317 lines
5.5 KiB
Groff
317 lines
5.5 KiB
Groff
. \" Definitions of F, L and LR for the benefit of systems
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. \" whose -man lacks them...
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.de F
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.nh
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.if n \%\&\\$1
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.if t \%\&\f(CW\\$1\fR
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.hy 14
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..
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.de L
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.nh
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.if n \%`\\$1'
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.if t \%\&\f(CW\\$1\fR
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.hy 14
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..
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.de LR
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.nh
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.if n \%`\\$1'\\$2
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.if t \%\&\f(CW\\$1\fR\\$2
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.hy 14
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..
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.TH F2C 6
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.CT 1 prog_other
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.SH NAME
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f\^2c \(mi Convert Fortran 77 to C or C++
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.SH SYNOPSIS
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.B ~em/lib.bin/f\^2c
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[
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.I option ...
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]
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.I file ...
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.SH DESCRIPTION
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.I F2c
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converts Fortran 77 source code in
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.I files
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with names ending in
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.L .f
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or
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.L .F
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to C (or C++) source files in the
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current directory, with
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.L .c
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substituted
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for the final
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.L .f
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or
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.LR .F .
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If no Fortran files are named,
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.I f\^2c
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reads Fortran from standard input and
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writes C on standard output.
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.I File
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names that end with
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.L .p
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or
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.L .P
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are taken to be prototype
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files, as produced by option
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.LR -P ,
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and are read first.
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.PP
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The following options have the same meaning as in
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.IR f\^77 (1).
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.TP
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.B -C
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Compile code to check that subscripts are within declared array bounds.
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.TP
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.B -I2
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Render INTEGER and LOGICAL as short,
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INTEGER\(**4 as long int. Assume the default \fIlibF77\fR
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and \fIlibI77\fR: allow only INTEGER\(**4 (and no LOGICAL)
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variables in INQUIREs. Option
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.L -I4
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confirms the default rendering of INTEGER as long int.
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.TP
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.B -onetrip
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Compile DO loops that are performed at least once if reached.
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(Fortran 77 DO loops are not performed at all if the upper limit is smaller than the lower limit.)
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.TP
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.B -U
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Honor the case of variable and external names. Fortran keywords must be in
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.I
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lower
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case.
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.TP
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.B -u
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Make the default type of a variable `undefined' rather than using the default Fortran rules.
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.TP
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.B -w
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Suppress all warning messages.
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If the option is
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.LR -w66 ,
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only Fortran 66 compatibility warnings are suppressed.
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.PP
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The following options are peculiar to
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.IR f\^2c .
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.TP
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.B -A
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Produce
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.SM ANSI
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C.
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Default is old-style C.
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.TP
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.B -a
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Make local variables automatic rather than static
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unless they appear in a
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.SM "DATA, EQUIVALENCE, NAMELIST,"
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or
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.SM SAVE
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statement.
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.TP
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.B -C++
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Output C++ code.
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.TP
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.B -c
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Include original Fortran source as comments.
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.TP
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.B -E
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Declare uninitialized
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.SM COMMON
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to be
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.B Extern
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(overridably defined in
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.F f2c.h
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as
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.B extern).
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.TP
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.B -ec
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Place uninitialized
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.SM COMMON
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blocks in separate files:
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.B COMMON /ABC/
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appears in file
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.BR abc_com.c .
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Option
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.LR -e1c
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bundles the separate files
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into the output file, with comments that give an unbundling
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.IR sed (1)
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script.
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.TP
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.B -ext
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Complain about
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.IR f\^77 (1)
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extensions.
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.TP
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.B -g
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Include original Fortran line numbers as comments.
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.TP
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.B -h
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Try to align character strings on word (or, if the option is
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.LR -hd ,
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on double-word) boundaries.
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.TP
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.B -i2
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Similar to
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.BR -I2 ,
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but assume a modified
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.I libF77
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and
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.I libI77
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(compiled with
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.BR -Df\^2c_i2 ),
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so
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.SM INTEGER
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and
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.SM LOGICAL
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variables may be assigned by
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.SM INQUIRE
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and array lengths are stored in short ints.
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.TP
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.B -kr
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Use temporary values to enforce Fortran expression evaluation
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where K&R (first edition) parenthesization rules allow rearrangement.
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If the option is
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.LR -krd ,
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use double precision temporaries even for single-precision operands.
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.TP
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.B -P
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Write a
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.IB file .P
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of ANSI (or C++) prototypes
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for procedures defined in each input
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.IB file .f
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or
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.IB file .F .
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When reading Fortran from standard input, write prototypes
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at the beginning of standard output.
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Implies
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.B -A
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unless option
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.L -C++
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is present. Option
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.B -Ps
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implies
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.B -P ,
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and gives exit status 4 if rerunning
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.I f\^2c
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may change prototypes or declarations.
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.TP
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.B -p
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Supply preprocessor definitions to make common-block members
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look like local variables.
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.TP
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.B -R
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Do not promote
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.SM REAL
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functions and operations to
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.SM DOUBLE PRECISION.
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Option
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.L -!R
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confirms the default, which imitates
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.IR f\^77 .
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.TP
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.B -r
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Cast values of REAL functions (including intrinsics) to REAL.
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.TP
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.B -r8
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Promote
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.SM REAL
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to
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.SM DOUBLE PRECISION, COMPLEX
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to
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.SM DOUBLE COMPLEX.
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.TP
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.BI -T dir
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Put temporary files in directory
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.I dir.
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.TP
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.B -w8
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Suppress warnings when
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.SM COMMON
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or
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.SM EQUIVALENCE
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forces odd-word alignment of doubles.
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.TP
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.BI -W n
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Assume
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.I n
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characters/word (default 4)
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when initializing numeric variables with character data.
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.TP
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.B -z
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Do not implicitly recognize
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.SM DOUBLE COMPLEX.
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.TP
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.B -!bs
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Do not recognize \fIb\fRack\fIs\fRlash escapes
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(\e", \e', \e0, \e\e, \eb, \ef, \en, \er, \et, \ev) in character strings.
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.TP
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.B -!c
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Inhibit C output, but produce
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.B -P
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output.
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.TP
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.B -!I
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Reject
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.B include
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statements.
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.TP
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.B -!it
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Don't infer types of untyped
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.SM EXTERNAL
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procedures from use as parameters to previously defined or prototyped
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procedures.
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.TP
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.B -!P
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Do not attempt to infer
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.SM ANSI
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or C++
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prototypes from usage.
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.PP
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The resulting C invokes the support routines of
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.IR f\^77 ;
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object code should be loaded by
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.I f\^77
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or with
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.IR ld (1)
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or
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.IR cc (1)
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options
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.BR "-lF77 -lI77 -lm" .
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Calling conventions
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are those of
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.IR f\&77 :
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see the reference below.
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.br
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.SH FILES
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.TP
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.IB file .[fF]
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input file
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.TP
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.B *.c
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output file
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.TP
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.F ~em/include/fortran/f2c.h
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header file
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.SH "SEE ALSO"
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S. I. Feldman and
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P. J. Weinberger,
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`A Portable Fortran 77 Compiler',
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\fIUNIX Time Sharing System Programmer's Manual\fR,
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Tenth Edition, Volume 2, AT&T Bell Laboratories, 1990.
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.SH DIAGNOSTICS
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The diagnostics produced by
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.I f\^2c
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are intended to be
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self-explanatory.
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.SH BUGS
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Floating-point constant expressions are simplified in
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the floating-point arithmetic of the machine running
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.IR f\^2c ,
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so they are typically accurate to at most 16 or 17 decimal places.
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.br
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Untypable
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.SM EXTERNAL
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functions are declared
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.BR int .
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