import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

build/docs/mozbuild/index.rst

@@ -0,0 +1,41 @@
+========
+mozbuild
+========
+
+mozbuild is a Python package providing functionality used by Mozilla's
+build system.
+
+Modules Overview
+================
+
+* mozbuild.backend -- Functionality for producing and interacting with build
+  backends. A build backend is an entity that consumes build system metadata
+  (from mozbuild.frontend) and does something useful with it (typically writing
+  out files that can be used by a build tool to build the tree).
+* mozbuild.compilation -- Functionality related to compiling. This
+  includes managing compiler warnings.
+* mozbuild.frontend -- Functionality for reading build frontend files
+  (what defines the build system) and converting them to data structures
+  which are fed into build backends to produce backend configurations.
+* mozpack -- Functionality related to packaging builds.
+
+Overview
+========
+
+The build system consists of frontend files that define what to do. They
+say things like "compile X" "copy Y."
+
+The mozbuild.frontend package contains code for reading these frontend
+files and converting them to static data structures. The set of produced
+static data structures for the tree constitute the current build
+configuration.
+
+There exist entities called build backends. From a high level, build
+backends consume the build configuration and do something with it. They
+typically produce tool-specific files such as make files which can be used
+to build the tree.
+
+Piecing it all together, we have frontend files that are parsed into data
+structures. These data structures are fed into a build backend. The output
+from build backends is used by builders to build the tree.
+