[Bug libstdc++/51749] New: Including pollute global namespace

[nospam.kotarou.dono at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51749

             Bug #: 51749
           Summary: Including <algorithm> pollute global namespace
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: nospam.kotarou.d...@gmail.com


Created attachment 26235
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26235
Preprocessed file

Including the header file <algorithm> on Linux seems to pollute the global
namespace. I discovered this while attempting to put <sys/select.h> in a
namespace. A quick example is given below:

test.cpp:

#include <algorithm>
fd_set set; // Should not compile
int main() { return 0; }

Compiles with: g++ test.cpp -o test

gcc -v:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/home/kotarou3/usr/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../mingw/gcc-src/configure
--prefix=/home/kotarou3/work/gcc-build/../gcc
--with-gmp=/home/kotarou3/work/gcc-build/../mingw/gmp
--with-mpfr=/home/kotarou3/work/gcc-build/../mingw/mpfr
--with-mpc=/home/kotarou3/work/gcc-build/../mingw/mpc --enable-languages=c,c++
--disable-win32-registry --enable-checking=release --enable-shared
Thread model: posix
gcc version 4.7.0 20111231 (experimental) (GCC)