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
13 current directory, with `.c' substituted for the final `.f'
14 or `.F'. If no Fortran files are named, f2c reads Fortran
15 from standard input and writes C on standard output. File
16 names that end with `.p' or `.P' are taken to be prototype
17 files, 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 Compile DO loops that are performed at least once if
32 reached. (Fortran 77 DO loops are not performed at all
33 if the upper limit is smaller than the lower limit.)
35 -U Honor the case of variable and external names. Fortran
36 keywords must be in lower case.
38 -u Make the default type of a variable `undefined' rather
39 than using the default Fortran rules.
41 -w Suppress all warning messages. If the option is
42 `-w66', only Fortran 66 compatibility warnings are
45 The following options are peculiar to f2c.
47 -A Produce ANSI C. Default is old-style C.
49 -a Make local variables automatic rather than static
50 unless they appear in a DATA, EQUIVALENCE, NAMELIST, or
55 -c Include original Fortran source as comments.
57 Page 1 Tenth Edition (printed 4/25/91)
61 -E Declare uninitialized COMMON to be Extern (overridably
62 defined in f2c.h as extern).
64 -ec Place uninitialized COMMON blocks in separate files:
65 COMMON /ABC/ appears in file abc_com.c. Option `-e1c'
66 bundles the separate files into the output file, with
67 comments that give an unbundling sed(1) script.
69 -ext Complain about f77(1) extensions.
71 -g Include original Fortran line numbers as comments.
73 -h Try to align character strings on word (or, if the
74 option is `-hd', on double-word) boundaries.
76 -i2 Similar to -I2, but assume a modified libF77 and libI77
77 (compiled with -Df2c_i2), so INTEGER and LOGICAL vari-
78 ables may be assigned by INQUIRE and array lengths are
81 -kr Use temporary values to enforce Fortran expression
82 evaluation where K&R (first edition) parenthesization
83 rules allow rearrangement. If the option is `-krd',
84 use double precision temporaries even for single-
87 -P Write a file.P of ANSI (or C++) prototypes for pro-
88 cedures defined in each input file.f or file.F. When
89 reading Fortran from standard input, write prototypes
90 at the beginning of standard output. Implies -A unless
91 option `-C++' is present. Option -Ps implies -P , and
92 gives exit status 4 if rerunning f2c may change proto-
93 types or declarations.
95 -p Supply preprocessor definitions to make common-block
96 members look like local variables.
98 -R Do not promote REAL functions and operations to DOUBLE
99 PRECISION. Option `-!R' confirms the default, which
102 -r Cast values of REAL functions (including intrinsics) to
105 -r8 Promote REAL to DOUBLE PRECISION, COMPLEX to DOUBLE
109 Put temporary files in directory dir.
111 -w8 Suppress warnings when COMMON or EQUIVALENCE forces
112 odd-word alignment of doubles.
114 Page 2 Tenth Edition (printed 4/25/91)
118 -Wn Assume n characters/word (default 4) when initializing
119 numeric variables with character data.
121 -z Do not implicitly recognize DOUBLE COMPLEX.
123 -!bs Do not recognize backslash escapes (\", \', \0, \\, \b,
124 \f, \n, \r, \t, \v) in character strings.
126 -!c Inhibit C output, but produce -P output.
128 -!I Reject include statements.
130 -!it Don't infer types of untyped EXTERNAL procedures from
131 use as parameters to previously defined or prototyped
134 -!P Do not attempt to infer ANSI or C++ prototypes from
137 The resulting C invokes the support routines of f77; object
138 code should be loaded by f77 or with ld(1) or cc(1) options
139 -lF77 -lI77 -lm. Calling conventions are those of f77: see
152 intrinsic function library
158 C library, see section 3
161 S. I. Feldman and P. J. Weinberger, `A Portable Fortran 77
162 Compiler', UNIX Time Sharing System Programmer's Manual,
163 Tenth Edition, Volume 2, AT&T Bell Laboratories, 1990.
166 The diagnostics produced by f2c are intended to be self-
171 Page 3 Tenth Edition (printed 4/25/91)
175 Floating-point constant expressions are simplified in the
176 floating-point arithmetic of the machine running f2c, so
177 they are typically accurate to at most 16 or 17 decimal
179 Untypable EXTERNAL functions are declared int.
181 Page 4 Tenth Edition (printed 4/25/91)