Add maven-plugin bash build script

tools/gcc-bridge/maven-plugin/README.md

@@ -12,13 +12,14 @@ of how to use the plugin to incorporate C sources in a Maven Project.
 At this stage, the maven plugin cannot be built using gradle, and so must be built separatetly.  You can do so with the following steps
 
 1. Export the renjin toolchain to your local maven repository by invoking `./gradlew publishToMavenLocal` in the root folder of the Renjin project
-2. Ensure the `<version>` in the `pom.xml` in this directory matches the version generated by `allprojects.project.version` in the `build.gradle` of the root folder
-3. Invoke `mvn package` in this directory
-4. Manually install the runtime jar into your local maven repository:
+1. Ensure the `<version>` in the `pom.xml` in this directory matches the version generated by `allprojects.project.version` in the `build.gradle` of the root folder
+1. Invoke `mvn package` in this directory
+1. Manually install the runtime jar into your local maven repository:
    ```mvn install:install-file -Dfile=<path to renjin>/tools/gcc-bridge/runtime/build/libs/runtime-<version>.jar -DgroupId=org.renjin -DartifactId=gcc-runtime -Dversion=<version> -Dpackaging=jar```  
     _(adapt the `<path>` and `<version>`s to suit)_  
-4. Manually install the jar into your local maven repository:  
+1. Manually install the jar into your local maven repository:  
    ```mvn install:install-file -Dfile=<path to maven plugn>/target/gcc-bridge-maven-plugin-<version>.jar -DgroupId=org.renjin -DartifactId=gcc-bridge-maven-plugin -Dversion=<version> -Dpackaging=jar -DpomFile=pom.xml```  
    _(adapt the `<path>` and `<version>`s to suit)_
 
-The `gcc-bridge-example` should now use your local toolchain to build.
+Some of the last steps are encapsulated in the `./dev-build.sh` bash script.  If all steps complete successfully, the `gcc-bridge-example` should now use your local toolchain to build.
+

tools/gcc-bridge/maven-plugin/dev-build.sh

@@ -0,0 +1,17 @@
+#!/bin/bash -e
+
+if [ -z "$1" ]; then
+	echo "USAGE: ./dev-build.sh <version>"
+	echo
+	echo "where <version> relates to the version in './pom.xml' and the project.version property in '../../../build.gradle'"
+	echo "e.g., ./dev-build.sh 3.5-betadev"
+	exit 1
+fi
+
+[ -f "../runtime/build/libs/runtime-$1.jar" ] || { echo "Runtime library not built, run './gradlew publishToMavenLocal' in the renjin root folder, and ensure version is consistent" && exit 1; }
+
+echo "Building..."
+set -x
+mvn package
+mvn install:install-file -Dfile=../runtime/build/libs/runtime-$1.jar -DgroupId=org.renjin -DartifactId=gcc-runtime -Dversion=$1 -Dpackaging=jar
+mvn install:install-file -Dfile=target/gcc-bridge-maven-plugin-$1.jar -DgroupId=org.renjin -DartifactId=gcc-bridge-maven-plugin -Dversion=$1 -Dpackaging=jar -DpomFile=pom.xml