Table of Contents
This setting controls certain
options about the form of the Fortran source code. The list consists
of keywords separated by commas or colons. There are three special keywords:
all to turn on all the options, none to turn them all off, and help
to print the list of all the keywords with a brief explanation of each.
If list is omitted, -source is equivalent to -source=all , and -nosource
is equivalent to -source=none .
For compatibility with previous versions
of ftnchek , a numeric form of this setting is also accepted: the list
is replaced by a number which is the sum of the numbers in parentheses
beside the keywords in the following list. The warning keywords with their
meanings are as follows:
- dec-tab (1):
- Accept DEC-style tab-formatted source.
A line beginning with an initial tab will be treated as a new statement
line unless the character after the tab is a nonzero digit, in which case
it is treated as a continuation line. The next column after the tab or
continuation mark is taken as column 7. A warning will be given in the
case where the line is a continuation, if -f77=dec-tab is in effect.
- Accept VMS-style INCLUDE statements. These follow the normal syntax,
but with the following additional features: (1) the file extension, if
not given, defaults to the same as a normal source file extension; and (2)
the option /LIST or /NOLIST can be appended to the include-file name,
to control listing of its contents.
- unix-backslash (4):
- Handle UNIX-style
backslash escapes in character strings. The escape sequence following the
backslash will be evaluated according to the ANSI standard for strings
in C: up to three digits signify an octal value, an x signifies the start
of a hexadecimal constant, any of the letters a b f n r t signify special
control codes, and any other character (including newline) signifies the
character itself. When this source code option is in effect, a warning
will be given if the -f77=backslash setting is specified.
behavior is to treat the backslash like any other normal character, but
a warning about portability will be generated if the -portability flag
is set. Because of the fact that some compilers treat the backslash in
a nonstandard way, it is possible for standard-conforming programs to be
non-portable if they use the backslash character in strings.
does not do much with the interpreted string, it is seldom necessary
to use this option. It is needed in order to avoid spurious warnings only
if (a) the program being checked uses backslash to embed an apostrophe
or quote mark in a string instead of using the standard mechanism of doubling
the delimiter; (b) the backslash is used to escape the end-of-line in order
to continue a string across multiple source lines; or (c) a PARAMETER
definition uses an intrinsic string function such as LEN with such a
string as argument, and that value is later used to define array dimensions,
- parameter-implicit-type (8):
- Implicit typing of a parameter by the
data type of the value assigned. Some non-standard compilers may allow the
data type of the value to override the Fortran 77 default type of a parameter
that is based on the first letter of the parameter name. This option only
applies to PARAMETER statements of the standard form which has parentheses.
A parameter that has been explicitly declared in a type statement prior
to the PARAMETER statement is not affected by this option. A warning
will be given under the -f77=param-implicit-type or -portability=param-implicit-type
Note that this implicit typing is treated as equivalent to an
explicit type declaration for the parameter. Therefore, if you use -makedcls=undeclared-only
to generate declarations only of undeclared variables, these parameters
will not be included.
- dec-parameter-standard-type (16):
- Follow the Fortran
77 rule for data typing of DEC Fortran style parameters. These are declared
using a nonstandard form of the PARAMETER statement which lacks parentheses.
According to DEC Fortran, parameters defined by this form of the statement
have their data type given by the data type of the value assigned. Use
this option to tell ftnchek not to follow this rule but instead to use
the same rule as for standard PARAMETER statements. This option does
not apply to PARAMETER statements of the standard form.
By default, all
these source code options are turned off, except for the vms-include option,
which is on by default in the VMS version..
See also: -f77 , -include , -portability