comparison src/capnproto-git-20161025/c++/cmake/CapnProtoMacros.cmake @ 48:9530b331f8c1

Add Cap'n Proto source

+# CAPNP_GENERATE_CPP ===========================================================
+#
+# Example usage:
+#   find_package(CapnProto)
+#   capnp_generate_cpp(CAPNP_SRCS CAPNP_HDRS schema.capnp)
+#   include_directories(${CMAKE_CURRENT_BINARY_DIR})
+#   add_executable(foo main.cpp ${CAPNP_SRCS})
+#   target_link_libraries(foo CapnProto::capnp-rpc)
+#
+#  If you are using not using the RPC features you can use
+#  'CapnProto::capnp' in target_link_libraries call
+#
+# Configuration variables (optional):
+#   CAPNPC_OUTPUT_DIR
+#       Directory to place compiled schema sources (default: CMAKE_CURRENT_BINARY_DIR).
+#   CAPNPC_IMPORT_DIRS
+#       List of additional include directories for the schema compiler.
+#       (CMAKE_CURRENT_SOURCE_DIR and CAPNP_INCLUDE_DIRECTORY are always included.)
+#   CAPNPC_SRC_PREFIX
+#       Schema file source prefix (default: CMAKE_CURRENT_SOURCE_DIR).
+#   CAPNPC_FLAGS
+#       Additional flags to pass to the schema compiler.
+#
+# TODO: convert to cmake_parse_arguments
+
+function(CAPNP_GENERATE_CPP SOURCES HEADERS)
+  if(NOT ARGN)
+    message(SEND_ERROR "CAPNP_GENERATE_CPP() called without any source files.")
+  endif()
+  set(tool_depends ${EMPTY_STRING})
+  #Use cmake targets available
+  if(TARGET capnp_tool)
+    set(CAPNP_EXECUTABLE capnp_tool)
+    GET_TARGET_PROPERTY(CAPNPC_CXX_EXECUTABLE capnpc_cpp CAPNPC_CXX_EXECUTABLE)
+    GET_TARGET_PROPERTY(CAPNP_INCLUDE_DIRECTORY capnp_tool CAPNP_INCLUDE_DIRECTORY)
+    list(APPEND tool_depends capnp_tool capnpc_cpp)
+  endif()
+  if(NOT CAPNP_EXECUTABLE)
+    message(SEND_ERROR "Could not locate capnp executable (CAPNP_EXECUTABLE).")
+  endif()
+  if(NOT CAPNPC_CXX_EXECUTABLE)
+    message(SEND_ERROR "Could not locate capnpc-c++ executable (CAPNPC_CXX_EXECUTABLE).")
+  endif()
+  if(NOT CAPNP_INCLUDE_DIRECTORY)
+    message(SEND_ERROR "Could not locate capnp header files (CAPNP_INCLUDE_DIRECTORY).")
+  endif()
+
+  # Default compiler includes
+  set(include_path -I ${CMAKE_CURRENT_SOURCE_DIR} -I ${CAPNP_INCLUDE_DIRECTORY})
+
+  if(DEFINED CAPNPC_IMPORT_DIRS)
+    # Append each directory as a series of '-I' flags in ${include_path}
+    foreach(directory ${CAPNPC_IMPORT_DIRS})
+      get_filename_component(absolute_path "${directory}" ABSOLUTE)
+      list(APPEND include_path -I ${absolute_path})
+    endforeach()
+  endif()
+
+  if(DEFINED CAPNPC_OUTPUT_DIR)
+    # Prepend a ':' to get the format for the '-o' flag right
+    set(output_dir ":${CAPNPC_OUTPUT_DIR}")
+  else()
+    set(output_dir ":.")
+  endif()
+
+  if(NOT DEFINED CAPNPC_SRC_PREFIX)
+    set(CAPNPC_SRC_PREFIX "${CMAKE_CURRENT_SOURCE_DIR}")
+  endif()
+  get_filename_component(CAPNPC_SRC_PREFIX "${CAPNPC_SRC_PREFIX}" ABSOLUTE)
+
+  set(${SOURCES})
+  set(${HEADERS})
+  foreach(schema_file ${ARGN})
+    if(NOT EXISTS "${CAPNPC_SRC_PREFIX}/${schema_file}")
+      message(FATAL_ERROR "Cap'n Proto schema file '${CAPNPC_SRC_PREFIX}/${schema_file}' does not exist!")
+    endif()
+    get_filename_component(file_path "${schema_file}" ABSOLUTE)
+    get_filename_component(file_dir "${file_path}" PATH)
+
+    # Figure out where the output files will go
+    if (NOT DEFINED CAPNPC_OUTPUT_DIR)
+      set(CAPNPC_OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}/")
+    endif()
+    # Output files are placed in CAPNPC_OUTPUT_DIR, at a location as if they were
+    # relative to CAPNPC_SRC_PREFIX.
+    string(LENGTH "${CAPNPC_SRC_PREFIX}" prefix_len)
+    string(SUBSTRING "${file_path}" 0 ${prefix_len} output_prefix)
+    if(NOT "${CAPNPC_SRC_PREFIX}" STREQUAL "${output_prefix}")
+      message(SEND_ERROR "Could not determine output path for '${schema_file}' ('${file_path}') with source prefix '${CAPNPC_SRC_PREFIX}' into '${CAPNPC_OUTPUT_DIR}'.")
+    endif()
+
+    string(SUBSTRING "${file_path}" ${prefix_len} -1 output_path)
+    set(output_base "${CAPNPC_OUTPUT_DIR}${output_path}")
+
+    add_custom_command(
+      OUTPUT "${output_base}.c++" "${output_base}.h"
+      COMMAND "${CAPNP_EXECUTABLE}"
+      ARGS compile
+          -o ${CAPNPC_CXX_EXECUTABLE}${output_dir}
+          --src-prefix ${CAPNPC_SRC_PREFIX}
+          ${include_path}
+          ${CAPNPC_FLAGS}
+          ${file_path}
+      DEPENDS "${schema_file}" ${tool_depends}
+      COMMENT "Compiling Cap'n Proto schema ${schema_file}"
+      VERBATIM
+    )
+
+    list(APPEND ${SOURCES} "${output_base}.c++")
+    list(APPEND ${HEADERS} "${output_base}.h")
+  endforeach()
+
+  set_source_files_properties(${${SOURCES}} ${${HEADERS}} PROPERTIES GENERATED TRUE)
+  set(${SOURCES} ${${SOURCES}} PARENT_SCOPE)
+  set(${HEADERS} ${${HEADERS}} PARENT_SCOPE)
+endfunction()