Improves documentation

 * Describes better available source tree sharing method (between
xds-agent and xds-server), and which to prefer depending on the
deployment setup.
 * Gives indication about how to pass RSYNC_TARGET and RSYNC_PREFIX
 env vars to the helloworld-native-application build process.
 * Swap chapter order (build before config)

Bug: SPEC-1993

Change-Id: Ie4c22f277a59b0405744d71b0fadff67c5d5d025
Signed-off-by: Sebastien Douheret <sebastien.douheret@iot.bzh>

1 files changed, 39 insertions, 0 deletions

diff --git a/docs/part-2/4_xds-gdb/1_build.md b/docs/part-2/4_xds-gdb/1_build.md
new file mode 100644
index 0000000..9ec91b3
--- /dev/null
+++ b/docs/part-2/4_xds-gdb/1_build.md
@@ -0,0 +1,39 @@
+# How to build xds-gdb from scratch
+
+## Dependencies
+
+Install [Go](https://golang.org/doc/install) and some other tools.
+
+Refer to [Prerequisites chapter](../1_Prerequisites.html) for more details.
+
+## Building
+
+Clone sources under `$ROOTDIR/src/gerrit.automotivelinux.org/gerrit/src/xds/xds-gdb`
+in order respect directory hierarchy that match Go package import logic (see
+[How to Write Go Code](https://golang.org/doc/code.html) for more details).
+
+Then use delivered Makefile :
+
+```bash
+# Declare ROOTDIR, can be any location (for example xds-build)
+ROOTDIR=$HOME/xds-build
+
+# Create directory hierarchy that match Go package import logic
+mkdir -p $ROOTDIR/src/gerrit.automotivelinux.org/gerrit/src/xds
+cd $ROOTDIR/src/gerrit.automotivelinux.org/gerrit/src/xds
+
+# Clone sources
+git clone https://gerrit.automotivelinux.org/gerrit/src/xds/xds-gdb
+# or git clone ssh://YOUR_USERNAME@gerrit.automotivelinux.org:29418/src/xds/xds-gdb
+
+# Build xds-gdb
+# (note that GOPATH will correctly be set by Makefile)
+cd xds-gdb
+make all
+```
+
+Generate xds-gdb package / tarball
+
+```bash
+make package-all
+```