CMake: Update Java support

* Add define SWIGWORDSIZE64 on Linux
* Add -doxygen option

cmake/java.cmake

@@ -9,6 +9,14 @@ endif()
 find_package(SWIG REQUIRED)
 include(UseSWIG)
 
+if(${SWIG_VERSION} VERSION_GREATER_EQUAL 4)
+  list(APPEND CMAKE_SWIG_FLAGS "-doxygen")
+endif()
+
+if(UNIX AND NOT APPLE)
+  list(APPEND CMAKE_SWIG_FLAGS "-DSWIGWORDSIZE64")
+endif()
+
 # Generate Protobuf java sources
 set(PROTO_JAVAS)
 file(GLOB_RECURSE proto_java_files RELATIVE ${PROJECT_SOURCE_DIR}
@@ -28,7 +36,7 @@ foreach(PROTO_FILE ${proto_java_files})
     OUTPUT ${PROTO_JAVA}
     COMMAND protobuf::protoc
     "--proto_path=${PROJECT_SOURCE_DIR}"
-    "--java_out=${PROJECT_BINARY_DIR}/java"
+    "--java_out=${PROJECT_BINARY_DIR}/java/com/google/"
     ${PROTO_FILE}
     DEPENDS ${PROTO_FILE} protobuf::protoc
     COMMENT "Running C++ protocol buffer compiler on ${PROTO_FILE}"
@@ -46,9 +54,9 @@ find_package(JNI REQUIRED)
 set(FLAGS -DUSE_BOP -DUSE_GLOP -DABSL_MUST_USE_RESULT)
 if(USE_COINOR)
   list(APPEND FLAGS
-     "-DUSE_CBC"
-     "-DUSE_CLP"
-  )
+    "-DUSE_CBC"
+    "-DUSE_CLP"
+    )
 endif()
 list(APPEND CMAKE_SWIG_FLAGS ${FLAGS} "-I${PROJECT_SOURCE_DIR}")
 
@@ -56,11 +64,22 @@ foreach(SUBPROJECT constraint_solver linear_solver sat graph algorithms data)
   #add_subdirectory(ortools/${SUBPROJECT}/java)
 endforeach()
 
+file(GENERATE
+  OUTPUT java/pom.xml
+  INPUT ortools/java/pom.xml.in)
+
+
 # Main Target
 add_custom_target(java_package ALL
-  DEPENDS pom.xml
-  COMMAND ${CMAKE_COMMAND} -E remove_directory dist
+  DEPENDS
+    ortools::ortools
+    Java${PROJECT_NAME}_proto
+    java/pom.xml
+  COMMAND ${CMAKE_COMMAND} -E remove_directory com
   COMMAND ${Java_JAVAC_EXECUTABLE} pom.xml
+  BYPRODUCTS
+    java
+  WORKING_DIRECTORY java
   )
 
 # Test

ortools/java/pom.xml.in

@@ -0,0 +1,22 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
+  http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<modelVersion>4.0.0</modelVersion>
+<groupId>com.google.ortools</groupId>
+<artifactId>ortools-java</artifactId>
+<version>${PROJECT_VERSION}</version>
+<dependencies>
+  <dependency>
+    <groupId>com.google.protobuf</groupId>
+    <artifactId>protobuf-java</artifactId>
+    <version>3.11.2</version>
+  </dependency>
+</dependencies>
+<build>
+  <directory>${project.basedir}</directory>
+  <outputDirectory>${project.build.directory}/lib</outputDirectory>
+  <sourceDirectory>${project.basedir}/ortools</sourceDirectory>
+</build>
+</project>
+