Uploaded patch set 1.

Patch Set 1:

This was the quickest way for me to get TBB working.

They have a lot of CMake modules: https://github.com/01org/tbb/tree/tbb_2018/cmake

Some that should even support the CMake configuration interface with a "system" TBB without a CMake config.

Patch Set 1: Verified-1

Build Failed: CDash filtered results: https://open.cdash.org/index.php?&project=Insight&filtercount=3&field1=buildname/string&compare1=63&value1=23436-1&field2=buildstarttime/date&compare2=83&value2=2015-03-01&field3=buildstarttime/date&compare3=84&value3=2029-01-01

Patch Set 1:

This does not modify the "system" variable mechanism. The behavior before this patch was to always use system TBB. The patch changes is to always download TBB. Downloading is fine but we should have the option to use the system one.

I did not examine the code closely. Does this download binaries only for the current compiler or all the provided binaries?

Patch Set 1:

This was just a hack to get the TBB working for me. The linux binary support several compilers and include Debug/Release versions all specified in the CMake configuration file.

TBB including a CMake configuration file is a new feature. Many "system" i.e. RH7 TBB packages don't include the CMake configuration file that find_package(TBB) is looking for. I believe in the TBB source repo the have additional CMake files to interface to "legacy system" TBBs missing CMake files.

Patch Set 1:

You are right. TBB added a proper CMake support about half a year ago.