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This is the second try. This time we disable this feature if no Polly checkout is available. For this to work we need to check if tools/polly is present early enough that our decision is known before cmake generates Config/config.h. With Polly checked into LLVM it was since a long time possible to compile clang/opt/bugpoint with Polly support directly linked in, instead of only providing Polly as a separate loadable module. This commit switches the default from providing Polly as a module to linking Polly into tools, such that it becomes unnecessary to load the Polly module when playing with Polly. Such configuration has shown a lot more convenient for day-to-day Polly use. This change does not impact the default behavior of any tool, if Polly is not explicitly enabled when calling clang/opt/bugpoint Polly does not affect compilation. This change also does not impact normal LLVM/clang checkouts that do not contain Polly. Reviewers: jdoerfert, Meinersbur Subscribers: pollydev, llvm-commits Differential Revision: http://reviews.llvm.org/D19711 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268048 91177308-0d34-0410-b5e6-96231b3b80d8
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