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8251549: Update docs on building for Git
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## TL;DR (Instructions for the Impatient)

If you are eager to try out building the JDK, these simple steps works most of
the time. They assume that you have installed Mercurial (and Cygwin if running
the time. They assume that you have installed Git (and Cygwin if running
on Windows) and cloned the top-level JDK repository that you want to build.

1. [Get the complete source code](#getting-the-source-code): \
`hg clone http://hg.openjdk.java.net/jdk/jdk`
`git clone https://git.openjdk.java.net/jdk/`

2. [Run configure](#running-configure): \
`bash configure`
Expand Down Expand Up @@ -47,14 +47,14 @@ JDK.

Make sure you are getting the correct version. As of JDK 10, the source is no
longer split into separate repositories so you only need to clone one single
repository. At the [OpenJDK Mercurial server](http://hg.openjdk.java.net/) you
repository. At the [OpenJDK Git site](https://git.openjdk.java.net/) you
can see a list of all available repositories. If you want to build an older version,
e.g. JDK 8, it is recommended that you get the `jdk8u` forest, which contains
incremental updates, instead of the `jdk8` forest, which was frozen at JDK 8 GA.
e.g. JDK 11, it is recommended that you get the `jdk11u` repo, which contains
incremental updates, instead of the `jdk11` repo, which was frozen at JDK 11 GA.

If you are new to Mercurial, a good place to start is the [Mercurial Beginner's
Guide](http://www.mercurial-scm.org/guide). The rest of this document assumes a
working knowledge of Mercurial.
If you are new to Git, a good place to start is the book [Pro
Git](https://git-scm.com/book/en/v2). The rest of this document
assumes a working knowledge of Git.

### Special Considerations

Expand Down Expand Up @@ -89,9 +89,21 @@ on where and how to check out the source code.
directory. This is especially important if your user name contains
spaces and/or mixed upper and lower case letters.

* Clone the JDK repository using the Cygwin command line `hg` client
as instructed in this document. That is, do *not* use another Mercurial
client such as TortoiseHg.
* You need to install a git client. You have two choices, Cygwin git or
Git for Windows. Unfortunately there are pros and cons with each choice.

* The Cygwin `git` client has no line ending issues and understands
Cygwin paths (which are used throughout the JDK build system).
However, it does not currently work well with the Skara CLI tooling.
Please see the [Skara wiki on Git clients](
https://wiki.openjdk.java.net/display/SKARA/Skara#Skara-Git) for
up-to-date information about the Skara git client support.

* The [Git for Windows](https://gitforwindows.org) client has issues
with line endings, and do not understand Cygwin paths. It does work
well with the Skara CLI tooling, however. To alleviate the line ending
problems, make sure you set `core.autocrlf` to `false` (this is asked
during installation).

Failure to follow this procedure might result in hard-to-debug build
problems.
Expand Down Expand Up @@ -173,7 +185,7 @@ likely be possible to support in a future version but that would require effort
to implement.)

Internally in the build system, all paths are represented as Unix-style paths,
e.g. `/cygdrive/c/hg/jdk9/Makefile` rather than `C:\hg\jdk9\Makefile`. This
e.g. `/cygdrive/c/git/jdk/Makefile` rather than `C:\git\jdk\Makefile`. This
rule also applies to input to the build system, e.g. in arguments to
`configure`. So, use `--with-msvcr-dll=/cygdrive/c/msvcr100.dll` rather than
`--with-msvcr-dll=c:\msvcr100.dll`. For details on this conversion, see the section
Expand Down Expand Up @@ -1244,14 +1256,14 @@ ERROR: Build failed for target 'hotspot' in configuration 'linux-x64' (exit code
=== Output from failing command(s) repeated here ===
* For target hotspot_variant-server_libjvm_objs_psMemoryPool.o:
/localhome/hg/jdk9-sandbox/hotspot/src/share/vm/services/psMemoryPool.cpp:1:1: error: 'failhere' does not name a type
/localhome/git/jdk-sandbox/hotspot/src/share/vm/services/psMemoryPool.cpp:1:1: error: 'failhere' does not name a type
... (rest of output omitted)
* All command lines available in /localhome/hg/jdk9-sandbox/build/linux-x64/make-support/failure-logs.
* All command lines available in /localhome/git/jdk-sandbox/build/linux-x64/make-support/failure-logs.
=== End of repeated output ===
=== Make failed targets repeated here ===
lib/CompileJvm.gmk:207: recipe for target '/localhome/hg/jdk9-sandbox/build/linux-x64/hotspot/variant-server/libjvm/objs/psMemoryPool.o' failed
lib/CompileJvm.gmk:207: recipe for target '/localhome/git/jdk-sandbox/build/linux-x64/hotspot/variant-server/libjvm/objs/psMemoryPool.o' failed
make/Main.gmk:263: recipe for target 'hotspot-server-libs' failed
=== End of repeated output ===
Expand Down Expand Up @@ -1349,7 +1361,7 @@ order. Most issues will be solved at step 1 or 2.

1. Make sure your repository is up-to-date

Run `hg pull -u` to make sure you have the latest changes.
Run `git pull origin master` to make sure you have the latest changes.

2. Clean build results

Expand All @@ -1374,13 +1386,13 @@ order. Most issues will be solved at step 1 or 2.
make
```

4. Re-clone the Mercurial repository
4. Re-clone the Git repository

Sometimes the Mercurial repository gets in a state that causes the product
Sometimes the Git repository gets in a state that causes the product
to be un-buildable. In such a case, the simplest solution is often the
"sledgehammer approach": delete the entire repository, and re-clone it.
If you have local changes, save them first to a different location using
`hg export`.
`git format-patch`.

### Specific Build Issues

Expand Down Expand Up @@ -1425,33 +1437,6 @@ contact the Adoption Group. See the section on [Contributing to OpenJDK](

## Hints and Suggestions for Advanced Users

### Setting Up a Repository for Pushing Changes (defpath)

To help you prepare a proper push path for a Mercurial repository, there exists
a useful tool known as [defpath](
http://openjdk.java.net/projects/code-tools/defpath). It will help you setup a
proper push path for pushing changes to the JDK.

Install the extension by cloning
`http://hg.openjdk.java.net/code-tools/defpath` and updating your `.hgrc` file.
Here's one way to do this:

```
cd ~
mkdir hg-ext
cd hg-ext
hg clone http://hg.openjdk.java.net/code-tools/defpath
cat << EOT >> ~/.hgrc
[extensions]
defpath=~/hg-ext/defpath/defpath.py
EOT
```

You can now setup a proper push path using:
```
hg defpath -d -u <your OpenJDK username>
```

### Bash Completion

The `configure` and `make` commands tries to play nice with bash command-line
Expand Down Expand Up @@ -1592,16 +1577,6 @@ instance, `make java.base JDK_FILTER=javax/crypto` (or, to combine methods,
`make java.base-java-only JDK_FILTER=javax/crypto`) will limit the compilation
to files in the `javax.crypto` package.

### Learn About Mercurial

To become an efficient JDK developer, it is recommended that you invest in
learning Mercurial properly. Here are some links that can get you started:

* [Mercurial for git users](http://www.mercurial-scm.org/wiki/GitConcepts)
* [The official Mercurial tutorial](http://www.mercurial-scm.org/wiki/Tutorial)
* [hg init](http://hginit.com/)
* [Mercurial: The Definitive Guide](http://hgbook.red-bean.com/read/)

## Understanding the Build System

This section will give you a more technical description on the details of the
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