Gfortran pre-processor directives for Different Operating systems
Could you tell me please how can I do the following: #if __unix__ #define path_sep='/' #elif __windows__ #define path_sep='\' #else #error "path_sep not defined." #endif using gfortran compiler.
This can be done in combination with conditional compilation and using the "D" option on the command line. Here is some example code: program test_Dopt character (len=1) :: pathsep pathsep = "?" #ifdef WOS pathsep = "\" #endif #ifdef UOS pathsep = "/" #endif write (*, '( "pathsep is >", A1, "<")' ) pathsep end program test_Dopt Name the program with filetype F90 to cause gfortran to run the preprocessor or use -cpp on the compile line. Then pass options to the prepreprocessor by including them after D on the compile line, e.g., gfortran -DWOS. (This is more general then gfortran -- most Fortran compilers will process C-style pre-processor directives.) Then you can identify the OS outside of Fortran and pass the information to the Fortran program. You can compile your code via using the filetype F90 or -cpp.
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