Background I was writing code that uses functions from ctype.h to identify things in strings. I accidentally passed the string (char*) to the function(s) which take and int type, causing the program to segfault. It was easy enough to see…
Description I created a sample to study the TLB access/misses statistics. Sample writes 1 to every 4096-th element of the array. Array has 10'000 * 4096 bytes. I expect to see 10'000 TLB stores only, but generated assembly loads beginning…
I have a large program that's generating object files that are much larger than I expect. My suspicion is that somewhere in the program, someone is using inefficient template metaprogramming that's generating O(n**2) template types. Is there a command-line tool…
When I'm writing C codes on VS Code, IntelliSense can't detect functions declared in standard libraries, while the project compile properly. Details: The flockfile function is declared as void flockfile (FILE *__stream) in stdio.h, however IntelliSense treats the function wrongly.…
I declare a struct in a header file. I use this struct in two compilation units. One is compiled with -std=c++11 and the other with -std=c++20. The sizeof my struct is different in the two compilation units. Is it allowed to…
I've been coding with plain C for the last few months because of our university curriculum. The programs I write are quite small and very not-resource-demanding. As a result, compiling with gcc has always been an almost instantaneous process (40ms…
Below is the code I'm compiling: #include <stdio.h> void main() { printf("Hello%cWorldn", 0); } Below is the compiler output: HelloWorld Bing Chat-GPT response:start Below is the same output by Bing chat-gpt in creative mode Copilot: The output of printf("Hello%cWorldn", 0)…
I am working through the Harvard cs50x courses and I have purposefully been avoiding using their cs50.h library so that I don't have another hoop to jump through re-learning how to code certain things in C. Here is my code:…
This is how LWT_ELEMID defined in liblwgeom_topo.h: typedef int64_t LWT_INT64; typedef LWT_INT64 LWT_ELEMID; I include this .h file and define some argument in LWT_ELEMID type. But it always warns me like this: /home/user/xxx.c:880:36: warning: format '%lld' expects argument of type…
I am using Ubuntu 22.04 and I have an STM32F4 Discovery board which has an stf32f407vg MCU on it. I am trying to learn about linker scripts and starting files. I have written a small linker(ld file) and start up…