[PATCH 06/19] cmake-native.bbclass: Abstraction to use cmake with native toolchains

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

This would enable using OE built native toolchain e.g. clang-native
to build cmake based native packages

Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 meta/classes-recipe/cmake-native.bbclass | 56 ++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 meta/classes-recipe/cmake-native.bbclass

diff --git a/meta/classes-recipe/cmake-native.bbclass b/meta/classes-recipe/cmake-native.bbclass
new file mode 100644
index 00000000000..116cdd1a999
--- /dev/null
+++ b/meta/classes-recipe/cmake-native.bbclass
@@ -0,0 +1,56 @@
+# Native C/C++ compiler (without cpu arch/tune arguments)
+OECMAKE_NATIVE_C_COMPILER ?= "`echo ${BUILD_CC} | sed 's/^\([^ ]*\).*/\1/'`"
+OECMAKE_NATIVE_CXX_COMPILER ?= "`echo ${BUILD_CXX} | sed 's/^\([^ ]*\).*/\1/'`"
+OECMAKE_NATIVE_AR ?= "${BUILD_AR}"
+OECMAKE_NATIVE_RANLIB ?= "${BUILD_RANLIB}"
+OECMAKE_NATIVE_NM ?= "${BUILD_NM}"
+
+# Native compiler flags
+OECMAKE_NATIVE_C_FLAGS ?= "${BUILD_CC_ARCH} ${BUILD_CFLAGS}"
+OECMAKE_NATIVE_CXX_FLAGS ?= "${BUILD_CC_ARCH} ${BUILD_CXXFLAGS}"
+OECMAKE_NATIVE_C_FLAGS_RELEASE ?= "-DNDEBUG"
+OECMAKE_NATIVE_CXX_FLAGS_RELEASE ?= "-DNDEBUG"
+OECMAKE_NATIVE_C_LINK_FLAGS ?= "${BUILD_CC_ARCH} ${BUILD_CPPFLAGS} ${BUILD_LDFLAGS}"
+OECMAKE_NATIVE_CXX_LINK_FLAGS ?= "${BUILD_CC_ARCH} ${BUILD_CXXFLAGS} ${BUILD_LDFLAGS}"
+BUILD_CXXFLAGS += "${BUILD_CC_ARCH}"
+BUILD_CFLAGS += "${BUILD_CC_ARCH}"
+
+do_generate_native_toolchain_file() {
+        cat > ${WORKDIR}/toolchain-native.cmake <<EOF
+set( CMAKE_SYSTEM_NAME `echo ${BUILD_OS} | sed -e 's/^./\u&/' -e 's/^\(Linux\).*/\1/'` )
+set( CMAKE_SYSTEM_PROCESSOR ${BUILD_ARCH} )
+set( CMAKE_C_COMPILER ${OECMAKE_NATIVE_C_COMPILER} )
+set( CMAKE_CXX_COMPILER ${OECMAKE_NATIVE_CXX_COMPILER} )
+set( CMAKE_ASM_COMPILER ${OECMAKE_NATIVE_C_COMPILER} )
+set( CMAKE_AR ${OECMAKE_NATIVE_AR} CACHE FILEPATH "Archiver" )
+set( CMAKE_RANLIB ${OECMAKE_NATIVE_RANLIB} CACHE FILEPATH "Archive Indexer" )
+set( CMAKE_NM ${OECMAKE_NATIVE_NM} CACHE FILEPATH "Symbol Lister" )
+set( CMAKE_C_FLAGS "${OECMAKE_NATIVE_C_FLAGS}" CACHE STRING "CFLAGS" )
+set( CMAKE_CXX_FLAGS "${OECMAKE_NATIVE_CXX_FLAGS}" CACHE STRING "CXXFLAGS" )
+set( CMAKE_ASM_FLAGS "${OECMAKE_NATIVE_C_FLAGS}" CACHE STRING "ASM FLAGS" )
+set( CMAKE_C_FLAGS_RELEASE "${OECMAKE_NATIVE_C_FLAGS_RELEASE}" CACHE STRING "Additional CFLAGS for release" )
+set( CMAKE_CXX_FLAGS_RELEASE "${OECMAKE_NATIVE_CXX_FLAGS_RELEASE}" CACHE STRING "Additional CXXFLAGS for release" )
+set( CMAKE_ASM_FLAGS_RELEASE "${OECMAKE_NATIVE_C_FLAGS_RELEASE}" CACHE STRING "Additional ASM FLAGS for release" )
+set( CMAKE_C_LINK_FLAGS "${OECMAKE_NATIVE_C_LINK_FLAGS}" CACHE STRING "LDFLAGS" )
+set( CMAKE_CXX_LINK_FLAGS "${OECMAKE_NATIVE_CXX_LINK_FLAGS}" CACHE STRING "LDFLAGS" )
+
+set( CMAKE_FIND_ROOT_PATH ${STAGING_DIR_NATIVE} )
+set( CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY )
+set( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM BOTH )
+set( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
+set( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
+
+# Use native cmake modules
+list(APPEND CMAKE_MODULE_PATH "${STAGING_DATADIR_NATIVE}/cmake/Modules/")
+
+# add for non /usr/lib libdir, e.g. /usr/lib64
+set( CMAKE_LIBRARY_PATH ${STAGING_BASE_LIBDIR_NATIVE} ${STAGING_LIBDIR_NATIVE})
+
+# add include dir to implicit includes in case it differs from /usr/include
+list(APPEND CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES ${STAGING_INCDIR_NATIVE})
+list(APPEND CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES ${STAGING_INCDIR_NATIVE})
+
+EOF
+}
+
+addtask generate_native_toolchain_file after do_patch before do_configure