_GLIBCXX_USE_C99 not working?

Christian Franke Christian.Franke@t-online.de
Thu May 17 20:45:00 GMT 2007

Defining _GLIBCXX_USE_C99 does not work with current Cygwin C++ includes.


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

#include <cstdlib>

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

Compile fails with:

  error: `::strtold' has not been declared
  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
is not set.

But "using ::strtold" exists in the "#if _GLIBCXX_USE_C99" part of

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


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