From: "Joseph S. Myers" <joseph@codesourcery.com>
To: "Manuel López-Ibáñez" <lopezibanez@gmail.com>
Cc: Gcc Patch List <gcc-patches@gcc.gnu.org>,
Gerald Pfeifer <gerald@pfeifer.com>
Subject: Re: [PATCH doc] Explain options precedence and difference between -pedantic-errors and -Werror=pedantic
Date: Fri, 17 Oct 2014 20:53:00 -0000 [thread overview]
Message-ID: <Pine.LNX.4.64.1410172043260.14369@digraph.polyomino.org.uk> (raw)
In-Reply-To: <CAESRpQBi5c6KCnyB3iR7OR_xHxsoe0tie2d-bP3xjuX6y273dg@mail.gmail.com>
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On Fri, 17 Oct 2014, Manuel López-Ibáñez wrote:
> +Some options, such as @option{-Wall} and @option{-Wextra}, turn on other
> +options, such as @option{-Wunused}, which may turn on further options,
> +such as @option{-Wunused-value}. The combined effect of positive and
> +negative forms is that more specific options have priority over less
> +specific ones, independently of their position in the command-line. For
> +options of the same specificity, the last one takes effect. Options
> +enabled or disabled via pragmas (@pxref{Diagnostic Pragmas}) take effect
> +as if they appeared at the end of the command-line.
This part is OK.
> @@ -3318,8 +3327,8 @@
>
> @item -pedantic-errors
> @opindex pedantic-errors
> -Like @option{-Wpedantic}, except that errors are produced rather than
> -warnings.
> +This is equivalent to @option{-Werror=pedantic} plus making into errors
> +a few warnings that are not controlled by @option{-Wpedantic}.
But I think the previous version is better here. Maybe at present your
version is true, but in principle -Wpedantic can control warnings that
aren't pedwarns. Some of the -Wformat warnings are conditional on having
both -Wformat and -Wpedantic enabled - we can only represent those using
OPT_Wformat in the warning calls at present, but there's at least as case
for -Werror=pedantic to turn them into errors (while -pedantic-errors
definitely should not turn them into errors, as the code is only invalid
at runtime and is valid at compile time as long as it never gets
executed).
--
Joseph S. Myers
joseph@codesourcery.com
next prev parent reply other threads:[~2014-10-17 20:47 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-17 18:40 Manuel López-Ibáñez
2014-10-17 20:53 ` Joseph S. Myers [this message]
2014-10-17 23:43 ` Manuel López-Ibáñez
2014-10-18 0:04 ` Joseph S. Myers
2014-10-18 0:14 ` Manuel López-Ibáñez
2014-10-18 0:41 ` Joseph S. Myers
2014-10-18 17:03 ` Manuel López-Ibáñez
2014-10-19 16:14 ` Joseph S. Myers
2014-10-21 18:26 ` Manuel López-Ibáñez
2014-10-21 22:01 ` Joseph S. Myers
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