install i386-elf-gcc on Ubuntu
I'm building cross-compilation toolchain for Ubuntu following this link (originally for MacOS).After installing a few libraries (qemu-system-x86, build-essential, gcc-multilib), I managed to use...
View ArticleReading a 4 bytes date (big endian) from binary file
I have a date encoded (big endian) in 4 bytes that I'm trying to read from a binary file.I do:char date[4];long seconds;s = read(fd, date, sizeof(char) * 4);seconds = (date[3]<<0) |...
View ArticleDifference between GCC and Clang optimization options [closed]
Precondition: I invoke gcc with -O2 optimization flag and clang with -O2 optimization flag.Does it means the options list passed to the compilers will be the same?Do clang understand standard GCC...
View ArticleIn C language, assuming expression is equal to 0, why !(expression) is also 0?
My gcc version is 12.4.0.code is below:int x1 = 0x80000000;printf("%d\n\n", x1 ^ (~x1 + 1));printf("%d\n\n", !(x1 ^ (~x1 + 1)));I though the output should be 0 and 1, since !0 is 1.However, the output...
View ArticleWhy is that in c language when changing time in srand(time(0)); to...
#include <stdio.h>#include <stdlib.h>#include <time.h>int main() { int n, m; printf("Enter the lower bound (n): "); scanf("%d", &n); printf("Enter the upper bound (m): ");...
View ArticleHow to force compilation error if function return value is not checked?
I want the compiler to emit an error if I'm using a specific function without checking its return value.I'm using GCC in eclipse.For example :int fun (){ return 3;}void main (){ printf("%d",fun ());}I...
View Articlecommand 'gcc' failed with exit status 1
I tried all answers but I can't solve the problem of installing Biopython packageI installed Mingw , but when I try to install the package : python setup.py installI get the following error: running...
View ArticleHow to install GCC for Go on Windows 10?
I want to use external library on Go programming language and i am using this command for instance :go get github.com/alecthomas/gozmqfrom command line, but it gives such an...
View ArticleC Loop Unrolling very inefficient (Clang, GCC,...)
Why do the compilers produce inefficient loop unrolling.GCC Version 14.2Clang Version 19.1.0Compile args for both: -Ofast -lm Example code:#define MIN(a,b) ((a) < (b) ? (a) : (b))void to_test(size_t...
View ArticleEvaluation of defined(x) in a `#pragma message` output string
For debugging purposes, I am trying to output information on whether certain symbols are defined, but without having to impair my code readability with too many #if defined() blocks. I tried using the...
View Articlecant run go code with sqlite3 on windows but works fine on linux
I have to switch to windows for a week and I cant run my projectI installed GCC via Cygwin and added it to path, I can call it from any shell. I set CGOENABLED=1 because it was required but I keep...
View ArticleC Switch/Case compiler produces jump fiesta (GCC very suboptimal)
This question provides kind of an alternative way for the issue described inInefficient Loop Unrolling. But not, this question is absolute independent of the other one.We have a primitive switch/case...
View ArticleUnderstanding the gcc related recipes in Yocto project
I am trying to understand how exactly the concept of toolchain for embedded Linux systems is used/being practiced in the Yocto project but find myself confused.To start with, what I DO understand about...
View ArticleInstalling solver library with MSYS2 - HSL compiling and linking
I am trying to install Coin-HSL (https://licences.stfc.ac.uk/product/coin-hsl) to use with CasADi in Matlab on Windows.I did the following:Install MSYS2 in C:/msys64In MSYS2 I installed the required...
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gcc not recognized even after adding mingw64 environment variable [duplicate]
I'm trying to get gcc to work on my computer, and am not able to run the gcc command at all. I've added C:\msys64\mingw64\bin to my environment variables and running gcc is met with "The term 'gcc' is...
View ArticleError: command 'gcc' failed with exit status when installing psycopg2
I need to install psycopg2 for openerp installation process, but I always faced that error. I've already used pip and easy_install and my gcc is the latest version. I really need your help to solve my...
View ArticleWhat exactly does `-rdynamic` do and when exactly is it needed?
What exactly does -rdynamic (or --export-dynamic at the linker level) do and how does it relate to symbol visibility as defined by the -fvisibility* flags or visibility pragmas and __attribute__s?For...
View ArticleWhy do GCC and Clang stop using RIP relative loads for arrays bigger than 16MB?
My understanding is that RIP relative addressing should work for offsets up to 2GB in size, but for some reason GCC (14.2) and Clang (19.1.0) stop using it when grabbing values more than 16MB...
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When ever i try to debug my c++ file in vc code it shows me these errors
When i try to run the file it shows The preLaunchTask 'C/C++: g++.exe build active file' terminated with exit code 1 then there are two error messages along with it along with the error boxI tried to...
View Articleuse of -mcmodel=kernel flag in x86 platform
I am trying to cross compile a device driver built for x86 architecture to arm platform. It got compiled without any errors, but I dont think whole features are available. So I checked the makefile and...
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