File plplot-reproducible-jar-mtime.patch of Package plplot

--- plplot-5.15.0/examples/java/CMakeLists.txt	2024-09-26 18:42:42.679062899 +0200
+++ plplot-5.15.0/examples/java/CMakeLists.txt	2024-09-26 19:09:37.234642501 +0200
@@ -60,6 +60,15 @@
   "33"
   )
 
+if (DEFINED ENV{SOURCE_DATE_EPOCH})
+    execute_process(
+      COMMAND "date" "-u" "-d" "@$ENV{SOURCE_DATE_EPOCH}" "+%Y-%m-%dT%H:%M:%SZ"
+      OUTPUT_VARIABLE COMPILATION_DATE
+      OUTPUT_STRIP_TRAILING_WHITESPACE)
+else ()
+    string (TIMESTAMP COMPILATION_DATE "+%Y-%m-%dT%H:%M:%SZ")
+endif ()
+
 if(CORE_BUILD)
   set(java_SRCS)
   foreach(STRING_INDEX ${java_STRING_INDICES})
@@ -133,7 +142,8 @@
   add_custom_command(
     OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/plplot.jar
     COMMAND ${CMAKE_Java_ARCHIVE}
-    -cf ${CMAKE_CURRENT_BINARY_DIR}/plplot.jar -C ${CMAKE_BINARY_DIR}/bindings/java plplot/core -C ${CMAKE_CURRENT_BINARY_DIR} plplot/examples
+    --date=${COMPILATION_DATE} --create --file=${CMAKE_CURRENT_BINARY_DIR}/plplot.jar
+    -C ${CMAKE_BINARY_DIR}/bindings/java plplot/core -C ${CMAKE_CURRENT_BINARY_DIR} plplot/examples
     DEPENDS ${java_CLASSES} ${java_CORE_CLASSES}
     )