Bug 479409

Created attachment 328539 [details]
patch to remove unused iostreams include

Description of problem:
boost_1_37_0/boost/spirit/home/classic/iterator/multi_pass.hpp includes iostream.h but doesn't seem to require it

Version-Release number of selected component (if applicable):
boost-1.37.0-2.fc11

The problem is that anything that includes that header will then end up including iostream.h which has a global object in it to force the iostream/stdio locking methods in the .o file, i.e. 

std::ios_base::Init::Init()
and
std::ios_base::Init::~Init()

and calling them in the global .so ctors and dtors which is unnecessary if iostreams aren't actually used is a titchy startup-time de-optimization

to reproduce

before:
> echo "#include <boost/spirit/home/classic/iterator/multi_pass.hpp>" | g++ -c -x c++ - -o test.o
> nm test.o 
000000000000003d t _GLOBAL__I_
0000000000000000 t _Z41__static_initialization_and_destruction_0ii
                 U _ZNSt8ios_base4InitC1Ev
                 U _ZNSt8ios_base4InitD1Ev
0000000000000000 b _ZStL8__ioinit
                 U __cxa_atexit
                 U __dso_handle
                 U __gxx_personality_v0

after:
> echo "#include <boost/spirit/home/classic/iterator/multi_pass.hpp>" | g++ -c -x c++ - -o test.o
> nm test.o 
<nothing>