struct details_state { struct details_status D1; struct details_status D2; }; struct details { struct details_state details_states[2]; } __attribute__((packed)); struct details *p; voi...

I can compile and run a program that assigns a long int literal, albeit it one that would fit into an int, to an int variable. $ cat assign-long-to-int.c #include <stdio.h> int main(void){ ...

This program (compiled with option -std=c++17) #include <stdio.h> #include <string> void* operator new(std::size_t nrOfBytes) { printf("allocate %zd bytes on heap\n", nrOfBytes); voi...

I'm trying to multiply vectors of uint32_t producing the full 64-bit result in an uint64_t vector in gcc. The result I expect is for gcc to emit a single VPMULUDQ instruction. But what gcc outputs ...

I'm trying to format the modification time of a file as a string (UTC). The following code compiles with GCC 8, but not GCC 9. #include <chrono> #include <filesystem> #include <ioma...

I'm simply trying stringstream in UTF-8: #include<iostream> #include<string> #include<sstream> int main() { std::basic_stringstream<char8_t> ss(u8"hello"); char8_t c; st...