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Date: Thu, 17 May 2007 22:32:21 +0200
From: Christian Franke <Christian DOT Franke AT t-online DOT de>
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Subject: _GLIBCXX_USE_C99 not working?
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Defining _GLIBCXX_USE_C99 does not work with current Cygwin C++ includes.

Testcase:

#define _GLIBCXX_USE_C99 1 // need std::llabs()

#include <cstdlib>

long long f(long long x)
{
    return std::llabs(x);
}


Compile fails with:

/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


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++config.h
is not set.

But "using ::strtold" exists in the "#if _GLIBCXX_USE_C99" part of
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/cstdlib

Workaround: delete the two "using ::strtold" lines from cstdlib.

Christian


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