1
2     F2C(1)		       UNIX System V			F2C(1)
3
4     NAME
5	  f2c -	Convert	Fortran	77 to C	or C++
6
7     SYNOPSIS
8	  f2c [	option ... ] file ...
9
10     DESCRIPTION
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.
18
19	  The following	options	have the same meaning as in f77(1).
20
21	  -C   Compile code to check that subscripts are within
22	       declared	array bounds.
23
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
28	       as long int.
29
30	  -Idir
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
36	       .
37
38	  -onetrip
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.)
42
43	  -U   Honor the case of variable and external names.  Fortran
44	       keywords	must be	in lower case.
45
46	  -u   Make the	default	type of	a variable `undefined' rather
47	       than using the default Fortran rules.
48
49	  -w   Suppress	all warning messages, or, if the option	is
50	       `-w66', just Fortran 66 compatibility warnings.
51
52	  The following	options	are peculiar to	f2c.
53
54	  -A   Produce ANSI C.	Default	is old-style C.
55
56     Page 1					     (printed 5/12/96)
57
58     F2C(1)		       UNIX System V			F2C(1)
59
60	  -a   Make local variables automatic rather than static
61	       unless they appear in a DATA, EQUIVALENCE, NAMELIST, or
62	       SAVE statement.
63
64	  -C++ Output C++ code.
65
66	  -c   Include original	Fortran	source as comments.
67
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.
71
72	  -ddir
73	       Write `.c' files	in directory dir instead of the	cur-
74	       rent directory.
75
76	  -E   Declare uninitialized COMMON to be Extern (overridably
77	       defined in f2c.h	as extern).
78
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.
83
84	  -ext Complain	about f77(1) extensions.
85
86	  -f   Assume free-format input: accept	text after column 72
87	       and do not pad fixed-format lines shorter than 72 char-
88	       acters with blanks.
89
90	  -72  Treat text appearing after column 72 as an error.
91
92	  -g   Include original	Fortran	line numbers in	#line lines.
93
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.
97
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.
102
103	  -i90 Do not recognize	the Fortran 90 bit-manipulation
104	       intrinsics btest, iand, ibclr, ibits, ibset, ieor, ior,
105	       ishft, and ishftc.
106
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-
111	       precision operands.
112
113     Page 2					     (printed 5/12/96)
114
115     F2C(1)		       UNIX System V			F2C(1)
116
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.
123
124	  -p   Supply preprocessor definitions to make common-block
125	       members look like local variables.
126
127	  -R   Do not promote REAL functions and operations to DOUBLE
128	       PRECISION.  Option `-!R'	confirms the default, which
129	       imitates	f77.
130
131	  -r   Cast values of REAL functions (including	intrinsics) to
132	       REAL.
133
134	  -r8  Promote REAL to DOUBLE PRECISION, COMPLEX to DOUBLE
135	       COMPLEX.
136
137	  -s   Preserve	multidimensional subscripts.  Suppressed by
138	       option `-C' .
139
140	  -Tdir
141	       Put temporary files in directory	dir.
142
143	  -w8  Suppress	warnings when COMMON or	EQUIVALENCE forces
144	       odd-word	alignment of doubles.
145
146	  -Wn  Assume n	characters/word	(default 4) when initializing
147	       numeric variables with character	data.
148
149	  -z   Do not implicitly recognize DOUBLE COMPLEX.
150
151	  -!bs Do not recognize	backslash escapes (\", \', \0, \\, \b,
152	       \f, \n, \r, \t, \v) in character	strings.
153
154	  -!c  Inhibit C output, but produce -P	output.
155
156	  -!I  Reject include statements.
157
158	  -!i8 Disallow	INTEGER*8.
159
160	  -!it Don't infer types of untyped EXTERNAL procedures	from
161	       use as parameters to previously defined or prototyped
162	       procedures.
163
164	  -!P  Do not attempt to infer ANSI or C++ prototypes from
165	       usage.
166
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
169
170     Page 3					     (printed 5/12/96)
171
172     F2C(1)		       UNIX System V			F2C(1)
173
174	  -lF77	-lI77 -lm.  Calling conventions	are those of f77: see
175	  the reference	below.
176
177     FILES
178	  file.[fF]	   input file
179
180	  *.c		   output file
181
182	  /usr/include/f2c.h
183			   header file
184
185	  /usr/lib/libF77.aintrinsic function library
186
187	  /usr/lib/libI77.aFortran I/O library
188
189	  /lib/libc.a	   C library, see section 3
190
191     SEE ALSO
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.
195
196     DIAGNOSTICS
197	  The diagnostics produced by f2c are intended to be self-
198	  explanatory.
199
200     BUGS
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
204	  places.
205	  Untypable EXTERNAL functions are declared int.
206
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