Hi Marshall, 1. are you using the g++ or gcc ? 2. which version are you using ? I got the code from another group which is on older version of g++ (perhaps 4.3.x) and they don't get warning too. we tried 4.4.5 and 4.6 of g++ with same results. my cmd line is below again - not sure what else could be different. g++ -ftemplate-depth-128 -O0 -fno-inline -Wall -g -Wconversion -Wno-strict-aliasing -Wextra -Wnon-virtual-dtor -Wno-missing-field-initializers -Wno-array-bounds -Wno-ignored-qualifiers -Wno-parentheses -Wno-strict-aliasing -fPIC -DBOOST_ALL_NO_LIB -I<path to boost_1_44_0>/include -Iinclude -c -o boost_regex_test.o boost_regex_test.cpp Vicente, sorry for misspelling your name in the last email. thanks ________________________________ From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Marshall Clow Sent: Thursday, December 08, 2011 7:04 PM To: boost-users@lists.boost.org Subject: Re: [Boost-users] [boost] compilation warnings questions by a newbee On Dec 8, 2011, at 3:38 PM, Rai, Neeraj wrote: Hi Vincent, You are right - the -Wconversion causes it to warn on that line. Is there any way to fix it ? 2 reasons : a) we are not allowed to have warnings in our code b) I am going to miss the real warnings about conversion if I let this pass. I just tried 1.48.0 with g++ 4.4.5 and 4.6 and same results. Without -Wconversion it is clean, but that is not an option for me. I just tried again with -Wconversion (and boost 1.48). No warnings. Not sure what is PO ? I think he meant "OP" - original poster. From: boost-users-bounces@lists.boost.org<mailto:boost-users-bounces@lists.boost.org> [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Vicente J. Botet Escriba Sent: Thursday, December 08, 2011 6:24 PM To: boost-users@lists.boost.org<mailto:boost-users@lists.boost.org> Subject: Re: [Boost-users] [boost] compilation warnings questions by a newbee Le 09/12/11 00:11, Marshall Clow a écrit : On Dec 8, 2011, at 2:58 PM, Rai, Neeraj wrote: Hi, I am writing my first boost program and having trouble with the compiler warning against boost 1.44.0. Is there any way to get rid of those warnings so I can focus on real warnings in my code ? The gist of warning is : boost_1_44_0/include/boost/mpl/aux_/integral_wrapper.hpp:73:96: warning: the result of the conversion is unspecified because '-0x00000000000000001' is outside the range of type 'boost::numeric::udt_builtin_mixture_enum' [-Wconversion] Any help or pointers are appreciated. Neeraj ====== The following program is a cut down version of my code, just declares sregex #include <iostream> #include <boost/xpressive/xpressive.hpp> int main (int _argc, const char** _argv) { std::cout << "argc=" << _argc << " argv=" << _argv << std::endl; using namespace boost::xpressive; std::string keyword(""); sregex const re(sregex::compile(keyword, sregex::icase)); } Just tried this with both gcc 4.2.1 and clang 3.0 using the current Boost (1.48), and it worked fine. No warnings, even with -Wall The PO is using -Wconversion Best, Vicente -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki