Using g++ 15.1 and gtk3 (or also gtkmm with the needed changes) with this code
#include <gtk/gtk.h>
#include <iostream>
int main() {
std:: cout<< "bonjour" << std::endl;
}
All is well. But if I make this change;
#include <gtk/gtk.h>
import std;
int main() {
std:: cout<< "bonjour" << std::endl;
}
I get the error message:
error: conflicting language linkage for imported declaration 'constexpr bool std::__is_constant_evaluated()'
__is_constant_evaluated() _GLIBCXX_NOEXCEPT
How can I fix this ?
I was using Ubuntu 20.04 with g++ updated to g++15.1 (compiled from source)
I changed to Ubuntu 25.04 and g++15.0 (from ubuntu's ppa)
I checked a c++config.h file where _GLIBCXX_HAVE_IS_CONSTANT_EVALUATED is defined now there are test for more recent version of c++ which seem to modify it depending on latest version of c++.
So basically, everything must be very recent to work.