Add new development platforms: linux_arm, linux_i686 and linux_x86_64

examples/desktop/hello-world/platformio.ini

@@ -22,3 +22,23 @@ platform = native
 
 [env:win32]
 platform = windows_x86
+
+#
+# If host OS is Mac OS X
+#
+
+# [env:darwin_x86_64]
+# platform = native
+
+# [env:linux_i686]
+# platform = linux_i686
+
+# [env:linux_x86_64]
+# platform = linux_x86_64
+
+# [env:windows_x86]
+# platform = windows_x86
+
+# [env:linux_armv6l]
+# platform = linux_arm
+# build_flags = -march=armv6