERRIDE}"
 
 PREFERRED_PROVIDER_virtual/libc = "uclibc"
 PREFERRED_PROVIDER_virtual/libiconv ?= "libiconv"