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invoke.texi (Warning Options): Add an explanation of why you might want the -Wfloat-equal flag.

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* invoke.texi (Warning Options): Add an explanation of why
you might want the -Wfloat-equal flag.

From-SVN: r32061
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Geoff Keating 2000-02-19 01:37:31 +00:00 committed by Geoffrey Keating
parent c8d8ed65a5
commit 488d3985f2
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@ -1,3 +1,8 @@
2000-02-18 Geoff Keating <geoffk@cygnus.com>
* invoke.texi (Warning Options): Add an explanation of why
you might want the -Wfloat-equal flag.
Fri Feb 18 20:08:57 2000 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* bitmap.c (bitmap_operation): Avoid using -1 for index since unsigned.

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gcc/invoke.texi
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@ -1724,6 +1724,17 @@ struct s x = @{ 3, 4 @};
@item -Wfloat-equal
Warn if floating point values are used in equality comparisons.
The idea behind this is that sometimes it is convenient (for the
programmer) to consider floating-point values as approximations to
infinitely precise real numbers. If you are doing this, then you need
to compute (by analysing the code, or in some other way) the maximum or
likely maximum error that the computation introduces, and allow for it
when performing comparisons (and when producing output, but that's a
different problem). In particular, instead of testing for equality, you
would check to see whether the two values have ranges that overlap; and
this is done with the relational operators, so equality comparisons are
probably mistaken.
@item -Wtraditional (C only)
Warn about certain constructs that behave differently in traditional and
ANSI C.