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CMake infrastructure

Features

Building

The scripts intended to mimic the capabilities of the original GNU Makefiles but enhance them with a little CMake awesome. The scripts start off as:

#
# Behavioural options for the solution
#
  option(TRISYCL_OPENMP "triSYCL multi-threading with OpenMP" ON)
  option(TRISYCL_NO_ASYNC "triSYCL use synchronous kernel execution" OFF)
  option(BUILD_OPENCL "triSYCL build OpenCL tests" ON)
  option(BUILD_XILINX "triSYCL build Xilinx-specific tests" OFF)
  option(TRISYCL_DEBUG "triSCYL use debug mode" OFF)
  option(TRISYCL_DEBUG_STRUCTORS "triSYCL trace of object lifetimes" OFF)

  set(CL_SYCL_LANGUAGE_VERSION 220 CACHE VERSION "Host language version to be used by trisYCL (default is: 220)")
  set(TRISYCL_CL_LANGUAGE_VERSION 220 CACHE VERSION "Device language version to be used by trisYCL (default is: 220) (not used yet)")

These variables can be set from the command-line at configuration time. The default values I hope make sense for the vast majority of development scenarios.

Testing

The scripts also hook unit testing into the familiar CTest framework. These scripts do not rely on LIT being present (one less dependency), because none of the unit tests used any features that are not present in CTest. CTest produces similarly sexy output as LIT, can test exit codes and match stdout vs. a regex.

Warning-free

As a good habit of mine, I raise the warning level on all compilers to the highest value, and went ahead and disabled warnings specifically that triggered in any of the tests. I would like to invite all devs to take on their favorite compiler they use to develop/consume triSYCL and get rid of all the warnings one by one. Some are fairly banal, but some may be quite severe.

Notes

The multiple_compilation_units tests fails on almost all compilers with the output being scrambled even though the NO_BARRIER define is set in code. What is the reason for this?

add_compile_options("/wd4459") # warning C4459: declaration of '<id>' hides global declaration
add_compile_options("/wd4456") # warning C4456: declaration of '<id>' hides previous local declaration

For instance in the case of MSVC is either a two-phase name lookup error or a potential source of a serious bug. These options can be found in the top-level CMakeLists.txt file for all compilers.

Tested platforms

Windows 10 + VS 15 + Boost 1.63.0

Importing the environment of a developer command prompt, (and having the Ninja build system for eg. on the path), one can do something like:

PS C:\Users\Matty\Build\triSYCL> Import-CmdEnvironment 'C:\Kellekek\Microsoft\Visual Studio\15RC\VC\Auxiliary\Build\vcvars64.bat'
PS C:\Users\Matty\Build\triSYCL> cmake.exe -G"Ninja" -DBoost_COMPILER="-vc140" C:\Users\Matty\Source\Repos\triSYCL\

This creates Ninja makefiles that can be invoked as simply as:

PS C:\Users\Matty\Build\triSYCL> cmake --build .

which essentially invokes the underlying build systems 'all' target. After build is complete, one can run tests simply by typing:

PS C:\Users\Matty\Build\triSYCL> ctest

which essentially invokes the underlying build systems 'test' target.

Notes

Because the FindBoost.cmake scripts wrongly expected the toolset of VS 15 to be v150 (instead of v141) one manually has to set the toolset version by configuring using -DBoost_COMPILER="-vc140". One might ask: why 140 and not 141? Because even the coming Boost 1.64 does not compile with the new toolset, due to it having gone ahead and riding the STL of deprecated STL functions such as std::unary_function which Boost does not handle yet.

Ubuntu 16.04 (WSL) + GCC 6.2 + Boost 1.58.0

Configure using:

mnagy@MATTY-Z50-75:~/build/triSYCL/gcc-6.2$ cmake -DCMAKE_C_COMPILER=gcc-6 -DCMAKE_CXX_COMPILER=g++-6 /mnt/c/Users/Matty/Source/Repos/triSYCL/

Building using:

mnagy@MATTY-Z50-75:~/build/triSYCL/gcc-6.2$ cmake --build . -- -j5

Testing:

mnagy@MATTY-Z50-75:~/build/triSYCL/gcc-6.2$ ctest

Ubuntu 16.04 (WSL) + Clang 4.0 + Boost 1.58.0

Configure using:

mnagy@MATTY-Z50-75:~/build/triSYCL/clang-4.0$ cmake -DCMAKE_C_COMPILER=clang-4.0 -DCMAKE_CXX_COMPILER=clang++-4.0 -DTRISYCL_OPENMP=OFF /mnt/c/Users/Matty/Source/Repos/triSYCL/

Building using:

mnagy@MATTY-Z50-75:~/build/triSYCL/clang-4.0$ cmake --build . -- -j5

Testing:

mnagy@MATTY-Z50-75:~/build/triSYCL/clang-4.0$ ctest

Notes

I could not get Clang actually work with OpenMP. It throws a runtime (?!?!) exception for using unimplemented feature. Otherwise omitting OpenMP results in some dead-locking tests.