Re: additional GCC warning flags

FYI, I also use:

-Wpointer-arith -Wcast-align

locally. I think -Wcast-align throws errors on some platforms and can't
be use generally.

---------------------------------------------------------------------------

Neil Conway wrote:
> This patch adds code to "configure" to check if GCC supports the
> following warning flags: -Wdeclaration-after-statement (GCC 3.4+),
> -Wold-style-definition (GCC 3.4+), and -Wendif-labels (GCC 3.3+). Any of
> these options that are supported by $CC are added to $CFLAGS. The patch
> also removes -Wmissing-declarations from the default CFLAGS, on the
> grounds that it is (I believe) redundant when -Wmissing-prototypes is
> also specified.
>
> (I didn't mention -Wendif-labels in my mail to -hackers, but it should
> be pretty innocuous: "Warn whenever an #else or an #endif are followed
> by text.")
>
> This patch updates configure.in and configure (I re-ran autoconf 2.53).
> It doesn't introduce any additional warning messages locally (Linux, GCC
> 3.4), but might do so on some platforms (the code in src/port/ is likely
> to trigger some warnings, I think). Because of that, I think it is
> probably best to save this for 8.1
>
> -Neil
>

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