RFR: JDK-8241463 Move build tools to respective modules

[naoto.sato at oracle.com]

Hi Magnus,

I looked at i18n related changes:

make/CopyInterimTZDB.gmk
make/ToolsJdk.gmk
make/gendata/Gendata-java.base.gmk
make/gendata/GendataBreakIterator.gmk
make/gendata/GendataTZDB.gmk
make/gensrc/GensrcCharacterData.gmk
make/gensrc/GensrcEmojiData.gmk

They look ok to me.

The *.java changes should have copyright year update.

As to charsetmapping and cldrconverter, I believe they can reside in 
java.base, as jdk.charsets and jdk.localedata modules depend on it.

Naoto

On 3/23/20 12:03 PM, Magnus Ihse Bursie wrote:
> The build tools (small java tools that are run during the build to 
> generate source code, or data, needed in the JDK) have historically been 
> placed in the "make" directory. This maybe made sense long time ago, but 
> does not do so anymore.
> 
> Instead, the build tools source code should move the the module that 
> needs them. For instance, compilefontconfig should move to java.desktop, 
> etc.
> 
> There are multiple reasons for this:
> 
> * Currently we build *all* build tools at once, which mean that we 
> cannot compile java.base until e.g. the compilefontconfig tool is 
> compiled, even though it is not needed.
> 
> * If a build tool, e.g. compilefontconfig is modified, all build tools 
> are recompiled, which triggers a rebuild of more or less the entire JDK. 
> This makes development of the build tools unnecessary tedious.
> 
> * When the build tools are modified, the group owning the corresponding 
> module is the proper review instance, not the build team. But since they 
> reside under "make", the review mails often include build-dev, but this 
> is mostly noise for us. With this move, the ownership is made clear.
> 
> In this patch, I have not modified how and when the build tools are 
> compiled, but this shuffle is the prerequisite for continuing with that 
> in a follow-up patch.
> 
> I have also moved the build tools to the org.openjdk.buildtools.* 
> package name space (inspired by Skara), instead of the strangely named 
> build.tools.* name space.
> 
> A few build tools are not moved in this patch. Two of them, 
> charsetmapping and cldrconverter, are shared between two modules. (I 
> think they should move to modules nevertheless, but they need some more 
> thought to make sure I do this right.) The rest are tools that are 
> needed for the build in general, like linking or javadoc support. I'll 
> move this to a better location too, but in a separate patch.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8241463
> WebRev: 
> http://cr.openjdk.java.net/~ihse/JDK-8241463-move-build-tools-to-modules/webrev.01 
> 
> 
> /Magnus
>