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8290466: Default to --with-source-date=current to avoid unmodified Hotspot recompilation

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Reviewed-by: erikj, ihse
This commit is contained in:
Aleksey Shipilev 2022-07-31 18:52:16 +00:00
parent acbe093a66
commit d9cb410efc
3 changed files with 9 additions and 9 deletions
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4
doc/building.html
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@ -898,13 +898,13 @@ spawn failed</code></pre>
<pre><code>export SOURCE_DATE_EPOCH=946684800
bash configure --with-version-opt=adhoc
make</code></pre>
<p>Note that regardless if you specify a source date for <code>configure</code> or not, the JDK build system will set <code>SOURCE_DATE_EPOCH</code> for all build tools when building. If <code>--with-source-date</code> has the value <code>updated</code> (which is the default unless <code>SOURCE_DATE_EPOCH</code> is found by in the environment by <code>configure</code>), the source date value will be determined at build time.</p>
<p>Note that regardless if you specify a source date for <code>configure</code> or not, the JDK build system will set <code>SOURCE_DATE_EPOCH</code> for all build tools when building. If <code>--with-source-date</code> has the value <code>current</code> (which is the default unless <code>SOURCE_DATE_EPOCH</code> is found by in the environment by <code>configure</code>), the source date value will be determined at configure time.</p>
<p>There are several aspects of reproducible builds that can be individually adjusted by <code>configure</code> arguments. If any of these are given, they will override the value derived from <code>SOURCE_DATE_EPOCH</code>. These arguments are:</p>
<ul>
<li><p><code>--with-source-date</code></p>
<p>This option controls how the JDK build sets <code>SOURCE_DATE_EPOCH</code> when building. It can be set to a value describing a date, either an epoch based timestamp as an integer, or a valid ISO-8601 date.</p>
<p>It can also be set to one of the special values <code>current</code>, <code>updated</code> or <code>version</code>. <code>current</code> means that the time of running <code>configure</code> will be used. <code>version</code> will use the nominal release date for the current JDK version. <code>updated</code>, which means that <code>SOURCE_DATE_EPOCH</code> will be set to the current time each time you are running <code>make</code>. All choices, except for <code>updated</code>, will set a fixed value for the source date timestamp.</p>
<p>When <code>SOURCE_DATE_EPOCH</code> is set, the default value for <code>--with-source-date</code> will be the value given by <code>SOURCE_DATE_EPOCH</code>. Otherwise, the default value is <code>updated</code>.</p></li>
<p>When <code>SOURCE_DATE_EPOCH</code> is set, the default value for <code>--with-source-date</code> will be the value given by <code>SOURCE_DATE_EPOCH</code>. Otherwise, the default value is <code>current</code>.</p></li>
<li><p><code>--with-hotspot-build-time</code></p>
<p>This option controls the build time string that will be included in the hotspot library (<code>libjvm.so</code> or <code>jvm.dll</code>). When the source date is fixed (e.g. by setting <code>SOURCE_DATE_EPOCH</code>), the default value for <code>--with-hotspot-build-time</code> will be an ISO 8601 representation of that time stamp. Otherwise the default value will be the current time when building hotspot.</p></li>
<li><p><code>--with-copyright-year</code></p>

6
doc/building.md
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@ -1559,9 +1559,9 @@ make
Note that regardless if you specify a source date for `configure` or not, the
JDK build system will set `SOURCE_DATE_EPOCH` for all build tools when building.
If `--with-source-date` has the value `updated` (which is the default unless
If `--with-source-date` has the value `current` (which is the default unless
`SOURCE_DATE_EPOCH` is found by in the environment by `configure`), the source
date value will be determined at build time.
date value will be determined at configure time.
There are several aspects of reproducible builds that can be individually
adjusted by `configure` arguments. If any of these are given, they will override
@ -1582,7 +1582,7 @@ the value derived from `SOURCE_DATE_EPOCH`. These arguments are:
When `SOURCE_DATE_EPOCH` is set, the default value for `--with-source-date`
will be the value given by `SOURCE_DATE_EPOCH`. Otherwise, the default value
is `updated`.
is `current`.
* `--with-hotspot-build-time`

8
make/autoconf/jdk-options.m4
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@ -648,7 +648,7 @@ AC_DEFUN([JDKOPT_ALLOW_ABSOLUTE_PATHS_IN_OUTPUT],
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/value of SOURCE_DATE_EPOCH@:>@])],
[how to set SOURCE_DATE_EPOCH ('updated', 'current', 'version' a timestamp or an ISO-8601 date) @<:@current/value of SOURCE_DATE_EPOCH@:>@])],
[with_source_date_present=true], [with_source_date_present=false])
if test "x$SOURCE_DATE_EPOCH" != x && test "x$with_source_date" != x; then
@ -665,9 +665,9 @@ AC_DEFUN_ONCE([JDKOPT_SETUP_REPRODUCIBLE_BUILD],
with_source_date_present=true
AC_MSG_RESULT([$SOURCE_DATE, from SOURCE_DATE_EPOCH])
else
# Tell the makefiles to update at each build
SOURCE_DATE=updated
AC_MSG_RESULT([determined at build time (default)])
# Tell makefiles to take the time from configure
SOURCE_DATE=$($DATE +"%s")
AC_MSG_RESULT([$SOURCE_DATE, from 'current' (default)])
fi
elif test "x$with_source_date" = xupdated; then
SOURCE_DATE=updated