RFR: JDK-8195689 Remove generated-configure.sh and instead use autoconf

Martin Buchholz martinrb at google.com
Fri Jan 19 06:22:33 UTC 2018

Another possibility is implementing the invariant that configure is
generated via autoconf 2.69 by a mercurial commit hook.

On Thu, Jan 18, 2018 at 10:18 PM, Martin Buchholz <martinrb at google.com>

> Differing projects have come to different conclusions about whether to
> include a generated configure.
> But the standard seems to be to include one. The mantra is: "./configure
> && make" without an autoconf step.  The number of people building openjdk
> is much larger than the number of people patching configure.  So I agree
> with David that we should stick with the status quo.
> On Thu, Jan 18, 2018 at 6:14 PM, David Holmes <david.holmes at oracle.com>
> wrote:
>> On 18/01/2018 11:28 PM, Magnus Ihse Bursie wrote:
>>> Currently, we require all developers who modify the configure script to
>>> run autoconf locally, to update the generated-configure.sh script, which is
>>> then checked in. This is the only instance of checked in "compiled" code in
>>> OpenJDK, and this has brought along several problems:
>>> * Only a specific version of autoconf, 2.69, can be used, to avoid large
>>> code changes in the generated file. Unfortunately, Ubuntu ships a version
>>> of autoconf that claims to be 2.69 but is actually heavily patched. This
>>> requires all Ubuntu users to compiler their own autoconf from source.
>>> * The Oracle JDK closed sources has a closed version that needs to be
>>> updated. In practice, this has meant that all non-Oracle developers, need
>>> an Oracle sponsor for patches modifying the configure script.
>>> * If the configure script is not properly updated, the build will fail.
>>> The same happens on the Oracle side if the closed version is not in sync
>>> with the open version. It is easy to miss re-generating the script after
>>> the last fix of a typo in the comments in an .m4 file...
>>> * Merging between two changes containing configure modifications is
>>> almost impossible. In practice, the entire generated-configure.sh needs to
>>> be thrown away and regenerated.
>>> The entire benefit of having the file in the repo is to save first-time
>>> developers the hassle of installing autoconf. On most platforms, this is a
>>> no-brainer (like "apt install autoconf"), and the requirement is similar to
>>> other open source projects using autoconf and "./configure". It's just not
>>> worth it.
>> I'm not convinced just by you saying it is so - sorry. This seems to make
>> an already complex build process even more complex for every single person
>> who wants to build OpenJDK, for the benefit of a handful of people who may
>> want to modify configure options and whom already work closely with the
>> build team and so there's really little hardship in getting a sponsor, or
>> just someone with access to autoconf.
>> It introduces a new point of failure in the build for everyone.
>> Has this been beta-tested with external contributors? I'd be happier
>> knowing we've put this through its paces with people developing on a wide
>> range of platforms, before making it the default.
>> Have the devkits been updated so I can try this out myself?
>> Thanks,
>> David
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8195689
>>> WebRev: http://cr.openjdk.java.net/~ihse/JDK-8195689-remove-generate
>>> d-configure/webrev.01
>>> /Magnus

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