I am trying to compile a simple C program using a musl toolchain v1.2.1 on x86_64 Debian. The program secgetenv.c is as follows: #define _GNU_SOURCE #include <stdlib.h> #include <stdio.h> int main() { char *res; res = secure_getenv("TEST_ENV_VAR"); fprintf(stdout, "%sn", res);…
I am trying to build MariaDB v10.3 with a musl tool chain on x86_64 Debian kernel v4.19. I have mainly been using the musl-gcc gcc wrapper to achieve this. The relevant packages I installed are as follows: musl (1.1.21-2): standard…
Turning on the -Wextra flag to gcc seems to have the effect of disallowing partial initialization of structs. E.g.: // main.c #include <pthread.h> typedef struct S { int i; pid_t pid; } S; int main( int argc, char* argv[] )…
I have my c++ project on rhel6 and it works fine. But on a rhel7 machine, it throws the following error : ImportError: liblzma.so.0: cannot open shared object file: No such file or directory Now, I see, that on rhel7…
I want to redirect stdin to a file, so that I can write to the file and my program prints the character. Below is a simple c code snippet, which prints stdin. The programm is compiled with gcc and runs…
I'm using stdio.h , string.h , math.h in a simple math tool written in C. I hear that -static in gcc does not actually always statically compile libraries (i hear this from Linux-pro jargon which i don't understand) and I…
I'm trying to use the c library function fputc from stdio.h I'm assuming it should work according to the spec at https://linux.die.net/man/3/fputc Specifically, the parts that are of interest are: fputc() writes the character c, cast to an unsigned char,…
Using docker to test and develop an ETL data pipeline with Airflow and AWS glue. I'm currently using this blog post as a guide to launch the containers: https://towardsdatascience.com/develop-glue-jobs-locally-using-docker-containers-bffc9d95bd1 (Dockerfile github link: https://github.com/jnshubham/aws-glue-local-etl-docker/blob/master/Dockerfile). When I run docker build -t glue:latest…
We know machine level code are in form of 0,1 (binary). Now, in c programming using gcc for a program if cmd is - gcc -c ok.c where ok.c is a simple program to print "hi" in c. Now, a…
In order to use the C++17 include <filesystem> I need gcc-9 package in my centos docker. By default centos:latest (aka 8) will install gcc 8.3.1 from the regular distro repo. Is there any PPA, testing repo, whatever, where I can…