Trigger a rebuild of llvm if cling/LastKnownGoodLLVMSVNRevision.txt has changed. This file will get updated in svn when a new llvm revision is uploaded to ROOT. Copy the file to LLVMDIRO to keep track of the llvm revision used for the previous build; if new and previous differ, rebuild.
Trigger a rebuild of llvm if cling/LastKnownGoodLLVMSVNRevision.txt has changed.
This file will get updated in svn when a new llvm revision is uploaded to ROOT.
Copy the file to LLVMDIRO to keep track of the llvm revision used for the previous build; if new and previous differ, rebuild.

Create new make var LLVMDEV: if set, llvm will be built in debug mode.
Else llvm will be built in optimized mode without assertions.
Disable docs and bindings.

Split commands that can fail (mkdir) and those that can't (export VAR=...);
glue the possibly failing ones together using &&.
This ensures that we don't have a failure in some intermediate step.

make install includes make.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@45858 27541ba8-7e3a-0410-8455-c3a389f83636

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