I have a docker container that has been successfully installing GDAL 3.5.0 up until Nov 8th, 2022. The last passing build with the exact same code was on Nov 7th. The failures occur in a remote environment on the default…
There are dynamic libraries provided by others, which are out of my control. What I know is that most of the aforementioned libraries are compiled by g++4.9.4 & g++4.8.4 with C++11 support, and few libraries are compiled by g++11.1.0 with…
I'm currently trying to build code using gcc / g++ like this: g++-10 -std=c++2a -Wall -Wextra -c -o hw01.o hw01.cpp (Also the same outcome with gcc-10, gcc, g++) And I have a static check in my Code: static_assert(__cplusplus >= 202002L);…
I have tested my code developed on a ubuntu 18.04 bionic docker image on a ubuntu 20.04 focal docker image. I saw that there were a problem with my unit test and I have narrowed the root cause to a…
I have this foo.cpp: int add(int a, int b) { return a + b; } int add_wrapper(int a, int b) { return add(a,b); } Compiling like so g++ -c -S -fPIC -O4 -finline-functions foo.cpp -o foo.s Gives the (demangled) assembly:…
I'm using clang++ 10 on Ubuntu 20.04 LTS, with -fsanitize-undefined-trap-on-error -fsanitize=address,undefined,nullability,implicit-integer-truncation,implicit-integer-arithmetic-value-change,implicit-conversion,integer My code is generating random bytes with std::random_device rd; std::mt19937 gen(rd()); std::uniform_int_distribution<uint8_t> dd(0, 255); ... ch = uint8_t(dd(gen)); This last line causes the sanitizer to report undefined behavior is…
Summary Recently I encountered a weird issue regarding LTO and -ffast-math where I got inconsistent result for my "pow" ( in cmath ) calls depending on whether -flto is used. Environment: $ g++ --version g++ (GCC) 8.3.0 Copyright (C) 2018…
I have two servers one of which is running RHEL 7.4 and the other one is CentOS 8 the RHEL comes with gcc 4.8.5 and libc.so.6 at 2.17 the CentOS comes with gcc 8.3.1 and libc 2.28 I built a…
even after cleaning with apt-get clean it says there are broken packages. sudo dpkg -l | grep ^..r as mentioned in [1] returns nothing. $ sudo apt-get install build-essential Reading package lists... Done Building dependency tree Reading state information... Done…
I wanted to try making my own absolute value function. I figured that the fastest way to calculate absolute value would be to simply mask out the sign bit (the last bit in IEEE 754). I wanted to compare it's…