Add lfc.cmake (#195)

Author: erlingrj

cmake/lfc.cmake

@@ -0,0 +1,69 @@
+cmake_minimum_required(VERSION 3.20.0)
+
+# Sets up default values for LF_MAIN and LOG_LEVEL which
+# can be overridden by the user, either in the main CMakeLists.txt or
+# from the command line.
+function (lf_setup)
+  if (NOT DEFINED LF_MAIN)
+    message(FATAL_ERROR "LF_MAIN must be defined to be the name of the main LF source file without the .lf extension")
+  endif()
+
+  if (NOT DEFINED LOG_LEVEL)
+    set(LOG_LEVEL "LF_LOG_LEVEL_INFO" PARENT_SCOPE)
+  endif()
+endfunction()
+
+# Run the LFC compiler on the specified LF source file, LF_SOURCE_DIR/LF_MAIN.lf. Also make the CMake configuration
+# depend on any LF source file found within LF_SOURCE_DIR. This ensures that the LFC compiler is rerun whenever any LF
+# source file changes.
+# Args:
+#   LF_SOURCE_DIR: The directory containing the LF source file.
+#   LF_MAIN: The name of the LF source file without the .lf extension.
+function(lf_run_lfc LF_SOURCE_DIR LF_MAIN)
+    # Check if the LF_SOURCE_DIR exists
+  if (NOT EXISTS ${LF_SOURCE_DIR})
+    message(FATAL_ERROR "LF source directory does not exist: ${LF_SOURCE_DIR}")
+  endif()
+
+  # Check if the LF_MAIN file exists
+  if (NOT EXISTS ${LF_SOURCE_DIR}/${LF_MAIN}.lf)
+    message(FATAL_ERROR "LF main file does not exist: ${LF_SOURCE_DIR}/${LF_MAIN}.lf")
+  endif()  
+
+  set(LFC_COMMAND $ENV{REACTOR_UC_PATH}/lfc/bin/lfc-dev ${LF_SOURCE_DIR}/${LF_MAIN}.lf -o ${CMAKE_CURRENT_SOURCE_DIR})
+  execute_process(COMMAND echo "Running LFC: ${LFC_COMMAND}")
+  execute_process(
+      COMMAND ${LFC_COMMAND}
+      ECHO_OUTPUT_VARIABLE
+      COMMAND_ERROR_IS_FATAL ANY
+
+  )
+  file(GLOB_RECURSE LF_SOURCES ${LF_SOURCE_DIR}/*.lf)
+  set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${LF_SOURCES})
+  message(STATUS "Found LF sources: ${LF_SOURCES}")
+
+endfunction()
+
+# Build the generated code from the LFC compiler. This function should be called after lf_run_lfc.
+# Args:
+#   TARGET: The CMake target to build the generated code for. This target must already be defined.
+#   SOURCE_GEN_DIR: The directory containing the generated code. This is typically src-gen/${LF_MAIN}. 
+function(lf_build_generated_code TARGET SOURCE_GEN_DIR)
+  # Check if the SOURCE_GEN_DIR exists
+  if (NOT EXISTS ${SOURCE_GEN_DIR})
+    message(FATAL_ERROR "src-gen directory does not exist: ${SOURCE_GEN_DIR}")
+  endif()
+
+  # Check if the CMakeLists.txt file exists in SOURCE_GEN_DIR
+  if (NOT EXISTS ${SOURCE_GEN_DIR}/CMakeLists.txt)
+    message(FATAL_ERROR "CMakeLists.txt does not exist in src-gen directory: ${SOURCE_GEN_DIR}/CMakeLists.txt")
+  endif()
+
+  include(${SOURCE_GEN_DIR}/CMakeLists.txt)
+  add_subdirectory(${REACTOR_UC_PATH})
+  target_sources(${TARGET} PRIVATE ${LFC_GEN_MAIN} ${LFC_GEN_SOURCES})
+  target_include_directories(${TARGET} PRIVATE ${LFC_GEN_INCLUDE_DIRS})
+  target_link_libraries(${TARGET} PUBLIC reactor-uc)
+  target_compile_definitions(reactor-uc PUBLIC LF_LOG_LEVEL_ALL=${LOG_LEVEL})
+  target_compile_definitions(reactor-uc PUBLIC ${LFC_GEN_COMPILE_DEFS})
+endfunction()