.TH F77 1.SH NAMEf77 \- Fortran 77 compiler.SH SYNOPSIS.B f77[ option ] ... file ....SH DESCRIPTION.I F77is the UNIX Fortran 77 compiler.It accepts several types of arguments:.PPArguments whose names end with `.f' are taken to beFortran 77 source programs;they are compiled, andeach object program is left on the file in the current directorywhose name is that of the source with `.o' substitutedfor '.f'..PPArguments whose names end with `.r' or `.e' are taken to be Ratfor or EFLsource programs, respectively; these are first transformed by theappropriate preprocessor, then compiled by f77..PPIn the same way,arguments whose names end with `.c' or `.s' are taken to be C or assembly source programsand are compiled or assembled, producing a `.o' file..PPThe following options have the same meaning as in.IR cc (1).See.IR ld (1)for load-time options..TP.B \-cSuppress loading and produce `.o' files for each source file..TP.B \-pPrepare object files for profiling, see.IR  prof (1)..TP.SM.B \-OInvoke anobject-code optimizer..TP.SM.B \-SCompile the named programs, and leave theassembler-language output on corresponding files suffixed `.s'.(No `.o' is created.)..TP.B \-fUse a floating point interpreter (for PDP11's that lack11/70-style floating point)..TP.BR \-o " output"Name the final output file.I outputinstead of `a.out'..PPThe following options are peculiar to.IR f77 ..TP.SM.BR \-onetripCompile DO loops that are performed at least once if reached.(Fortran 77 DO loops are not performed at all if the upper limit is smaller than the lower limit.).TP.BR \-uMake the default type of a variable `undefined' rather than using the default Fortran rules..TP.BR \-CCompile code to check that subscripts are within declared array bounds..TP.BR \-wSuppress all warning messages.If the option is `\-w66', only Fortran 66 compatibility warnings are suppressed..TP.BR \-FApply EFL and Ratfor preprocessor to relevant files, put the result in the filewith the suffix changed to `.f', but do not compile..TP.BR \-mApply the M4 preprocessor to each `.r' or `.e' file before transformingit with the Ratfor or EFL preprocessor..TP.TP.BI \-E xUse the string.I xas an EFL option in processing `.e' files..TP.BI \-R xUse the string .I xas a Ratfor option in processing `.r' files..PPOther argumentsare takento be either loader option arguments, or F77-compatibleobject programs, typically produced by an earlierrun,or perhaps libraries of F77-compatible routines.These programs, together with the results of anycompilations specified, are loaded (in the ordergiven) to produce an executable program with name`a.out'..SH FILES.nf.ta \w'/usr/lib/f77rt0.o 'ufile.[fresc]	input filefile.o	object filea.out	loaded output./fort[pid].?	temporary/usr/lib/f77pass1	compiler/lib/c1	pass 2/lib/c2	optional optimizer/usr/lib/libF77.a	intrinsic function library/usr/lib/libI77.a	Fortran I/O library/lib/libc.a	C library, see section 3.fi.SH "SEE ALSO"S. I. Feldman,P. J. Weinberger,.IA Portable Fortran 77 Compiler.brprof(1), cc(1), ld(1).SH DIAGNOSTICSThe diagnostics produced by.I f77itself are intended to beself-explanatory.Occasional messages may be produced by the loader..SH BUGSThe Fortran 66 subset of the language has beenexercised extensively;the newer features have not.