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Date: Fri, 18 May 2007 10:50:29 +0200
From: =?ISO-8859-1?Q?V=E1clav_Haisman?= <v DOT haisman AT sh DOT cvut DOT cz>
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To: cygwin AT cygwin DOT com
Subject: Re: _GLIBCXX_USE_C99 not working?
References: <464CBBD5 DOT 4040709 AT t-online DOT de>
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Christian Franke wrote:
> Defining _GLIBCXX_USE_C99 does not work with current Cygwin C++ includes.
>=20
> Testcase:
>=20
> #define _GLIBCXX_USE_C99 1 // need std::llabs()
>=20
> #include <cstdlib>
>=20
> long long f(long long x)
> {
>    return std::llabs(x);
> }
>=20
>=20
> Compile fails with:
>=20
> /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/cstdlib:181:
>  error: `::strtold' has not been declared
> /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/cstdlib:200:
>  error: `__gnu_cxx::strtold' has not been declared
>=20
>=20
> The function strtold() does actually not exist in stdlib.h
> and the corresponding _GLIBCXX_HAVE_STRTOLD in
> /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/i686-pc-cygwin/bits/c++conf=
ig.h
>=20
> is not set.
>=20
> But "using ::strtold" exists in the "#if _GLIBCXX_USE_C99" part of
> /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/cstdlib
>=20
> Workaround: delete the two "using ::strtold" lines from cstdlib.
>=20
> Christian
Look into the cstdlib header. You will find that llabs(long long) and
abs(long long) are in the __gnu_cxx namespace there. It is because long
long is not C++ standard type.

--
Vaclav Haisman


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