[OE-core] [PATCHv3 4/4] cmake.bbclass: allow cmake to find hosttools

[Pascal Bach]

Currently the generated toolchain file is unable to find hosttools as they
do not appear in the search paths.

Just adding HOSTTOOLS_DIR is not enough as binaries are located directly under
${HOSTTOOLS_DIR}. Like ${HOSTTOOLS_DIR}/git for example.
CMake however only searches in [s]bin sub directories of the paths specified in
CMAKE_FIND_ROOT_PATH. Explicitly adding / to CMAKE_SYSTEM_PROGRAM_PATH makes
CMake look in the right location.

Signed-off-by: Pascal Bach <pascal.bach at siemens.com>
---
 meta/classes/cmake.bbclass | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/meta/classes/cmake.bbclass b/meta/classes/cmake.bbclass
index 0ef63795eb..c8a079c417 100644
--- a/meta/classes/cmake.bbclass
+++ b/meta/classes/cmake.bbclass
@@ -89,7 +89,7 @@ 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} ${STAGING_DIR_NATIVE} ${CROSS_DIR} ${OECMAKE_PERLNATIVE_DIR} ${OECMAKE_EXTRA_ROOT_PATH} ${EXTERNAL_TOOLCHAIN} ${HOSTTOOLS_DIR})
 set( CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ${OECMAKE_FIND_ROOT_PATH_MODE} )
 set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ${OECMAKE_FIND_ROOT_PATH_MODE} )
 set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ${OECMAKE_FIND_ROOT_PATH_MODE} )
@@ -108,6 +108,10 @@ list(APPEND CMAKE_MODULE_PATH "${STAGING_DATADIR}/cmake/Modules/")
 # add for non /usr/lib libdir, e.g. /usr/lib64
 set( CMAKE_SYSTEM_LIBRARY_PATH ${libdir} ${base_libdir})
 
+# by default CMake only looks in [s]bin subdirectories of CMAKE_FIND_ROOT_PATH
+# adding / makes CMake look for binaries in hosttools too.
+set( CMAKE_SYSTEM_PROGRAM_PATH /)
+
 # avoid treating imports as system includes
 set( CMAKE_NO_SYSTEM_FROM_IMPORTED ON)
 
-- 
2.11.0