On Nov 21, 2011, at 5:40 PM, Andy Fleming wrote:
The MAKEALL script cleverly runs make with the appropriate options to use all of the cores on the system, but your average U-Boot build can't make much use of more than a few cores. If you happen to have a many-core server, your builds will leave most of the system idle.
In order to make full use of such a system, we need to build multiple targets in parallel, and this requires directing make output into multiple directories. We add a BUILD_NBUILDS variable, which allows users to specify how many builds to run in parallel. When BUILD_NBUILDS is set greater than 1, we redefine BUILD_DIR for each build to be ${BUILD_DIR}/${target}. Also, we make "./build" the default BUILD_DIR when BUILD_NBUILDS is greater than 1.
MAKEALL now tracks which builds are still running, and when one finishes, it starts a new build.
Once each build finishes, we run "make tidy" on its directory, to reduce the footprint.
As a result, we are left with a build directory with all of the built targets still there for use, which means anyone who wanted to use MAKEALL as part of a test harness can now do so.
Signed-off-by: Andy Fleming afleming@freescale.com
v2: - Update to keep BUILD_NBUILDS builds in flight, rather than batching
- Clean up style things
- Defer error output until build completion to make output *slightly*
more readable
Can you re-fresh patch against top of tree.
- k