[cmake/java] try to reduce the amount of work done over and over

diff --git a/tools/cmake/Java.cmake b/tools/cmake/Java.cmake
index 6ddf532..6149050 100644 (file)
--- a/tools/cmake/Java.cmake
+++ b/tools/cmake/Java.cmake
@@ -130,17 +130,15 @@ if(enable_lib_in_jar)
     COMMENT "Add the native libs into simgrid.jar..."
     DEPENDS simgrid simgrid-java ${JAVALIBS}
          
     COMMENT "Add the native libs into simgrid.jar..."
     DEPENDS simgrid simgrid-java ${JAVALIBS}
          

-    COMMAND ${CMAKE_COMMAND} -E remove_directory ${JAVA_NATIVE_PATH}

     COMMAND ${CMAKE_COMMAND} -E make_directory   ${JAVA_NATIVE_PATH}
     
     COMMAND ${CMAKE_COMMAND} -E make_directory   ${JAVA_NATIVE_PATH}
     

-    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_BINARY_DIR}/lib/${LIBSIMGRID_SO}      ${JAVA_NATIVE_PATH}
-    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_BINARY_DIR}/lib/${LIBSIMGRID_JAVA_SO} ${JAVA_NATIVE_PATH}
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different ${CMAKE_BINARY_DIR}/lib/${LIBSIMGRID_SO}      ${JAVA_NATIVE_PATH}/${LIBSIMGRID_SO}
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different ${CMAKE_BINARY_DIR}/lib/${LIBSIMGRID_JAVA_SO} ${JAVA_NATIVE_PATH}/${LIBSIMGRID_JAVA_SO}

     # There is no way to disable the dependency of mingw-64 on that lib, unfortunately
     # nor to script cmake -E properly, so let's be brutal
     # There is no way to disable the dependency of mingw-64 on that lib, unfortunately
     # nor to script cmake -E properly, so let's be brutal

-    COMMAND ${CMAKE_COMMAND} -E copy C:/mingw64/bin/libwinpthread-1.dll  ${JAVA_NATIVE_PATH} || true
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different C:/mingw64/bin/libwinpthread-1.dll  ${JAVA_NATIVE_PATH}/libwinpthread-1.dll || true

     
     COMMAND ${JAVA_ARCHIVE} -uvf ${SIMGRID_JAR}  ${JAVA_NATIVE_PATH}
     
     COMMAND ${JAVA_ARCHIVE} -uvf ${SIMGRID_JAR}  ${JAVA_NATIVE_PATH}

-    COMMAND ${CMAKE_COMMAND} -E remove_directory ${JAVA_NATIVE_PATH}

     
     COMMAND ${CMAKE_COMMAND} -E echo "-- Cmake put the native code in ${JAVA_NATIVE_PATH}"
     COMMAND "${Java_JAVA_EXECUTABLE}" -classpath "${SIMGRID_JAR}" org.simgrid.NativeLib
     
     COMMAND ${CMAKE_COMMAND} -E echo "-- Cmake put the native code in ${JAVA_NATIVE_PATH}"
     COMMAND "${Java_JAVA_EXECUTABLE}" -classpath "${SIMGRID_JAR}" org.simgrid.NativeLib