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<HTML>
<HEAD>
<TITLE>Option: source</TITLE>
</HEAD>
<BODY>
<A HREF="toc.html">Table of Contents</A><P>
<P>Previous: <A HREF="sort.html">-sort</A><HR><P>
<H2>Option: <font color=#FF0080>source</font></H2><P>
<A NAME="source"></A><DT><B><A HREF="source.html">-source</A>=</B><I>list</I> </DT>
<DD>This setting controls certain options about
the form of the Fortran source code. The <I>list </I> consists of keywords separated
by commas or colons. There are three special keywords: <B>all </B> to turn on
all the options, <B>none </B> to turn them all off, and <B>help </B> to print the list
of all the keywords with a brief explanation of each. If <I>list </I> is omitted,
<B><A HREF="source.html">-source</A> </B> is equivalent to <B><A HREF="source.html">-source</A>=all </B>, and <B>-nosource </B> is equivalent to <B><A HREF="source.html">-source</A>=none
</B>. <blockquote></DD>
</DL>
<P>
For compatibility with previous versions of <B>ftnchek </B>, a numeric form
of this setting is also accepted: the <I>list </I> 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:
<DL>
<DT><B>dec-tab </B>
(1): </DT>
<DD>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 <B><A HREF="f77.html">-f77</A>=dec-tab </B> is in effect. </DD>
<DT><B>vms-include </B> (2): </DT>
<DD>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.
</DD>
<DT><B>unix-backslash </B> (4): </DT>
<DD>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 <B><A HREF="f77.html">-f77</A>=backslash </B> setting
is specified. <blockquote></DD>
</DL>
<P>
The default behavior is to treat the backslash like any
other normal character, but a warning about portability will be generated
if the <B><A HREF="portability.html">-portability</A> </B> 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.
<P>
Since <B>ftnchek </B> 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, etc. </blockquote>
<DL>
<DT><B>parameter-implicit-type </B> (8): </DT>
<DD>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 <B><A HREF="f77.html">-f77</A>=param-implicit-type
</B> or <B><A HREF="portability.html">-portability</A>=param-implicit-type </B> option. <blockquote></DD>
</DL>
<P>
Note that this implicit typing
is treated as equivalent to an explicit type declaration for the parameter.
Therefore, if you use <B><A HREF="makedcls.html">-makedcls</A>=undeclared-only </B> to generate declarations
only of undeclared variables, these parameters will <I>not </I> be included.
</blockquote>
<DL>
<DT><B>dec-parameter-standard-type (16): </B></DT>
<DD>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 <B>ftnchek </B> 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. </DD>
</DL>
</blockquote>
<P>
By default, all these source code options
are turned off, except for the <B>vms-include </B> option, which is on by default
in the VMS version.. <P>
See also: <B><A HREF="f77.html">-f77</A> </B>, <B><A HREF="include.html">-include</A> </B>, <B><A HREF="portability.html">-portability</A> </B>. </blockquote>
<P>
<DL>
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