Ubuntu – Function in C faster than in C++
I want to write a small library, which has to do some calculations. The library should be written in C++ with a wrapper in C to allow external calls. As an example, the C++ code would like this (just a…
Visual Studio Code – Why does this simple code not consistently compile?
The following code compiles on g++, clang, and Visual Studio: #define HEX(hex_) 0x##hex_ int main() { return HEX(BadC0de); } as does this modification, using C++14 digit separators: return HEX(1'Bad'C0de); But this won't compile on g++ or clang (it works on…
Ubuntu – convert gcc forward-declared nested function to clang blocks
I know this is impossible because I've spent hours on it and also read these below but I am determined to approximate a clang block forward definition even if it takes linker tricks or inline assembly: I did my homework…
"/usr/bin/ld: cannot find -lstdc++: No such file or directory" on running flutter linux app – Ubuntu
getting this error on flutter run for a linux desktop application Running "flutter pub get" in proj... 5.3s Launching lib/main.dart on Linux in debug mode... CMake Error at /usr/share/cmake-3.22/Modules/CMakeTestCXXCompiler.cmake:62 (message): The C++ compiler "/usr/bin/clang++" is not able to compile a…
Xcode – libclang_rt.asan_osx_dynamic.dylib in release builds
I just noticed that libclang_rt.asan_osx_dynamic.dylib is in the release build of my macOS app's Contents/Frameworks/ directory. I was under the impression that the address sanitizer is a debug feature, so I was surprised to see this. I'm using xcodebuild in…
apt.llvm.org clang-15 is not able to compile with C++17 feature std::execution::par – Ubuntu
for cross-reference: i asked also at llvm-bug-tracker: https://github.com/llvm/llvm-project/issues/57898 Steps to reproduce: Ubuntu with clang from apt.llvm.org and with potential pstl backends installed via libtbb2-dev and clang-15-openmp is not able to compile with C++17 feature std::execution::par. Dockerfile: FROM ubuntu:22.04 RUN apt-get…
Visual Studio Code – VSC run code analysis __float128 is not supported on this target
Every time I run code analysis in C++ project I receive __float128 is not supported on this target Is any possibility to turn off those kind of clang errors? I have been searching answer for hours, but could not find…
Ubuntu – Undefined behavior (according to clang -fsanitize=integer) on libstdc++ std::random due to negative index on Mersenne Twister engine
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…
Install llvm-toolset-10.0 or newer in Centos7
I used docker image docker run -ti centos:7 /bin/bash, i try install llvm-toolset-10.0 like this yum install llvm-toolset-10.0 but got error No package llvm-toolset-10.0 available. After that i tried use pre-built binraries from https://github.com/llvm/llvm-project/releases, but got bash: ./clang: cannot execute…
Xcode – Clang libFizzer for AArch64 architecture
I would like to perform some fuzz testing on a command-line application I am working on. I am on an M1 Mac, and apple developer tools does not ship clang with libFuzzer. So I followed this SO post's answer and…