+.TH F77 1
+.SH NAME
+f77 \- Fortran 77 compiler
+.SH SYNOPSIS
+.B f77
+[ option ] ... file ...
+.SH DESCRIPTION
+.I F77
+is the UNIX Fortran 77 compiler.
+It accepts several types of arguments:
+.PP
+Arguments whose names end with `.f' are taken to be
+Fortran 77 source programs;
+they are compiled, and
+each object program is left on the file in the current directory
+whose name is that of the source with `.o' substituted
+for '.f'.
+.PP
+Arguments whose names end with `.r' or `.e' are taken to be Ratfor or EFL
+source programs, respectively; these are first transformed by the
+appropriate preprocessor, then compiled by f77.
+.PP
+In the same way,
+arguments whose names end with `.c' or `.s' are taken to be C or assembly source programs
+and are compiled or assembled, producing a `.o' file.
+.PP
+The following options have the same meaning as in
+.IR cc (1).
+See
+.IR ld (1)
+for load-time options.
+.TP
+.B \-c
+Suppress loading and produce `.o' files for each source
+file.
+.TP
+.B \-g
+Have the compiler produce additional symbol table information for
+.IR sdb (1).
+Also pass the
+.B \-lg
+flag to
+.IR ld (1).
+.TP
+.B \-z
+Create load-on-demand format output (an
+.IR ld (1)
+flag); this is important to specify when loading certain very large programs.
+See
+.IR ld (1).
+.TP
+.B \-p
+Prepare object files for profiling, see
+.IR prof (1).
+.TP
+.SM
+.B \-O
+Invoke an
+object-code optimizer.
+.TP
+.SM
+.B \-S
+Compile the named programs, and leave the
+assembler-language output on corresponding files suffixed `.s'.
+(No `.o' is created.).
+.TP
+.B \-f
+Use a floating point interpreter (for PDP11's that lack
+11/70-style floating point).
+.TP
+.BR \-o " output"
+Name the final output file
+.I output
+instead of `a.out'.
+.PP
+The following options are peculiar to
+.IR f77 .
+.TP
+.SM
+.BR \-onetrip
+Compile 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 \-u
+Make the default type of a variable `undefined' rather than using the default Fortran rules.
+.TP
+.BR \-C
+Compile code to check that subscripts are within declared array bounds.
+.TP
+.BR \-w
+Suppress all warning messages.
+If the option is `\-w66', only Fortran 66 compatibility warnings are suppressed.
+.TP
+.BR \-F
+Apply EFL and Ratfor preprocessor to relevant files, put the result in the file
+with the suffix changed to `.f', but do not compile.
+.TP
+.BR \-m
+Apply the M4 preprocessor to each `.r' or `.e' file before transforming
+it with the Ratfor or EFL preprocessor.
+.TP
+.TP
+.BI \-E x
+Use the string
+.I x
+as an EFL option in processing `.e' files.
+.TP
+.BI \-R x
+Use the string
+.I x
+as a Ratfor option in processing `.r' files.
+.PP
+Other arguments
+are taken
+to be either loader option arguments, or F77-compatible
+object programs, typically produced by an earlier
+run,
+or perhaps libraries of F77-compatible routines.
+These programs, together with the results of any
+compilations specified, are loaded (in the order
+given) to produce an executable program with name
+`a.out'.
+.SH FILES
+.nf
+.ta \w'/usr/lib/libF77.a 'u
+file.[fresc] input file
+file.o object file
+a.out loaded output
+./fort[pid].? temporary
+/usr/lib/f77pass1 compiler
+/lib/f1 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,
+.I
+A Portable Fortran 77 Compiler
+.br
+prof(1), cc(1), ld(1)
+.SH DIAGNOSTICS
+The diagnostics produced by
+.I f77
+itself are intended to be
+self-explanatory.
+Occasional messages may be produced by the loader.
+.SH BUGS
+The Fortran 66 subset of the language has been
+exercised extensively;
+the newer features have not.
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