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The FindOpenMP module sets up the OpenMP::OpenMP_Fortran target incorrectly, when the NAG Fortran-compiler is used. As a result, linking a binary fails with following error message:

[100%] Linking Fortran executable test                                          
NAG Fortran Compiler Release 7.0(Yurakucho) Build 7020                         
/opt/nag/7.0.20/lib/NAG_Fortran/safefit.o: In function `__NAGf90_pAlloc':       
newfit.c:(.text+0xeda0): multiple definition of `__NAGf90_pAlloc'              
/opt/nag/7.0.20/lib/NAG_Fortran/quickfit.o:newfit.c:(.text+0xbfb0): first define
d here                                                                         
/opt/nag/7.0.20/lib/NAG_Fortran/safefit.o: In function `__NAGf90_lpAlloc':      
newfit.c:(.text+0xede0): multiple definition of `__NAGf90_lpAlloc'             
/opt/nag/7.0.20/lib/NAG_Fortran/quickfit.o:newfit.c:(.text+0xbfe0): first define
d here
...

The error can be reproduced with the attached self-contained minimal example, using Release 7.0 (Buid 7020) of the NAG Fortran compiler and CMake 3.18.2.

CMakeLists.txt test.f90

As indicated in the attached CMakeLists.txt file, a workaround can be achieved by overwriting the appropriate target properties:

set_property(TARGET OpenMP::OpenMP_Fortran PROPERTY
  INTERFACE_LINK_LIBRARIES "")
set_property(TARGET OpenMP::OpenMP_Fortran PROPERTY INTERFACE_LINK_OPTIONS "-openmp")

But this is propably not the correct way to solve the issue. Any hints are welcome.