GPU: give Metal a column in the tuning parameter table

[ktf]

Without one, GPUDefParametersDefaultsDevice.h falls through to
'#error GPU TYPE NOT SET' for GPUCA_GPUTYPE_METAL, which the .metal source
defines, so nothing under Definitions/ could be compiled for the backend at all.

The values are copied from OPENCL, the other portable backend with no
vendor-specific tuning, so Metal starts at WARP_SIZE 32 and
THREAD_COUNT_DEFAULT 256. Real numbers want measuring on a device once the
kernels run. The column is appended last, as the earlier ones were; the order
is cosmetic, since the generator keys off the architecture name.

detect_gpu_arch reports METAL alongside the others so the generator emits the
block. Every existing architecture comes out byte-identical; the generated
device header gains only the Metal block and the architecture comment.

[alibuild]

Error while checking build/O2/fullCI_slc9 for 10b5bd3 at 2026-10-03 07:09:

-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindOpenMPMacOS.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindRapidJSON.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindFairRoot.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindAliRoot.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindVGM.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindGeant4.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindAliceGridUtils.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindlibjalienO2.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindGLFW.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindXRootD.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/O2SimulationDependencies.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindHepMC3.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindO2GPUWayland.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/Findpythia6.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindGeant4VMC.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindLibUV.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/Findpythia.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindFlukaVMC.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindVMC.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindGeant3.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindMCStepLogger.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindVtune.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindHepMC.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindJAliEnROOT.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/FindO2GPU.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/CMakeLists.txt
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/O2CompileFlags.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/O2TestsAdapter.cmake
-- Installing: /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/lib/cmake/O2/O2Dependencies.cmake
+ mkdir -p /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/etc/modulefiles
+ rsync -a --delete etc/modulefiles/ /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11/etc/modulefiles
+ cp /sw/BUILD/a573ca3531dea6ac70d6081237dc1afe1d70696b/O2/compile_commands.json /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local11
++ readlink /sw/SOURCES/O2/slc9_x86-64-slc9_x86-64/0
+ DEVEL_SOURCES=/O2
+ '[' /O2 '!=' /sw/SOURCES/O2/slc9_x86-64-slc9_x86-64/0 ']'
+ perl -p -i -e 's|/sw/SOURCES/O2/slc9_x86-64-slc9_x86-64/0|/O2|' compile_commands.json
+ ln -sf /sw/BUILD/a573ca3531dea6ac70d6081237dc1afe1d70696b/O2/compile_commands.json /O2/compile_commands.json
+ [[ -n '' ]]
+ checkFindO2GPU
+ [[ -n /alidist ]]
+ [[ -f /alidist/resources/FindO2GPU.cmake ]]
+ cmp -s /alidist/resources/FindO2GPU.cmake /sw/SOURCES/O2/slc9_x86-64-slc9_x86-64/0/dependencies/FindO2GPU.cmake
++ grep '# FindO2GPU.cmake Version ' /alidist/resources/FindO2GPU.cmake
++ awk '{print $4}'
++ grep '# FindO2GPU.cmake Version ' /sw/SOURCES/O2/slc9_x86-64-slc9_x86-64/0/dependencies/FindO2GPU.cmake
++ awk '{print $4}'
+ [[ ! 21 -gt 21 ]]
+ echo 'FindO2GPU.cmake differs in O2 compared to alidist, please sync O2/dependencies/FindO2GPU.cmake to alidist/resources and make sure to update the version number'
FindO2GPU.cmake differs in O2 compared to alidist, please sync O2/dependencies/FindO2GPU.cmake to alidist/resources and make sure to update the version number
+ exit 1

Full log here.