Ninja can't depend on environment variables, so modifying build
behavior based on environment variables requires coordinating
between the soong script that invokes ninja and the soong_build
manifest generator.
Allow any module to call Config.Getenv to get the contents of an
environment variable while registering a dependency on it.
After all modules have been processed write out the state of
all used environment variables to a JSON file called
.soong.environment. During the next build the soong script
will use the soong_env tool to compare the contents of
.soong.environment to the current environment, and force a
build manifest regeneration by deleting the .soong.environment
file if any variables have changed.
Change-Id: Id0d81933a857bc2fc1cd7a393a3c6cec73dc4824
Modules can choose to add "installed files", which are files that
a product can depend on to cause the module to build, and "checkbuild
files", which will only be built if another module that needs to build
depends on them. For every target, add a module-install and a
module-checkbuild target that create dependencies on those files,
and then add a global checkbuild target that depends on all the
module-checkbuild targets. Also add a module target for each module
that depends on module-install and module-checkbuild.
Change-Id: I801389ad6ab9806b71d92cd327a0f9cb7582e0df
Initial build logic for building android with soong. It can build
a variety of C and C++ files for arm/arm64 and host.
Change-Id: I10eb37c2c2a50be6af1bb5fd568c0962b9476bf0
This creates the infrastructure that will be used to bootstrap the
soong primary builder through blueprint and ninja.
Change-Id: Iebed8f369e4db41b207d0b2a48a7a54a4dd7d45d
