Compilation error due to MPI and missing FORTRAN
When trying to compile Online on machines where it says:
-- +======================================================================+
-- | PCIE40 DAQ found. EventBuilding libraries shall be built. |
-- +======================================================================+the compilation fails with:
-- Could NOT find MPI_C (missing: MPI_C_LIB_NAMES MPI_C_HEADER_DIR MPI_C_WORKS)
-- Could NOT find MPI_CXX (missing: MPI_CXX_LIB_NAMES MPI_CXX_HEADER_DIR MPI_CXX_WORKS)
CMake Error at /cvmfs/lhcb.cern.ch/lib/var/lib/LbEnv/2062/stable/linux-64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:218 (message):
Could NOT find MPI (missing: MPI_C_FOUND MPI_CXX_FOUND)
Reason given by package: MPI component 'Fortran' was requested, but language Fortran is not enabled.
Call Stack (most recent call first):
/cvmfs/lhcb.cern.ch/lib/var/lib/LbEnv/2062/stable/linux-64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:582 (_FPHSA_FAILURE_MESSAGE)
/cvmfs/lhcb.cern.ch/lib/var/lib/LbEnv/2062/stable/linux-64/share/cmake-3.19/Modules/FindMPI.cmake:1722 (find_package_handle_standard_args)
Online/EventBuilding/CMakeLists.txt:38 (find_package)
-- Configuring incomplete, errors occurred!
Is there something wrong with the CMake file and is there a fix which does not involve removing the EventBuilding package? Compilation works on machines where PCIE40 DAQ is not found. That is also why it does not fail in the nightlies.