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.F90 filename.FOR filename.FTN filename.FPP	Fortran fixed-form source	Preprocessed by the Intel Fortran preprocessor fpp; then 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 (IA-32 compiler) or the Intel Itanium® assembler (Itanium-based compiler).
filename.o	Compiled object file	Passed to ld.

You can use the compiler configuration file to specify default directories for input libraries. To specify additional directories for input files, temporary files, libraries, and for the files used by the assembler and the linker, use compiler options that specify output file and directory names.