This isn't an SDK but it is a fairly practical way to build Fuchsia software out of tree. It's really most useful for porting legacy software.

This is not an official Google product.

Add the manifest to your Fuchsia checkout with jiri:

jiri import -name=sdk-manifest sdk https://github.com/ianloic/fuchsia-sdk-manifest.git
jiri update

Include the sdk in your build:

packages/gn/gen.py --modules=packages/gn/default,sdk/module

Then do a build...

The SDK build relies on the packages/gn/desc.py script, which hard-codes debug, so the build should be a debug build.

The build produces the following outputs in an sdk directory under your output directory, for example //out/debug-x86-64/sdk/:

• lib/libfuchsia.a -- a static library that links in everything from the Fuchsia tree that a C++ app that uses Modular, FIDL and Mozart might want, except those libraries in Fuchsia's sysroot (ie, libmagenta, libmxio, ...).
• include/** -- all includes required to make use of libfuchsia.a, minus those found in the Fuchsia sysroot.
• fuchsia.makevars -- a file that can be included in a Makefile that sets CC, CXX, LD, CFLAGS, CXXFLAGS, LDFLAGS and LIBS appropriately.

• Generate files to help building with autoconf, CMake, directly in the shell
• Generate pkg-config directory for use w/ autoconf