File octave-reproducible-jar.patch of Package octave

---
 configure.ac           |   10 ++++++++++
 scripts/java/module.mk |   11 +++++++++--
 2 files changed, 19 insertions(+), 2 deletions(-)

Index: octave-10.2.0/scripts/java/module.mk
===================================================================
--- octave-10.2.0.orig/scripts/java/module.mk
+++ octave-10.2.0/scripts/java/module.mk
@@ -52,11 +52,18 @@ $(%canon_reldir%_JAVA_CLASSES) : %.class
 	             -d $(abs_top_builddir)/scripts/java \
 	             $(org_octave_dir)/$(<F) )
 
+JAR_DATE = $(shell date -u -d"@$(SOURCE_MTIME)" -I'seconds')
+
 if AMCOND_HAVE_JAVA
 %reldir%/octave.jar: $(%canon_reldir%_JAVA_CLASSES)
 	$(OCT_V_JAR)rm -f $@-t $@ && \
-	( cd scripts/java; \
-	  "$(JAR)" cf octave.jar-t $(JAVA_CLASSES) ) && \
+	if test "x$(JAR_SUPPORT_DATE)" = "xyes"; then \
+	  ( cd scripts/java; \
+	    "$(JAR)" -c --date="$(JAR_DATE)" -f octave.jar-t $(JAVA_CLASSES) ) \
+	else \
+	  ( cd scripts/java; \
+	    "$(JAR)" -c -f octave.jar-t $(JAVA_CLASSES) ) \
+	fi && \
 	mv $@-t $@
 endif
 
Index: octave-10.2.0/configure.ac
===================================================================
--- octave-10.2.0.orig/configure.ac
+++ octave-10.2.0/configure.ac
@@ -2703,6 +2703,16 @@ do
     break
   fi
 
+  ## Test if jar supports --date for reproducible builds
+  AC_MSG_CHECKING([whether jar supports '--date' option])
+  if $JAR --help | grep -- '--date=' > /dev/null 2>&1; then
+      JAR_SUPPORT_DATE=yes
+      AC_MSG_RESULT($JAR_SUPPORT_DATE)
+      AC_SUBST(JAR_SUPPORT_DATE)
+  else
+      AC_MSG_RESULT(no)
+  fi
+
   ## Passed all configuration tests.  A workable Java installation was found.
   build_java=yes
   AC_DEFINE(HAVE_JAVA, 1,