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Re: libpq: Newbie help w/ data type conversions on

From: Marvin Bellamy <marvin(dot)bellamy(at)innovision(dot)com>
Cc: pgsql-interfaces(at)postgresql(dot)org
Subject: Re: libpq: Newbie help w/ data type conversions on
Date: 2005-04-01 20:15:46
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Lists: pgsql-interfaces
jtv(at)xs4all(dot)nl wrote:

>Marvin Bellamy <marvin(dot)bellamy(at)innovision(dot)com> wrote:
>>I'm building for MSVC 7.1.3088, VS .NET 2003 on Win XP.  I copied the
>>compiler headers and pointed the common file attributes to my PostgreSQL
>>install and I get this error:
>>..\src\util.cxx(60) : warning C4244: 'initializing' : conversion from
>>'double' to 'const float', possible loss of data
>>..\src\util.cxx(60) : error C2124: divide or mod by zero
>Ah, that's a bit of workaround code for compilers that don't have proper
>ways of producing NANs.  The sample configuration headers for your
>compiler don't say yet whether those proper ways are available, so the
>code assumes the worst and reverts to divide-by-zero (strictly at compile
>time, mind you, so neither the warning or the error is really appropriate)
>to generate NaNs.
>Easiest fix: define the PQXX_HAVE_QUIET_NAN preprocessor macro.  If that
>doesn't work (i.e. if the compiler doesn't provide quiet_NaN()), define
>PQXX_HAVE_NAN instead.  I can release an update over the coming days that
>fixes this, once I'm sure about what works.

Defining the PQXX_HAVE_QUIET_NAN macro allowed the build to complete 
successfully.  Thanks!

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