Cannot use `-fsanitize=address` with `clang-22`

Question

I am using Debian Unstable/Experimental.

When I use -fsanitize=address with clang-22, it fails with:

/usr/bin/ld: cannot find /usr/lib/llvm-22/lib/clang/22/lib/x86_64-pc-linux-gnu/libclang_rt.asan_static.a: No such file or directory
/usr/bin/ld: cannot find /usr/lib/llvm-22/lib/clang/22/lib/x86_64-pc-linux-gnu/libclang_rt.asan.a: No such file or directory
clang: error: linker command failed with exit code 1 (use -v to see invocation)

In an attempt with a C file, for example:

#include <stdio.h>
#include <unistd.h>

int main() {
    printf("Hello, world!\n");
    *((volatile char*)NULL) = 3;
    return 0;
}

and then compiling it with clang-22 -O3 -Og hello.c -fsanitize=address,undefined -o hello, it fails with the previous linker error. However, using gcc-15 instead of clang-22 compiles flawlessly.

I tried to check for what package provides /usr/lib/llvm-22/lib/clang/22/lib/x86_64-pc-linux-gnu/libclang_rt.asan.a with apt-file search /usr/lib/llvm-22/lib/clang/22/lib/x86_64-pc-linux-gnu/libclang_rt.asan.a, but I found nothing there.

How can I use -fsanitize=address with clang-22 without linker errors?

horsey_guy · Accepted Answer · 2025-08-10 22:29:04Z

0

The solution is to install the libclang-rt-22-dev package, which was somehow not installed even though it was recommended by the libclang-common-22-dev package. It provides the /usr/lib/llvm-22/lib/clang/22/lib/linux/libclang_rt.asan-x86_64.a file, which can be seen with apt-file show libclang-rt-22-dev.

answered Aug 10 at 22:29

horsey_guy

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