I think on Linux pthread is used to implement std::thread so you need to specify the -pthread compiler option. As this is a linking option, this compiler option need to be AFTER the source files: $ g++ -std=c++0x test.cpp -pthread
Most of the answers suggest alternative solutions, such as different compilers or external libraries, which would most likely bring a lot of rewriting or integration work. I will try to stick to what the question is asking, and focus on what can be done with GCC alone, by activating compiler flags or doing minimal changes … Read more
Edit summary My original answer merely noted that the code contained a lot of replicated computations and that many of the powers involved factors of 1/3. For example, pow(x, 0.1e1/0.3e1) is the same as cbrt(x). My second edit was just wrong, and and my third extrapolated on this wrongness. This is what makes people afraid … Read more
If your version of g++ is later than 4.7 I think you can find the default version of C++ standard supported like so: g++ -dM -E -x c++ /dev/null | grep -F __cplusplus An example from my machine: mburr@mint17 ~ $ g++ –version | head -1 g++ (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4 mburr@mint17 ~ $ g++ -dM … Read more
The answer was provided by a kind member of SO C++ chat. It looks like this behaviour is caused by a bug in gcc. The workaround provided in the last comment of that bug discussion does work and solves the issue: -Wl,–no-as-needed
Seeing from your G++ version, you need to update it badly. C++11 has only been available since G++ 4.3. The most recent version is 4.7. In versions pre-G++ 4.7, you’ll have to use -std=c++0x, for more recent versions you can use -std=c++11.
First, the purposes of these functions are described in the Itanium C++ ABI; see definitions under “base object destructor”, “complete object destructor”, and “deleting destructor”. The mapping to mangled names is given in 5.1.4. Basically: D2 is the “base object destructor”. It destroys the object itself, as well as data members and non-virtual base classes. … Read more
What is the difference between the two, The g++ is a compiler driver. It knows how to invoke the actual compiler (cc1plus), assembler and linker. It does not know how to parse or compile the sources. and should I ever call cc1plus directly? No.
It means that you have a memory error. You may be trying to free a pointer that wasn’t allocated by malloc (or delete an object that wasn’t created by new) or you may be trying to free/delete such an object more than once. You may be overflowing a buffer or otherwise writing to memory to … Read more
Instead of nm, you can use the powerful objdump. See the man page for details. Try objdump -t myfile or objdump -T myfile. With the -C flag you can also demangle C++ names, like nm does.