Add missing dependencies on installed DDC

[tpadioleau]

• declare missing dependencies in DDCConfig.cmake
• install missing FindLAPACKE.cmake, required by DDC when using splines
• add CI test

It seems to be working but could be further improved in future PR.

• The headers related to fft, splines and the PDI wrapper of DDC are being installed whatever the values of the cmake options. I think it could improved with some reorganization.

• Cmake targets about the fft and splines are missing.

• We should look at cmake components. As long as the user can adapt it looks ok

find_package(DDC REQUIRED)

add_executable(main main.cpp)
target_link_libraries(main PRIVATE DDC::DDC)

if(DDC_BUILD_PDI_WRAPPER)
    target_link_libraries(main PRIVATE DDC::PDI_Wrapper)
endif()

but as soon as a user requires an option this looks bad

find_package(DDC REQUIRED)

if(NOT DDC_BUILD_KERNELS_FFT)
    message(FATAL_ERROR "Expecting DDC_BUILD_KERNELS_FFT=ON")
endif()

• DDC lacks a header configuration file to list enabled options. These are passed as "compile definition" but pollute the user side.

[yasahi-hpc]

If you added install_test, should you also apply format check to that directory?

ddc/.github/workflows/tests.yml

Line 19 in 579427b

source: 'benchmarks/ examples/ include/ddc/ tests/'

[tpadioleau]

If you added install_test, should you also apply format check to that directory?

ddc/.github/workflows/tests.yml

Line 19 in 579427b

source: 'benchmarks/ examples/ include/ddc/ tests/'

Indeed good catch