In lieu of having an environment variable to override prebuilts
preferences (for now), fall back to prebuilts whenever the source
module is disabled. Complicated source modules (like LLVM) that
already have Go logic can then use an environment variariable to
disable their source module whenever they want to use prebuilts.
Computes UsePrebuilt once using information from both the source
and prebuilt modules, and stores the result in the prebuilt module.
Test: m -j libLLVM
Test: m -j libLLVM FORCE_BUILD_LLVM_COMPONENTS=true
Change-Id: Ib0819a03e9492e55f55de3402e05b3a043644a39
If the source module is being used instead of the prebuilt module,
disable installing the prebuilt module.
Test: m -j checkbuild
Change-Id: I55e77021b0f9572b0737d960cba89274f696775d
Support prebuilt shared libraries as an initial proof-of-concept of
prebuilts. Future changes will support binaries and static libraries,
and the ability to select which to use based on something besides
blueprint properties.
Test: TestPrebuilts run during m -j
Change-Id: I6e84da667e9005ae11844bad01d25cbe4ced1ce3
