8244592: Start supporting SOURCE_DATE_EPOCH

Reviewed-by: mbaesken
Backport-of: 1a16a4b

Author: RealCLanger

make/Init.gmk

@@ -226,6 +226,9 @@ else # HAS_SPEC=true
   # Parse COMPARE_BUILD (for makefile development)
   $(eval $(call ParseCompareBuild))
 
+  # Setup reproducible build environment
+  $(eval $(call SetupReproducibleBuild))
+
   # If no LOG= was given on command line, but we have a non-standard default
   # value, use that instead and re-parse log level.
   ifeq ($(LOG), )

make/InitSupport.gmk

@@ -303,6 +303,15 @@ else # $(HAS_SPEC)=true
     topdir=$(TOPDIR)
   endif
 
+  # Setup the build environment to match the requested specification on
+  # level of reproducible builds
+  define SetupReproducibleBuild
+    ifeq ($$(SOURCE_DATE), updated)
+      SOURCE_DATE := $$(shell $$(DATE) +"%s")
+    endif
+    export SOURCE_DATE_EPOCH := $$(SOURCE_DATE)
+  endef
+
   # Parse COMPARE_BUILD into COMPARE_BUILD_*
   # Syntax: COMPARE_BUILD=CONF=<configure options>:PATCH=<patch file>:
   #         MAKE=<make targets>:COMP_OPTS=<compare script options>:

make/autoconf/configure.ac

@@ -235,6 +235,7 @@ JDKOPT_ENABLE_DISABLE_FAILURE_HANDLER
 JDKOPT_ENABLE_DISABLE_GENERATE_CLASSLIST
 JDKOPT_EXCLUDE_TRANSLATIONS
 JDKOPT_ENABLE_DISABLE_MANPAGES
+JDKOPT_SETUP_REPRODUCIBLE_BUILD
 
 ###############################################################################
 #

make/autoconf/jdk-options.m4

@@ -683,3 +683,76 @@ AC_DEFUN([JDKOPT_ALLOW_ABSOLUTE_PATHS_IN_OUTPUT],
 
   AC_SUBST(ALLOW_ABSOLUTE_PATHS_IN_OUTPUT)
 ])
+
+################################################################################
+#
+# Check and set options related to reproducible builds.
+#
+AC_DEFUN_ONCE([JDKOPT_SETUP_REPRODUCIBLE_BUILD],
+[
+  AC_ARG_WITH([source-date], [AS_HELP_STRING([--with-source-date],
+      [how to set SOURCE_DATE_EPOCH ('updated', 'current', 'version' a timestamp or an ISO-8601 date) @<:@updated@:>@])],
+      [with_source_date_present=true], [with_source_date_present=false])
+
+  AC_MSG_CHECKING([what source date to use])
+
+  if test "x$with_source_date" = xyes; then
+    AC_MSG_ERROR([--with-source-date must have a value])
+  elif test "x$with_source_date" = xupdated || test "x$with_source_date" = x; then
+    # Tell the makefiles to update at each build
+    SOURCE_DATE=updated
+    AC_MSG_RESULT([determined at build time, from 'updated'])
+  elif test "x$with_source_date" = xcurrent; then
+    # Set the current time
+    SOURCE_DATE=$($DATE +"%s")
+    AC_MSG_RESULT([$SOURCE_DATE, from 'current'])
+  elif test "x$with_source_date" = xversion; then
+    # Use the date from version-numbers
+    UTIL_GET_EPOCH_TIMESTAMP(SOURCE_DATE, $DEFAULT_VERSION_DATE)
+    if test "x$SOURCE_DATE" = x; then
+      AC_MSG_RESULT([unavailable])
+      AC_MSG_ERROR([Cannot convert DEFAULT_VERSION_DATE to timestamp])
+    fi
+    AC_MSG_RESULT([$SOURCE_DATE, from 'version'])
+  else
+    # It's a timestamp, an ISO-8601 date, or an invalid string
+    # Additional [] needed to keep m4 from mangling shell constructs.
+    if [ [[ "$with_source_date" =~ ^[0-9][0-9]*$ ]] ] ; then
+      SOURCE_DATE=$with_source_date
+      AC_MSG_RESULT([$SOURCE_DATE, from timestamp on command line])
+    else
+      UTIL_GET_EPOCH_TIMESTAMP(SOURCE_DATE, $with_source_date)
+      if test "x$SOURCE_DATE" != x; then
+        AC_MSG_RESULT([$SOURCE_DATE, from ISO-8601 date on command line])
+      else
+        AC_MSG_RESULT([unavailable])
+        AC_MSG_ERROR([Cannot parse date string "$with_source_date"])
+      fi
+    fi
+  fi
+
+  REPRODUCIBLE_BUILD_DEFAULT=$with_source_date_present
+
+  if test "x$OPENJDK_BUILD_OS" = xwindows && \
+      test "x$ALLOW_ABSOLUTE_PATHS_IN_OUTPUT" = xfalse; then
+    # To support banning absolute paths on Windows, we must use the -pathmap
+    # method, which requires reproducible builds.
+    REPRODUCIBLE_BUILD_DEFAULT=true
+  fi
+
+  UTIL_ARG_ENABLE(NAME: reproducible-build, DEFAULT: $REPRODUCIBLE_BUILD_DEFAULT,
+      RESULT: ENABLE_REPRODUCIBLE_BUILD,
+      DESC: [enable reproducible builds (not yet fully functional)],
+      DEFAULT_DESC: [enabled if --with-source-date is given or on Windows without absolute paths])
+
+  if test "x$OPENJDK_BUILD_OS" = xwindows && \
+      test "x$ALLOW_ABSOLUTE_PATHS_IN_OUTPUT" = xfalse && \
+      test "x$ENABLE_REPRODUCIBLE_BUILD" = xfalse; then
+    AC_MSG_NOTICE([On Windows it is not possible to combine  --disable-reproducible-builds])
+    AC_MSG_NOTICE([with --disable-absolute-paths-in-output.])
+    AC_MSG_ERROR([Cannot continue])
+  fi
+
+  AC_SUBST(SOURCE_DATE)
+  AC_SUBST(ENABLE_REPRODUCIBLE_BUILD)
+])

make/autoconf/jdk-version.m4

@@ -36,7 +36,7 @@
 AC_DEFUN([JDKVER_CHECK_AND_SET_NUMBER],
 [
   # Additional [] needed to keep m4 from mangling shell constructs.
-  if [ ! [[ "$2" =~ ^0*([1-9][0-9]*)|(0)$ ]] ] ; then
+  if [ ! [[ "$2" =~ ^0*([1-9][0-9]*)$|^0*(0)$ ]] ] ; then
     AC_MSG_ERROR(["$2" is not a valid numerical value for $1])
   fi
   # Extract the version number without leading zeros.

make/autoconf/spec.gmk.in

@@ -126,6 +126,9 @@ RELEASE_FILE_OS_NAME:=@RELEASE_FILE_OS_NAME@
 RELEASE_FILE_OS_ARCH:=@RELEASE_FILE_OS_ARCH@
 RELEASE_FILE_LIBC:=@RELEASE_FILE_LIBC@
 
+SOURCE_DATE := @SOURCE_DATE@
+ENABLE_REPRODUCIBLE_BUILD := @ENABLE_REPRODUCIBLE_BUILD@
+
 LIBM:=@LIBM@
 LIBDL:=@LIBDL@