Make installing toolchains and native libraries optional

If you pass -Dinstall_toolchains=false or -Dinstall_native_libs=false to
the ant command, the toolchains or native libraries will not be
installed into the build/work directory, making the IDE fall back on the
system versions instead.

This is intended for advanced users who run from git and want to use
their system toolchain or libraries. These toolchain-less installs are
not intended to be distributed as tarballs.

Author: matthijskooijman

build/build.xml

@@ -26,6 +26,10 @@
   <condition property="staging_hardware_folder" value="hardware"><equals arg1="${platform}" arg2="windows" /></condition>
   <condition property="staging_hardware_folder" value="hardware"><equals arg1="${platform}" arg2="linux32" /></condition>
   <condition property="staging_hardware_folder" value="hardware"><equals arg1="${platform}" arg2="linux64" /></condition>
+  <!-- Define these to false skip installing the toolchains and native
+       libraries. E.g., run ant -Dinstall_toolchains=false  -->
+  <property name="install_toolchains" value="true" />
+  <property name="install_native_libs" value="true" />
 
   <condition property="arch-bits" value="32">
     <equals arg1="${platform}" arg2="linux32"/>
@@ -227,7 +231,7 @@
     </antcall>
   </target>
 
-  <target name="macosx-toolchains">
+  <target name="macosx-toolchains" if="${install_toolchains}">
     <exec executable="unzip">
       <arg value="-q" />
       <arg value="-n" />
@@ -260,7 +264,7 @@
     </delete>
   </target>
 
-  <target name="macosx-native-libs">
+  <target name="macosx-native-libs" if="${install_native_libs}">
     <get src="http://downloads.arduino.cc/libastylej-2.03.zip" dest="macosx" usetimestamp="true" />
     <unzip src="macosx/libastylej-2.03.zip" dest="macosx" overwrite="true"/>
     <copy file="macosx/libastylej/libastylej.jnilib" todir="macosx/work/Arduino.app/Contents/Resources/Java/lib/" />
@@ -463,7 +467,7 @@
     <chmod perm="755" file="linux/work/arduino" />
   </target>
 
-  <target name="linux-native-libs">
+  <target name="linux-native-libs" if="${install_native_libs}">
     <get src="http://downloads.arduino.cc/libastylej-2.03.zip" dest="linux" usetimestamp="true" />
     <unzip src="linux/libastylej-2.03.zip" dest="linux" overwrite="true"/>
     <copy file="linux/libastylej/libastylej${arch-bits}.so" tofile="linux/work/lib/libastylej.so" />
@@ -476,7 +480,7 @@
   <target name="linux64-build" depends="linux-build, linux64-toolchains, linux-native-libs"
 	  description="Build linux (64-bit) version" />
 
-  <target name="linux-toolchains">
+  <target name="linux-toolchains" if="${install_toolchains}">
     <mkdir dir="linux/work/hardware/tools" />
     <copy file="linux/dist/tools/adk2install" todir="linux/work/hardware/tools" />
     <copy file="linux/dist/tools/adk2tool" todir="linux/work/hardware/tools" />
@@ -490,7 +494,7 @@
     <chmod perm="755" file="linux/work/hardware/tools/adk2install" />
   </target>
 
-  <target name="linux32-toolchains" depends="linux-toolchains">
+  <target name="linux32-toolchains" depends="linux-toolchains" if="${install_toolchains}">
     <!-- Unzip ARM tools -->
     <antcall target="unzip-arm-toolchain">
       <param name="dist_file" value="gcc-arm-none-eabi-4.4.1-2010q1-188-linux32.tar.gz" />
@@ -505,7 +509,7 @@
     </exec>
   </target>
 
-  <target name="linux64-toolchains" depends="linux-toolchains">
+  <target name="linux64-toolchains" depends="linux-toolchains" if="${install_toolchains}">
     <!-- Unzip ARM tools -->
     <antcall target="unzip-arm-toolchain">
       <param name="dist_file" value="gcc-arm-none-eabi-4.4.1-2010q1-188-linux32.tar.gz" />
@@ -689,13 +693,13 @@
     </chmod>
   </target>
 
-  <target name="windows-native-libs">
+  <target name="windows-native-libs" if="${install_native_libs}">
     <get src="http://downloads.arduino.cc/libastylej-2.03.zip" dest="windows" usetimestamp="true" />
     <unzip src="windows/libastylej-2.03.zip" dest="windows" overwrite="true"/>
     <copy file="windows/libastylej/AStylej.dll" todir="windows/work/lib" />
   </target>
 
-  <target name="windows-toolchains">
+  <target name="windows-toolchains" if="${install_toolchains}">
     <!-- Unzip AVR tools -->
     <get src="http://downloads.arduino.cc/WinAVR-20081205-arduino-2.zip" dest="windows" usetimestamp="true" skipexisting="true" verbose="true" />
     <unzip dest="windows/work/hardware" src="windows/WinAVR-20081205-arduino-2.zip" overwrite="false"/>