2
F2C(1) UNIX System V F2C(1)
5
f2c - Convert Fortran 77 to C or C++
8
f2c [ option ... ] file ...
11
F2c converts Fortran 77 source code in files with names end-
12
ing in `.f' or `.F' to C (or C++) source files in the cur-
13
rent directory, with `.c' substituted for the final `.f' or
14
`.F'. If no Fortran files are named, f2c reads Fortran from
15
standard input and writes C on standard output. File names
16
that end with `.p' or `.P' are taken to be prototype files,
17
as produced by option `-P', and are read first.
19
The following options have the same meaning as in f77(1).
21
-C Compile code to check that subscripts are within
22
declared array bounds.
24
-I2 Render INTEGER and LOGICAL as short, INTEGER*4 as long
25
int. Assume the default libF77 and libI77: allow only
26
INTEGER*4 (and no LOGICAL) variables in INQUIREs.
27
Option `-I4' confirms the default rendering of INTEGER
31
Look for a non-absolute include file first in the
32
directory of the current input file, then in directo-
33
ries specified by -I options (one directory per
34
option). Options -I2 and -I4 have precedence, so,
35
e.g., a directory named 2 should be specified by -I./2
39
Compile DO loops that are performed at least once if
40
reached. (Fortran 77 DO loops are not performed at all
41
if the upper limit is smaller than the lower limit.)
43
-U Honor the case of variable and external names. Fortran
44
keywords must be in lower case.
46
-u Make the default type of a variable `undefined' rather
47
than using the default Fortran rules.
49
-w Suppress all warning messages, or, if the option is
50
`-w66', just Fortran 66 compatibility warnings.
52
The following options are peculiar to f2c.
54
-A Produce ANSI C. Default is old-style C.
56
Page 1 (printed 5/12/96)
58
F2C(1) UNIX System V F2C(1)
60
-a Make local variables automatic rather than static
61
unless they appear in a DATA, EQUIVALENCE, NAMELIST, or
66
-c Include original Fortran source as comments.
68
-cd Do not recognize cdabs, cdcos, cdexp, cdlog, cdsin, and
69
cdsqrt as synonyms for the double complex intrinsics
70
zabs, zcos, zexp, zlog, zsin, and zsqrt, respectively.
73
Write `.c' files in directory dir instead of the cur-
76
-E Declare uninitialized COMMON to be Extern (overridably
77
defined in f2c.h as extern).
79
-ec Place uninitialized COMMON blocks in separate files:
80
COMMON /ABC/ appears in file abc_com.c. Option `-e1c'
81
bundles the separate files into the output file, with
82
comments that give an unbundling sed(1) script.
84
-ext Complain about f77(1) extensions.
86
-f Assume free-format input: accept text after column 72
87
and do not pad fixed-format lines shorter than 72 char-
90
-72 Treat text appearing after column 72 as an error.
92
-g Include original Fortran line numbers in #line lines.
94
-h Emulate Fortran 66's treatment of Hollerith: try to
95
align character strings on word (or, if the option is
96
`-hd', on double-word) boundaries.
98
-i2 Similar to -I2, but assume a modified libF77 and libI77
99
(compiled with -Df2c_i2), so INTEGER and LOGICAL vari-
100
ables may be assigned by INQUIRE and array lengths are
101
stored in short ints.
103
-i90 Do not recognize the Fortran 90 bit-manipulation
104
intrinsics btest, iand, ibclr, ibits, ibset, ieor, ior,
107
-kr Use temporary values to enforce Fortran expression
108
evaluation where K&R (first edition) parenthesization
109
rules allow rearrangement. If the option is `-krd',
110
use double precision temporaries even for single-
113
Page 2 (printed 5/12/96)
115
F2C(1) UNIX System V F2C(1)
117
-P Write a file.P of ANSI (or C++) prototypes for defini-
118
tions in each input file.f or file.F. When reading
119
Fortran from standard input, write prototypes at the
120
beginning of standard output. Option -Ps implies -P
121
and gives exit status 4 if rerunning f2c may change
122
prototypes or declarations.
124
-p Supply preprocessor definitions to make common-block
125
members look like local variables.
127
-R Do not promote REAL functions and operations to DOUBLE
128
PRECISION. Option `-!R' confirms the default, which
131
-r Cast values of REAL functions (including intrinsics) to
134
-r8 Promote REAL to DOUBLE PRECISION, COMPLEX to DOUBLE
137
-s Preserve multidimensional subscripts. Suppressed by
141
Put temporary files in directory dir.
143
-w8 Suppress warnings when COMMON or EQUIVALENCE forces
144
odd-word alignment of doubles.
146
-Wn Assume n characters/word (default 4) when initializing
147
numeric variables with character data.
149
-z Do not implicitly recognize DOUBLE COMPLEX.
151
-!bs Do not recognize backslash escapes (\", \', \0, \\, \b,
152
\f, \n, \r, \t, \v) in character strings.
154
-!c Inhibit C output, but produce -P output.
156
-!I Reject include statements.
158
-!i8 Disallow INTEGER*8.
160
-!it Don't infer types of untyped EXTERNAL procedures from
161
use as parameters to previously defined or prototyped
164
-!P Do not attempt to infer ANSI or C++ prototypes from
167
The resulting C invokes the support routines of f77; object
168
code should be loaded by f77 or with ld(1) or cc(1) options
170
Page 3 (printed 5/12/96)
172
F2C(1) UNIX System V F2C(1)
174
-lF77 -lI77 -lm. Calling conventions are those of f77: see
185
/usr/lib/libF77.aintrinsic function library
187
/usr/lib/libI77.aFortran I/O library
189
/lib/libc.a C library, see section 3
192
S. I. Feldman and P. J. Weinberger, `A Portable Fortran 77
193
Compiler', UNIX Time Sharing System Programmer's Manual,
194
Tenth Edition, Volume 2, AT&T Bell Laboratories, 1990.
197
The diagnostics produced by f2c are intended to be self-
201
Floating-point constant expressions are simplified in the
202
floating-point arithmetic of the machine running f2c, so
203
they are typically accurate to at most 16 or 17 decimal
205
Untypable EXTERNAL functions are declared int.
207
Page 4 (printed 5/12/96)