[PATCH] cmake.bbclass: Exclude native sysroot from CMAKE_FIND_ROOT_PATH

[Khem Raj <raj.khem@gmail.com>]

This has been cause of issue where we were getting both usr/include
dirs ( from target as well as native sysroot) added to compiler
flags.

CXX_INCLUDES in final flags.cmake would include
-I<target-sysroot>/usr/include -I<native-sysroot>/usr/include
most of the time it would work since headers are mostly
common but netflix package failed to compile since one of
the headers was including curl headers which it could not
find in target sysroot and it went to next include path
and found it in native sysroot which is not what we want
when doing cross compile.

As per https://cmake.org/Wiki/CMake_Cross_Compiling
never search for programs in target sysroot but search
for packages,libs,includes only.

Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 meta/classes/cmake.bbclass | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/meta/classes/cmake.bbclass b/meta/classes/cmake.bbclass
index 3e762de..3e8df37 100644
--- a/meta/classes/cmake.bbclass
+++ b/meta/classes/cmake.bbclass
@@ -25,6 +25,7 @@ OECMAKE_PERLNATIVE_DIR ??= ""
 OECMAKE_EXTRA_ROOT_PATH ?= ""
 
 OECMAKE_FIND_ROOT_PATH_MODE_PROGRAM = "ONLY"
+OECMAKE_FIND_ROOT_PATH_MODE_PROGRAM_class-target = "NEVER"
 OECMAKE_FIND_ROOT_PATH_MODE_PROGRAM_class-native = "BOTH"
 
 EXTRA_OECMAKE_append = " ${PACKAGECONFIG_CONFARGS}"
@@ -60,7 +61,7 @@ set( CMAKE_CXX_LINK_FLAGS "${OECMAKE_CXX_LINK_FLAGS}" CACHE STRING "LDFLAGS" )
 
 # only search in the paths provided so cmake doesnt pick
 # up libraries and tools from the native build machine
-set( CMAKE_FIND_ROOT_PATH ${STAGING_DIR_HOST} ${STAGING_DIR_NATIVE} ${CROSS_DIR} ${OECMAKE_PERLNATIVE_DIR} ${OECMAKE_EXTRA_ROOT_PATH} ${EXTERNAL_TOOLCHAIN})
+set( CMAKE_FIND_ROOT_PATH ${STAGING_DIR_HOST} ${CROSS_DIR} ${OECMAKE_PERLNATIVE_DIR} ${OECMAKE_EXTRA_ROOT_PATH} ${EXTERNAL_TOOLCHAIN})
 set( CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY )
 set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ${OECMAKE_FIND_ROOT_PATH_MODE_PROGRAM} )
 set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
-- 
2.10.1