Input Files and Filename Extensions

The Intel Fortran Compiler interprets the type of each input file by its filename extension, such as .a, .f, .for, .o, and so on:

Filename	Interpretation	Action
filename.a	Object library	Passed to ld.
filename.f filename.ftn filename.for filename.i	Fortran fixed-form source	Compiled by the Intel® Fortran compiler.
filename.fpp filename.F filename.FOR filename.FTN filename.FPP	Fortran fixed-form source	Must be preprocessed by the Intel Fortran preprocessor fpp before being compiled by the Intel Fortran compiler.
filename.F90	Fortran free-form source	Must be preprocessed by the Intel Fortran preprocessor fpp before being compiled by the Intel Fortran compiler.
filename.f90 filename.i90	Fortran free-form source	Compiled by the Intel Fortran compiler.
filename.s	Assembly file	Passed to the assembler.
filename.o	Compiled object file	Passed to ld.

You can use the compiler configuration file to specify default directories for input libraries.