F2C 1
Table of contents
f2c - Convert Fortran 77 to C or C++
f\^2c
[
option
]
file
F2c
converts Fortran 77 source code in
files
with names ending in
or
to C (or C++) source files in the
current directory, with
substituted
for the final
or
If no Fortran files are named,
f\^2c
reads Fortran from standard input and
writes C on standard output.
File
names that end with
or
are taken to be prototype
files, as produced by option
and are read first.
The following options have the same meaning as in
f\^77(1).
-
-C
-
Compile code to check that subscripts are within declared array bounds.
-
-I2
-
Render INTEGER and LOGICAL as short,
INTEGER\(**4 as long int. Assume the default libF77
and libI77: allow only INTEGER\(**4 (and no LOGICAL)
variables in INQUIREs. Option
confirms the default rendering of INTEGER as long int.
-
-Idir
-
Look for a non-absolute include file first in the directory of the
current input file, then in directories specified by \f(CW-I
options (one directory per option). Options
\f(CW-I2 and \f(CW-I4
have precedence, so, e.g., a directory named \f(CW2
should be specified by \f(CW-I./2 .
-
-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.)
-
-U
-
Honor the case of variable and external names. Fortran keywords must be in
lower
case.
-
-u
-
Make the default type of a variable `undefined' rather than using the default Fortran rules.
-
-w
-
Suppress all warning messages, or, if the option is
just Fortran 66 compatibility warnings.
The following options are peculiar to
f\^2c.
-
-A
-
Produce
ANSI
C.
Default is old-style C.
-
-a
-
Make local variables automatic rather than static
unless they appear in a
DATA, EQUIVALENCE, NAMELIST,
or
SAVE
statement.
-
-C++
-
Output C++ code.
-
-c
-
Include original Fortran source as comments.
-
-cd
-
Do not recognize cdabs, cdcos, cdexp, cdlog, cdsin, and cdsqrt
as synonyms for the double complex intrinsics
zabs, zcos, zexp, zlog, zsin, and zsqrt, respectively,
nor dreal as a synonym for dble.
-
-ddir
-
Write
files in directory
dir
instead of the current directory.
-
-E
-
Declare uninitialized
COMMON
to be
Extern
(overridably defined in
as
extern).
-
-ec
-
Place uninitialized
COMMON
blocks in separate files:
COMMON
appears in file
abc_com.c.
Option
bundles the separate files
into the output file, with comments that give an unbundling
sed(1)
script.
-
-ext
-
Complain about
f\^77(1)
extensions.
-
-f
-
Assume free-format input: accept text after column 72 and do not
pad fixed-format lines shorter than 72 characters with blanks.
-
-72
-
Treat text appearing after column 72 as an error.
-
-g
-
Include original Fortran line numbers in \f(CW#line lines.
-
-h
-
Emulate Fortran 66's treatment of Hollerith: try to align character strings on
word (or, if the option is
on double-word) boundaries.
-
-i2
-
Similar to
-I2,
but assume a modified
libF77
and
libI77
(compiled with
-Df\^2c_i2),
so
INTEGER
and
LOGICAL
variables may be assigned by
INQUIRE
and array lengths are stored in short ints.
-
-i90
-
Do not recognize the Fortran 90 bit-manipulation intrinsics
btest, iand, ibclr, ibits, ibset, ieor, ior, ishft, and ishftc.
-
-kr
-
Use temporary values to enforce Fortran expression evaluation
where K&R (first edition) parenthesization rules allow rearrangement.
If the option is
use double precision temporaries even for single-precision operands.
-
-P
-
Write a
file.P
of ANSI (or C++) prototypes
for definitions in each input
file.f
or
file.F.
When reading Fortran from standard input, write prototypes
at the beginning of standard output. Option
-Ps
implies
-P
and gives exit status 4 if rerunning
f\^2c
may change prototypes or declarations.
-
-p
-
Supply preprocessor definitions to make common-block members
look like local variables.
-
-R
-
Do not promote
REAL
functions and operations to
DOUBLE
Option
confirms the default, which imitates
f\^77.
-
-r
-
Cast REAL arguments of intrinsic functions and values of REAL
functions (including intrinsics) to REAL.
-
-r8
-
Promote
REAL
to
DOUBLE
to
DOUBLE
-
-s
-
Preserve multidimensional subscripts. Suppressed by option
.
-
-Tdir
-
Put temporary files in directory
dir.
-
-trapuv
-
Dynamically initialize local variables, except those appearing in
SAVE
or
DATA
statements, with values that may help find references to
uninitialized variables. For example, with IEEE arithmetic,
initialize local floating-point variables to signaling NaNs.
-
-w8
-
Suppress warnings when
COMMON
or
EQUIVALENCE
forces odd-word alignment of doubles.
-
-Wn
-
Assume
n
characters/word (default 4)
when initializing numeric variables with character data.
-
-z
-
Do not implicitly recognize
DOUBLE
-
-!bs
-
Do not recognize backslash escapes
(\", \', , \, \b, \f, \n, \r, \t, \v) in character strings.
-
-!c
-
Inhibit C output, but produce
-P
output.
-
-!I
-
Reject
include
statements.
-
-!i8
-
Disallow
INTEGER*8
or, if the option is
permit
INTEGER*8
but do not promote integer
constants to
INTEGER*8
when they involve more than 32 bits.
-
-!it
-
Don't infer types of untyped
EXTERNAL
procedures from use as parameters to previously defined or prototyped
procedures.
-
-!P
-
Do not attempt to infer
ANSI
or C++
prototypes from usage.
The resulting C invokes the support routines of
f\^77;
object code should be loaded by
f\^77
or with
ld(1)
or
cc(1)
options
-lF77 -lI77 -lm.
Calling conventions
are those of
f77:
see the reference below.
-
.nr )I 1.75i
-
file.[fF]
input file
-
*.c
-
output file
-
.F /usr/include/f2c.h
-
header file
-
.F /usr/lib/libF77.a
-
intrinsic function library
-
.F /usr/lib/libI77.a
-
Fortran I/O library
-
.F /lib/libc.a
-
C library, see section 3
S. I. Feldman and
P. J. Weinberger,
`A Portable Fortran 77 Compiler',
UNIX Time Sharing System Programmer's Manual,
Tenth Edition, Volume 2, AT&T Bell Laboratories, 1990.
The diagnostics produced by
f\^2c
are intended to be
self-explanatory.
Floating-point constant expressions are simplified in
the floating-point arithmetic of the machine running
f\^2c,
so they are typically accurate to at most 16 or 17 decimal places.
Untypable
EXTERNAL
functions are declared
int.
There is no notation for
INTEGER*8
constants.
Some intrinsic functions do not yet work with
INTEGER*8