tree edc45d90d4aa0e09736275755fca35ab6d63103e
parent fb3d3fba791b5b200293d23f08b778ecae34e02f
author Alexei Frolov <frolv@google.com> 1591811164 -0700
committer Wyatt Hepler <hepler@google.com> 1592326259 -0700

Define Linux clang target as toolchain

This change configures the Linux clang -Og target as a toolchain with
args. To support this, all Pigweed variables from pw_vars_default are
made into build args, defined within their respective modules.

The Linux clang target/toolchain is the only one that currently works.
Pigweed's other targets will be ported in later changes.

Change-Id: I051e29fde7577e41a3184c37031a4e04936404e1