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ReadMe.compiling.md: Add quick lesson on bootstrap in-tree

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Alexander von Gluck IV 2018-02-28 21:47:34 -06:00
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@ -221,6 +221,51 @@ You can also force the rebuild of a component by using the `-a` parameter:
jam -qa Debugger
```
Bootstrap Build
----------------
New architectures (and occasionally existing ones) will require a bootstrap
build to compile *build packages*. (Catch-22 software packages which are needed
to compile Haiku, but need to be initially compiled under Haiku)
### Pre-requirements
* All of the standard tools in the Required Software section above.
* The following repositories on disk in the same general location
* haiku (https://git.haiku-os.org/haiku)
* buildtools (https://git.haiku-os.org/buildtools)
* haikuporter (https://github.com/haikuports/haikuporter.git)
* haikuports.cross (https://github.com/haikuports/haikuports.cross.git)
* haikuports (https://github.com/haikuports/haikuports.git)
### Setting Up a Bootstrap build
Create a clean build directory under the haiku repo.
```
mkdir generated.myarch && cd generated.myarch
```
Configure Haiku's build system for a bootstrap build specifying the location
of all of the repositories above.
```
../configure -j4 \
--build-cross-tools myarch ../../buildtools \
--bootstrap ../../haikuporter/haikuporter ../../haikuports.cross ../../haikuports
```
Once the build system is configured for bootstrap, we now can begin building
the bootstrap image.
```
jam -q @bootstrap-raw
```
If you are bootstrapping for an architecture Haiku already boots on, the generated
disk image can be used to compile *build packages* needed for the standard
Haiku build.
If you are bootstrapping for a new architecture which doesn't build yet, you will
need to leverage the ```unbootstrap.sh``` script to hack the generated bootstrap
packages into non-bootstrap packages which can be temporarily used as
*build packages*.
Running
----------------
Generally there are two ways of running Haiku: on real hardware using a