tree c5a691a555b4ad9cb5cc3b973570fde6ec0aa897
parent dbd80e23d43c883e01b5597577364327617dc2ef
author Andrew Scull <ascull@google.com> 1531408454 +0100
committer Andrew Scull <ascull@google.com> 1531408454 +0100

Makefile: optionally compile with clang

Different compilers can produce different warnings so having the option
to use gcc or clang lets us take advantage of that. Clang is also the
preferred compiler for Android projects.

The clang build fails at the moment but this adds the infrastructure to
select clang as the compiler with the `CLANG` environment variable:

    CLANG=1 make

Change-Id: I2dd5e8ce8e7fc20e93f5780348726a2f9b76239b