cmake: Cleanup the build so that host and runtime tooling is installable

Signed-off-by: William A. Kennington III <wak@google.com>

1 files changed, 57 insertions, 26 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index bb236a98..f69386bf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,12 +6,16 @@ set(nanopb_VERSION_STRING nanopb-0.3.8-dev)
 
 string(REPLACE "nanopb-" "" nanopb_VERSION ${nanopb_VERSION_STRING})
 
+option(nanopb_BUILD_RUNTIME "Build the headers and libraries needed at runtime" ON)
+option(nanopb_BUILD_GENERATOR "Build the protoc plugin for code generation" ON)
 option(nanopb_MSVC_STATIC_RUNTIME "Link static runtime libraries" ON)
 
 if(NOT DEFINED CMAKE_DEBUG_POSTFIX)
     set(CMAKE_DEBUG_POSTFIX "d")
 endif()
 
+include(GNUInstallDirs)
+
 if(MSVC AND nanopb_MSVC_STATIC_RUNTIME)
     foreach(flag_var
             CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE
@@ -22,38 +26,65 @@ if(MSVC AND nanopb_MSVC_STATIC_RUNTIME)
     endforeach(flag_var)
 endif()
 
-add_library(protobuf-nanopb STATIC
-    pb.h
-    pb_common.h
-    pb_common.c
-    pb_encode.h
-    pb_encode.c
-    pb_decode.h
-    pb_decode.c)
+if(NOT DEFINED CMAKE_INSTALL_CMAKEDIR)
+    set(CMAKE_INSTALL_CMAKEDIR "lib/cmake/nanopb")
+endif()
 
-target_include_directories(protobuf-nanopb INTERFACE
-  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
-)
+if(nanopb_BUILD_GENERATOR)
+    set(generator_protos nanopb plugin)
 
-include(GNUInstallDirs)
+    find_package(PythonInterp 2.7 REQUIRED)
+    execute_process(
+        COMMAND ${PYTHON_EXECUTABLE} -c
+            "from distutils import sysconfig; print(sysconfig.get_python_lib(prefix='${CMAKE_INSTALL_PREFIX}'))"
+        OUTPUT_VARIABLE PYTHON_INSTDIR
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
 
-if(NOT DEFINED CMAKE_INSTALL_CMAKEDIR)
-    set(CMAKE_INSTALL_CMAKEDIR "lib/cmake/nanopb")
+    foreach(generator_proto IN LISTS generator_protos)
+        string(REGEX REPLACE "([^;]+)" "generator/proto/\\1.proto" generator_proto_file "${generator_proto}")
+        string(REGEX REPLACE "([^;]+)" "\\1_pb2.py" generator_proto_py_file "${generator_proto}")
+        add_custom_command(
+            OUTPUT ${generator_proto_py_file}
+            COMMAND protoc --python_out=${CMAKE_CURRENT_BINARY_DIR} -Igenerator/proto ${generator_proto_file}
+            DEPENDS ${generator_proto_file}
+        )
+        add_custom_target("generate_${generator_proto_py_file}" ALL DEPENDS ${generator_proto_py_file})
+        install(
+            FILES ${generator_proto_py_file}
+			DESTINATION ${PYTHON_INSTDIR}
+        )
+    endforeach()
 endif()
 
-install(TARGETS protobuf-nanopb EXPORT nanopb-targets
-    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+if(nanopb_BUILD_RUNTIME)
+    add_library(protobuf-nanopb STATIC
+        pb.h
+        pb_common.h
+        pb_common.c
+        pb_encode.h
+        pb_encode.c
+        pb_decode.h
+        pb_decode.c)
+
+    target_include_directories(protobuf-nanopb INTERFACE
+      $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+    )
 
-install(EXPORT nanopb-targets
-    DESTINATION ${CMAKE_INSTALL_CMAKEDIR}
-    NAMESPACE nanopb::)
+    configure_file(extra/nanopb-config-version.cmake.in
+        nanopb-config-version.cmake @ONLY)
 
-configure_file(extra/nanopb-config-version.cmake.in
-    nanopb-config-version.cmake @ONLY)
+    install(TARGETS protobuf-nanopb EXPORT nanopb-targets
+        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
 
-install(FILES extra/nanopb-config.cmake
-    ${CMAKE_CURRENT_BINARY_DIR}/nanopb-config-version.cmake
-    DESTINATION ${CMAKE_INSTALL_CMAKEDIR})
+    install(EXPORT nanopb-targets
+        DESTINATION ${CMAKE_INSTALL_CMAKEDIR}
+        NAMESPACE nanopb::)
 
-install(FILES pb.h pb_common.h pb_encode.h pb_decode.h
-    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+    install(FILES extra/nanopb-config.cmake
+        ${CMAKE_CURRENT_BINARY_DIR}/nanopb-config-version.cmake
+        DESTINATION ${CMAKE_INSTALL_CMAKEDIR})
+
+    install(FILES pb.h pb_common.h pb_encode.h pb_decode.h
+        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+endif()