[Boost-users] Boost regex is breaking math.h's signbit

Subject: [Boost-users] Boost regex is breaking math.h's signbit
From: Adrian (boost_at_[hidden])
Date: 2010-06-18 11:14:04

Hi All,

 

If I include boost/regex.hpp - the builtin c signbit stops being available.
I am using my version of gcc 4.5.0 and my version of boost (built and
installed with defaults)

 

I've removed distro's install of boost and gcc. 

 

I am new to this list so apologies if I've missed any need information. 

 

TIA

Adrian 

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adrianc_at_dluadrianc:~> cat signbit.cc

#include <iostream>

#include <math.h>

#include <boost/version.hpp>

#ifdef WITH_BOOST_REGEX_ADRIAN

#include <boost/regex.hpp>

#endif

 

int main(int argc, char *argv[])

{

   float a=12.4234;

   float b=-123.4333;

 

#ifdef _XOPEN_SOURCE

   std::cout << "_XOPEN_SOURCE=" << _XOPEN_SOURCE << std::endl;

#endif

 

#ifdef _ISOC99_SOURCE

   std::cout << "_ISOC99_SOURCE is here\n";

#endif

 

   std::cout << "Boost version=" << BOOST_LIB_VERSION << std::endl;

   std::cout << "Boost version=" << BOOST_VERSION << std::endl;

 

#ifdef WITH_SIGNBIT_ADRIAN

   std::cout << "signbit a=" << signbit(a) << std::endl;

   std::cout << "signbit b=" << signbit(b) << std::endl;

#endif

 

   return 0;

}

 

 

adrianc_at_dluadrianc:~> g++ -DWITH_SIGNBIT_ADRIAN signbit.cc

adrianc_at_dluadrianc:~> a.out

_XOPEN_SOURCE=700

_ISOC99_SOURCE is here

Boost version=1_43

Boost version=104300

signbit a=0

signbit b=-2147483648

adrianc_at_dluadrianc:~> g++ -DWITH_SIGNBIT_ADRIAN -DWITH_BOOST_REGEX_ADRIAN
signbit.cc

signbit.cc: In function 'int main(int, char**)':

signbit.cc:25:42: error: 'signbit' was not declared in this scope

adrianc_at_dluadrianc:~>

 

:~> which gcc

/usr/local/bin/gcc

:~> gcc -v

Using built-in specs.

COLLECT_GCC=gcc

COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/i686-pc-linux-gnu/4.5.0/lto-wrapp
er

Target: i686-pc-linux-gnu

Configured with: ../gcc-4.5.0/configure --enable-__cxa_atexit
--enable-languages=c,c++ --enable-threads --with-cpu=core2 --disable-nls
--with-arch=i686 --with-mpfr=/usr/local --with-gmp=/usr/local
--with-mpc=/usr/local --with-build-time-tools=/usr/local --enable-lto

Thread model: posix

gcc version 4.5.0 (GCC)