On 03/28/18 20:30, Christian Henning via Boost wrote:
Hi all,
we are, at the boost::gil corner, investigating a runtime failure when compiling with gcc 5.4. When running in release configuration the following code fails:
#include <iostream> #include
using namespace boost::gil; using namespace std;
void error_if(bool condition) { if (condition) throw std::exception(); }
bits32s c32s_min = channel_traits<bits32s>::min_value(); bits32s c32s_max = channel_traits<bits32s>::max_value();
// For channel values simply initialize the value directly template <typename ChannelValue> struct value_core { typedef ChannelValue channel_t; channel_t _min_v, _max_v;
value_core() : _min_v(channel_traits<ChannelValue>::min_value()), _max_v(channel_traits<ChannelValue>::max_value()) {} };
int main(int argc, char *argv[]) { value_core<bits32s> a;
bits32s v_min, v_max;
v_min = channel_convert<bits32s>(c32s_min); v_max = channel_convert<bits32s>(c32s_max);
//std::cout << v_min << std::endl; // std::cout << this->_min_v << std::endl; //std::cout << v_max << std::endl; // std::cout << this->_max_v << std::endl;
error_if(v_min != a._min_v || v_max != a._max_v); }
The interesting thing is that everything works with the cout's enabled.
Has anyone ever dealt with a similar issue?
Most likely, you have a signed integer overflow somewhere. The code crashes on gcc 7.2 with -O3 but doesn't crash with -O0 or with -O3 -fwrapv.