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CheckFortranFunctionExists
Check if a Fortran function exists.
CHECK_FORTRAN_FUNCTION_EXISTS- 
    
CHECK_FORTRAN_FUNCTION_EXISTS(<function> <result>)where
<function>- 
      
the name of the Fortran function
 <result>- 
      
variable to store the result; will be created as an internal cache variable.
 
 
Note
This command does not detect functions in Fortran modules. In general it is recommended to use CheckSourceCompiles instead to determine if a Fortran function or subroutine is available.
The following variables may be set before calling this macro to modify the way the check is run:
CMAKE_REQUIRED_LINK_OPTIONS- 
    
New in version 3.14: A ;-list of options to add to the link command (see
try_compile()for further details). CMAKE_REQUIRED_LIBRARIES- 
    
A ;-list of libraries to add to the link command. These can be the name of system libraries or they can be Imported Targets (see
try_compile()for further details). 
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 https://cmake.org/cmake/help/v3.23/module/CheckFortranFunctionExists.html