Using g++-11 with -fsanitize=undefined flag gets ld error

[ryanovovo]

I have tried reinstalling gcc and update command line tools but the error still exists.
I get ld error while compiling the following code.
Mycode:

#include<iostream>
using namespace std;

int main(){
    cout << "Hello World" << endl;
}

ld error message:

ld: library not found for -lubsan
collect2: error: ld returned 1 exit status

compile command:
g++-11 test.cpp -fsanitize=undefined -o test

brew config:

HOMEBREW_VERSION: 3.4.11
ORIGIN: https://github.com/Homebrew/brew
HEAD: 30e3d8883cde265cbc16ff94b49a3ac14137590e
Last commit: 2 days ago
Core tap ORIGIN: https://github.com/Homebrew/homebrew-core
Core tap HEAD: 269a608acc9f348370c29afe919fb2c1ba0f001a
Core tap last commit: 4 hours ago
Core tap branch: master
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_CORE_GIT_REMOTE: https://github.com/Homebrew/homebrew-core
HOMEBREW_MAKE_JOBS: 8
Homebrew Ruby: 2.6.8 => /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby
CPU: octa-core 64-bit arm_firestorm_icestorm
Clang: 13.1.6 build 1316
Git: 2.32.0 => /Library/Developer/CommandLineTools/usr/bin/git
Curl: 7.79.1 => /usr/bin/curl
macOS: 12.3.1-arm64
CLT: 13.3.1.0.1.1648687083
Xcode: N/A
Rosetta 2: false

Please help :-)
Thanks in advance.

[carlocab]

Try

g++-11 test.cpp -L"$(brew --prefix gcc)/lib/gcc/11" -fsanitize=undefined -o test

[ryanovovo]

I still get the same error.

ld: library not found for -lubsan
collect2: error: ld returned 1 exit status

[carlocab]

Ah, yes. GCC does not support UBSan on ARM macOS yet, which is why libubsan is not listed when you do

ls -la "$(brew --prefix gcc)/lib/gcc/11"

[ryanovovo]

Get it.
So maybe add -fsanitize-undefined-trap-on-error is a solution?

[carlocab]

Maybe. I don't think that will do what you expect it to do if your program has undefined behaviour, however.

[ryanovovo]

OK. Thanks for your help!