libclang_rt.asan_osx_dynamic.dylib has incorrect dylib id

[acmorrow (Andrew C. Morrow)]

I'm using clang-3.3 @3.3-r173279:

> /opt/local/bin/clang-mp-3.3 --version
clang version 3.3 (trunk 173279)
Target: x86_64-apple-darwin12.3.0
Thread model: posix

Given a simple hello world C++ program compiled with -fsanitize=address, the resulting binary cannot execute.

>  cat ./hello_world.cpp
#include <cstdlib>
#include <iostream>

int main(int argc, char* argv[]) {
  std::cout << "Hello, World!\n";
  return EXIT_SUCCESS;
}
>  /opt/local/bin/clang-mp-3.3 ./hello_world.cpp -fsanitize=address -o ./hello_world
>  ./hello_world
dyld: Library not loaded: /opt/local/var/macports/build/_opt_mports_dports_lang_llvm-3.3/clang-3.3/work/trunk/Release+Debug+Asserts/lib/clang/3.3/lib/darwin/libclang_rt.asan_osx_dynamic.dylib
  Referenced from: hello_world/./hello_world
  Reason: image not found
[1]    62828 trace trap  ./hello_world

It looks as if it is looking for the asan support library in the original build path, not the install path. But we do find that library in the install for the port:

>  mdfind -name libclang_rt.asan_osx_dynamic.dylib
/opt/local/libexec/llvm-3.3/lib/clang/3.3/lib/darwin/libclang_rt.asan_osx_dynamic.dylib

Adding the containing directory to the DYLD_LIBRARY_PATH fixes things: the binary now runs:

>  DYLD_LIBRARY_PATH=/opt/local/libexec/llvm-3.3/lib/clang/3.3/lib/darwin ./hello_world
Hello, World!

AddressSanitizer is super useful, it would be great if it worked out of the box for macports clang.

[acmorrow (Andrew C. Morrow)]

Cc Me!

[larryv (Lawrence Velázquez)]

Thanks for the ticket. In the future, please Cc relevant port maintainers. Also, you don’t have to Cc yourself.

[acmorrow (Andrew C. Morrow)]

One workaround for this is to change to the directory where libclang_rt.asan lives and use install_name_tool to patch it up:

$ mdfind -name libclang_rt.asan_osx_dynamic.dylib
/opt/local/libexec/llvm-3.4/lib/clang/3.4/lib/darwin/libclang_rt.asan_osx_dynamic.dylib
/opt/local/libexec/llvm-3.3/lib/clang/3.3/lib/darwin/libclang_rt.asan_osx_dynamic.dylib
/opt/local/libexec/llvm-3.2/lib/clang/3.2/lib/darwin/libclang_rt.asan_osx_dynamic.dylib
$ cd /opt/local/libexec/llvm-3.4/lib/clang/3.4/lib/darwin/
$ sudo install_name_tool -id $(grealpath ./libclang_rt.asan_osx_dynamic.dylib) ./libclang_rt.asan_osx_dynamic.dylib

You will need to re-link any executables built with -fsanitize=address so they pick up the new install name. Obviously, if you re-install the port, you will need to redo this.

[ryandesign (Ryan Carsten Schmidt)]

Has duplicate #39267.

[jeremyhu (Jeremy Huddleston Sequoia)]

I'll pull this into the next llvm bump.

[cooljeanius (Eric Gallager)]

Cc Me!

[jeremyhu (Jeremy Huddleston Sequoia)]

r109324