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Re: RFC: Named warnings
- From: Fergus Henderson <fjh at cs dot mu dot OZ dot AU>
- To: Segher Boessenkool <segher at koffie dot nl>
- Cc: Stan Shebs <shebs at apple dot com>, gcc at gcc dot gnu dot org
- Date: Sun, 26 Jan 2003 00:59:48 +1100
- Subject: Re: RFC: Named warnings
- References: <3E309188.1060508@apple.com> <3E3207D9.8D0DC96F@koffie.nl>
On 25-Jan-2003, Segher Boessenkool <segher@koffie.nl> wrote:
> A few ideas:
>
> Output the warning on the first line, and the description on the
> second line, like this:
>
> bla.c:14:3: warning: conversion-signed-unsigned
> bla.c:14:3: Implicit conversion from signed to unsigned
>
> Or, with the new flags -Wexplanation and -Wwhy:
>
> bla.c:6:1: warning: comment-multi-line
> bla.c:6:1: (-Wcomment-multi-line was enabled by -Wall)
> bla.c:6:1: ==================================================
> bla.c:6:1: Multi-line comment:
> bla.c:6:1:
> bla.c:6:1: A `//' comment line ends in a `\', which causes
> bla.c:6:1: the next line to be part of that comment as well.
> bla.c:6:1: This is probably not what you want.
> bla.c:6:1: ==================================================
The Mercury compiler uses an approach similar to this.
Most users seem to be happy with it. But a few
have requested that we provide a mode in which the file
name and line/column number is only printed once, at
the start of the error, rather than once per line:
bla.c:14:3: warning: conversion-signed-unsigned
Implicit conversion from signed to unsigned
bla.c:6:1: warning: comment-multi-line
(-Wcomment-multi-line was enabled by -Wall)
==================================================
Multi-line comment:
A `//' comment line ends in a `\', which causes
the next line to be part of that comment as well.
This is probably not what you want.
==================================================
This apparently works better in some environments (I forget which --
maybe Emacs?).
Another useful refinement is that if the compiler issues a warning
for which more information is available, it should set
a flag, and if at the end of compilation this flag is set,
it should output an additional final message:
Recompile with `-Wexplanation' for more information.
--
Fergus Henderson <fjh@cs.mu.oz.au> | "I have always known that the pursuit
The University of Melbourne | of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh> | -- the last words of T. S. Garp.