linking clang address sanitizer on FreeBSD 10.1 Release

Question

I'm trying to get address sanitizer working on FreeBSD 10.1 Release, but whenever I try to compile a program with -fsanitize=address I get undefined references to _asan_stack_malloc_1 etc, etc. I found
https://forums.freebsd.org/threads/gcc-clang-address-sanitizer.47985/ on google but the suggestion of adding -L/usr/local/lib -I/usr/local/include didn't resolve the linking issue. I tried the llvm binaries for FreeBSD but when I go to compile with that clang I get /usr/bin/../lib/clang/3.6.0/lib/freebsd/libclang_rt.asan-x86_64.a , no such file or directory. . Either way I'm not sure what library I need to link or where it is.

Below is the program I tried compiling and here is the command I used, clang -fsanitize=address san.c

#include <stdio.h>

int main(void)
{
    return 0;
}

-L /usr/local/lib in your link means that they have compiled a newer version of clang from ports and installed it into /usr/local. Have you done this? — Joshua Clayton
good point, but -L/usr/lib or -L/lib doesn't work either. — 2trill2spill
/usr/bin/clang ` FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512` — 2trill2spill

Kevinoid Kevinoid · Accepted Answer · 2016-07-08T03:31:08

As an alternative to building LLVM, as suggested in this answer on Unix SE, you can install llvm37 from ports, which supports AddressSanitizer, and build with that:

# pkg install llvm37
$ clang37 -fsanitize=address san.c

linking clang address sanitizer on FreeBSD 10.1 Release

2 Answers