----- Mail original ----- > De: "Alan Bateman" <alan.bate...@oracle.com> > À: "org openjdk" <org.open...@io7m.com>, "jigsaw-dev" > <jigsaw-dev@openjdk.java.net> > Envoyé: Samedi 19 Mai 2018 13:26:55 > Objet: Re: Compiling module descriptors is not reproducible?
> On 19/05/2018 10:18, Mark Raynsford wrote: >> Hello! >> >> I've been interested for a while in making all of my software builds >> reproducible [0]. I don't think there's ever been any kind of >> written guarantee that the output of javac will be completely >> deterministic, but to date it seems like it actually has been. However, >> I was a bit disappointed today to find that the output of one of the >> builds at AdoptOpenJDK [1] seems to be inserting compiler version >> information into compiled module descriptors. It doesn't seem to be >> doing this for any other class files. > The requires table in the Module attribute can be used by compilers to > record version information about dependences. javac does record the > version information, I don't know if there is a way to disable that. It seems there is no way: http://hg.openjdk.java.net/jdk/jdk/file/5ec7380f671d/src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/ClassWriter.java#l986 > In any case, I assume your question will be partly answered by looking at > the output of `java --list-modules` on the different builds. If you > download OpenJDK builds from jdk.java.net/10 then you should see that > the standard and JDK-specific modules all report their version string as > "10" or "10.0.1" as they have been built with configure options that > make it so. At a guess, your mail may have included the output from an > exploded (as opposed to images) build. > > -Alan Rémi
