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BuildSystem.md

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Build system

Overall description

Work in progress.

Test program specific notes

Kokkos

When Kokkos runtime library is built with CUDA backend, all files including any Kokkos header need to be compiled with nvcc (to leading order, at least). In addition, the aim is to build all the portable code for both CPU serial and CUDA backends. There is, however, some backend-independent code that needs to be built with nvcc because of the inclusion of a Kokkos header. The build rules to handle all that are as follows

  • Code including a Kokkos header that is backend-independent should be placed in <package>/kokkoshost/<filename>.cc
    • Such files are compiled with nvcc, but no special macros are set
    • The resulting object file participates in the device link for that package
  • Portable (i.e. backend-dependent) code should be placed in <package>/kokkos/<filename>.cc
    • Such files are compiled with nvcc twice, once for CPU serial backend with KOKKOS_BACKEND_SERIAL macro defined, and once for the CUDA backend with KOKKOS_BACKEND_CUDA macro defined
      • We should try hard to avoid depending on these macros in user code, and try to provide abstractions in KokkosCore/kokkosConfig.h instead
    • The resulting object files participate in the device link for that package