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g77.texi: Additions about `/*', trailing comments and cpp.

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1998-09-23  Dave Love  <d.love@dl.ac.uk>
        * g77.texi: Additions about `/*', trailing comments and cpp.

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Dave Love 1998-09-24 08:40:26 +00:00 committed by Dave Love
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2 changed files with 18 additions and 1 deletions
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@ -1,3 +1,7 @@
1998-09-23 Dave Love <d.love@dl.ac.uk>
* g77.texi: Additions about `/*', trailing comments and cpp.
1998-09-18 Dave Love <d.love@dl.ac.uk> 1998-09-18 Dave Love <d.love@dl.ac.uk>
* g77.texi: Various additions and some small fixes. * g77.texi: Various additions and some small fixes.

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gcc/f/g77.texi
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@ -1539,7 +1539,7 @@ line being effectively commented out---unfortunate if that
line is a non-comment line of important code! line is a non-comment line of important code!
@emph{Note:} The @samp{-traditional} and @samp{-undef} flags are supplied @emph{Note:} The @samp{-traditional} and @samp{-undef} flags are supplied
to @code{cpp} by default, to avoid unpleasant surprises. to @code{cpp} by default, to help avoid unpleasant surprises.
@xref{Preprocessor Options,,Options Controlling the Preprocessor, @xref{Preprocessor Options,,Options Controlling the Preprocessor,
gcc,Using and Porting GNU CC}. gcc,Using and Porting GNU CC}.
This means that ANSI C preprocessor features (such as the @samp{#} This means that ANSI C preprocessor features (such as the @samp{#}
@ -1550,6 +1550,15 @@ Thus, if you want to do system-specific
tests, use, for example, @samp{#ifdef __linux__} rather than @samp{#ifdef linux}. tests, use, for example, @samp{#ifdef __linux__} rather than @samp{#ifdef linux}.
Use the @samp{-v} option to see exactly how the preprocessor is invoked. Use the @samp{-v} option to see exactly how the preprocessor is invoked.
@cindex /*
Unfortunately, the @samp{-traditional} flag will not avoid an error from
anything that @code{cpp} sees as an unterminated C comment, such as:
@smallexample
C Some Fortran compilers accept /* as starting
C an inline comment.
@end smallexample
@xref{Trailing Comment}.
The following options that affect overall processing are recognized The following options that affect overall processing are recognized
by the @code{g77} and @code{gcc} commands in a GNU Fortran installation: by the @code{g77} and @code{gcc} commands in a GNU Fortran installation:
@ -6868,6 +6877,9 @@ continuation line, imitating the behavior of @code{f2c}.
@node Trailing Comment @node Trailing Comment
@section Trailing Comment @section Trailing Comment
@cindex trailing comment
@cindex comment, trailing
@cindex /*
@code{g77} supports use of @samp{/*} to start a trailing @code{g77} supports use of @samp{/*} to start a trailing
comment. comment.
In the GNU Fortran language, @samp{!} is used for this purpose. In the GNU Fortran language, @samp{!} is used for this purpose.
@ -6887,6 +6899,7 @@ error (though it would likely behave incorrectly).
@node Debug Line @node Debug Line
@section Debug Line @section Debug Line
@cindex debug line @cindex debug line
@cindex comment line, debug
Use of @samp{D} or @samp{d} as the first character (column 1) of Use of @samp{D} or @samp{d} as the first character (column 1) of
a source line denotes a debug line. a source line denotes a debug line.