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Removing -Wunsuffixed-float-constants, -Wdouble-promotion, -Wformat-zero

From: Paul Eggert
Subject: Removing -Wunsuffixed-float-constants, -Wdouble-promotion, -Wformat-zero-length
Date: Tue, 29 Nov 2011 13:05:29 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111115 Thunderbird/8.0

On 11/29/11 09:35, Jim Meyering wrote:
> +  gl_WARN_ADD([-Wno-unsuffixed-float-constants])

How about if we remove -Wunsuffixed-float-constants from
manywarnings.m4?  In practice it typically causes more
trouble than it cures (the above-quoted gzip patch is
one example, but I've run into it elsewhere).

While we're on the subject of manywarnings.m4, can we also
remove -Wdouble-promotion and -Wformat-zero-length?  They
also seem to be more suited for special- rather than
general-purpose code.

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