CMake: build libmetal for Zephyr

Enable buildling libmetal for Zephyr

Here is the step to build libmetal for Zephyr:

 % export ZEPHRY_GCC_VARIANT=zephyr
 % export ZEPHRY_SDK_INSTALL_DIR=<where Zephyr SDK is installed>
 % source <git_clone_zephyr_project_source_root>/zephyr-env.sh

 % cmake <libmetal_source_root> -DWITH_ZEPHYR=on -DBOARD=qemu_cortex_m3
 % make VERBOSE=1 all

libmetal will be generated in "<BUILD_DIR>/lib/libmetal.a"

Signed-off-by: Wendy Liang <jliang@xilinx.com>

Author: wjliang

CMakeLists.txt

@@ -5,6 +5,7 @@ list (APPEND CMAKE_MODULE_PATH
       "${CMAKE_SOURCE_DIR}/cmake/modules"
       "${CMAKE_SOURCE_DIR}/cmake/platforms")
 
+include (syscheck)
 project (metal C)
 
 include (CheckIncludeFiles)
@@ -20,6 +21,7 @@ endforeach()
 enable_testing ()
 
 add_subdirectory (lib)
+
 if (WITH_TESTS)
   add_subdirectory (test)
 endif (WITH_TESTS)

cmake/depends.cmake

@@ -24,7 +24,7 @@ if ("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
 
 else ("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
 
-  # TODO: fix for find_path() to detect stdatomic.h 
+  # TODO: fix for find_path() to detect stdatomic.h
   # find_path (HAVE_STDATOMIC_H stdatomic.h)
   set (_saved_cmake_required_flags ${CMAKE_REQUIRED_FLAGS})
   set (CMAKE_REQUIRED_FLAGS "-c" CACHE STRING "")

cmake/syscheck.cmake

@@ -0,0 +1,12 @@
+# use "Generic" as CMAKE_SYSTEM_NAME
+
+if (WITH_ZEPHYR)
+  set (CMAKE_SYSTEM_NAME "Generic"             CACHE STRING "")
+  string (TOLOWER "Zephyr"                PROJECT_SYSTEM)
+  string (TOUPPER "Zephyr"                PROJECT_SYSTEM_UPPER)
+  set(IS_TEST 1)
+  include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+  if (CONFIG_CPU_CORTEX_M)
+    set (MACHINE "cortexm" CACHE STRING "")
+  endif (CONFIG_CPU_CORTEX_M)
+endif (WITH_ZEPHYR)

lib/CMakeLists.txt

@@ -59,35 +59,41 @@ if (WITH_DEFAULT_LOGGER)
   add_definitions (-DDEFAULT_LOGGER_ON)
 endif (WITH_DEFAULT_LOGGER)
 
-# Build a shared library if so configured.
-if (WITH_SHARED_LIB)
-  set (_lib ${PROJECT_NAME}-shared)
-  add_library (${_lib} SHARED ${_sources})
-  target_link_libraries (${_lib} ${_deps})
-  install (TARGETS ${_lib} LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
-  if (PROJECT_EC_FLAGS)
-    string(REPLACE " " ";" _ec_flgs ${PROJECT_EC_FLAGS})
-    target_compile_options (${_lib} PUBLIC ${_ec_flgs})
-  endif (PROJECT_EC_FLAGS)
-  set_target_properties (${_lib} PROPERTIES
-    OUTPUT_NAME       "${PROJECT_NAME}"
-    VERSION           "${PROJECT_VER}"
-    SOVERSION         "${PROJECT_VER_MAJOR}"
-  )
-endif (WITH_SHARED_LIB)
+if (WITH_ZEPHYR)
+  zephyr_library_named(metal)
+  add_dependencies(metal offsets_h)
+  target_sources (metal PRIVATE ${_sources})
+else (WITH_ZEPHYR)
+  # Build a shared library if so configured.
+  if (WITH_SHARED_LIB)
+    set (_lib ${PROJECT_NAME}-shared)
+    add_library (${_lib} SHARED ${_sources})
+    target_link_libraries (${_lib} ${_deps})
+    install (TARGETS ${_lib} LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
+    if (PROJECT_EC_FLAGS)
+      string(REPLACE " " ";" _ec_flgs ${PROJECT_EC_FLAGS})
+      target_compile_options (${_lib} PUBLIC ${_ec_flgs})
+    endif (PROJECT_EC_FLAGS)
+    set_target_properties (${_lib} PROPERTIES
+      OUTPUT_NAME       "${PROJECT_NAME}"
+      VERSION           "${PROJECT_VER}"
+      SOVERSION         "${PROJECT_VER_MAJOR}"
+    )
+  endif (WITH_SHARED_LIB)
 
-# Build a static library if so configured.
-if (WITH_STATIC_LIB)
-  set (_lib ${PROJECT_NAME}-static)
-  add_library (${_lib} STATIC ${_sources})
-  install (TARGETS ${_lib} ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
-  if (PROJECT_EC_FLAGS)
-    string(REPLACE " " ";" _ec_flgs ${PROJECT_EC_FLAGS})
-    target_compile_options (${_lib} PUBLIC ${_ec_flgs})
-  endif (PROJECT_EC_FLAGS)
-  set_target_properties (${_lib} PROPERTIES
-    OUTPUT_NAME       "${PROJECT_NAME}"
-  )
-endif (WITH_STATIC_LIB)
+  # Build a static library if so configured.
+  if (WITH_STATIC_LIB)
+    set (_lib ${PROJECT_NAME}-static)
+    add_library (${_lib} STATIC ${_sources})
+    install (TARGETS ${_lib} ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+    if (PROJECT_EC_FLAGS)
+      string(REPLACE " " ";" _ec_flgs ${PROJECT_EC_FLAGS})
+      target_compile_options (${_lib} PUBLIC ${_ec_flgs})
+    endif (PROJECT_EC_FLAGS)
+    set_target_properties (${_lib} PROPERTIES
+      OUTPUT_NAME       "${PROJECT_NAME}"
+    )
+  endif (WITH_STATIC_LIB)
+endif (WITH_ZEPHYR)
 
 # vim: expandtab:ts=2:sw=2:smartindent