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Added a more detailed explanation of the --standard command line switch.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@4656 b7a2c559-68d2-44c3-8de9-860c34a00d81
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uz 2010-05-01 16:22:54 +00:00
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doc/cc65.sgml
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@ -283,15 +283,29 @@ Here is a description of all the command line options:
This option allows to set the language standard supported. The argument is
one of
<itemize>
<item>c89
<item>c99
<item>cc65
</itemize>
<descrip>
<tag/c89/
This disables anything that is illegal in C89/C90. Among those things
are <tt>//</tt> comments and the non-standard keywords without
underscores. Please note that cc65 is not a fully C89 compliant compiler
despite this option. A few more things (like floats) are missing.
Please note that the compiler does not support the c99 standard and never
will. c99 mode is actually c89 mode with a few selected c99 extensions
(// comments for example).
<tag/c99/
This enables a few features from the C99 standard. With this option,
<tt>//</tt> comments are allowed. It will also cause warnings and even
errors in a few situations that are allowed with <tt/--standard c89/.
For example, a call to a function without a prototype is an error in
this mode.
<tag/cc65/
This is the default mode. It is like c99 mode, but additional features
are enabled. Among these are "void data", non-standard keywords without
the underlines, unnamed function parameters and the requirement for
main() to return an int.
</descrip>
Please note that the compiler does not support the C99 standard and never
will. c99 mode is actually c89 mode with a few selected C99 extensions.
<label id="option-standard">