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+.. _build_targets:
+
+=============
+Build Targets
+=============
+
+When you build with ``mach build``, there are some special targets that can be
+built. This page attempts to document them.
+
+Partial Tree Targets
+====================
+
+The targets in this section only build part of the tree. Please note that
+partial tree builds can be unreliable. Use at your own risk.
+
+export
+   Build the *export* tier. The *export* tier builds everything that is
+   required for C/C++ compilation. It stages all header files, processes
+   IDLs, etc.
+
+compile
+   Build the *compile* tier. The *compile* tier compiles all C/C++ files.
+
+libs
+   Build the *libs* tier. The *libs* tier performs linking and performs
+   most build steps which aren't related to compilation.
+
+tools
+   Build the *tools* tier. The *tools* tier mostly deals with supplementary
+   tools and compiled tests. It will link tools against libXUL, including
+   compiled test binaries.
+
+binaries:
+   Recompiles and relinks C/C++ files. Only works after a complete normal
+   build, but allows for much faster rebuilds of C/C++ code. For performance
+   reasons, however, it skips nss, nspr, icu and ffi. This is targeted to
+   improve local developer workflow when touching C/C++ code.
+
+install-manifests
+   Process install manifests. Install manifests handle the installation of
+   files into the object directory.
+
+   Unless ``NO_REMOVE=1`` is defined in the environment, files not accounted
+   in the install manifests will be deleted from the object directory.
+
+install-tests
+   Processes the tests install manifest.
+
+Common Actions
+==============
+
+The targets in this section correspond to common build-related actions. Many
+of the actions in this section are effectively frontends to shell scripts.
+These actions will likely all be replaced by mach commands someday.
+
+buildsymbols
+   Create a symbols archive for the current build.
+
+   This must be performed after a successful build.
+
+check
+   Run build system tests.