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From: Andi Kleen<ak@linux.intel.com>
-fwhopr=jobserver requires telling GNU make that the linker (= lto) rules support job server, so that the necessary jobserver information is passed through.
Add + to all the executable targets that run LTO for this purpose.
This improves build performance with a -fwhopr=jobserver bootstrap (or BUILD_CONFIG=bootstrap-lto) significantly.
I didn't change Ada because that apparently doesn't support LTO.
Passes bootstrap and test suite. Ok to commit?
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