Unable to get working RPATH (even absolute) on macOS

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Unable to get working RPATH (even absolute) on macOS

Nicholas Devenish
Hi All,

Like many, I've been having trouble understanding the RPATH control settings.

In particular, I can't seem to get external libraries (e.g. boost) to link in
*any* way that allows it to find dependent libraries without DYLD_LIBRARY_PATH.
Eventually I'd like to refer to them with relative paths (build or install) but
want to just get it working first. CMakeLists to reproduce, on macOS 10.13.4,
cmake 3.12.4:

    cmake_minimum_required(VERSION 3.8 FATAL_ERROR)

    find_package(Boost COMPONENTS thread REQUIRED)
    file(WRITE test.cpp "int main(){return 0;}")

    add_executable(main test.cpp)
    target_link_libraries(main Boost::thread )


Building works fine but it can't find the library, from build:

  $ cmake .. -DBOOST_ROOT=/full/path/to/boost -DCMAKE_INSTALL_PREFIX=../install
  $ make
  $ ./main
  dyld: Library not loaded: libboost_thread.dylib
    Referenced from: /Users/nickd/test_cmr/_b/./main
    Reason: image not found
  Abort trap: 6

or from install:

  $ make install
  $ ../install/main
  dyld: Library not loaded: libboost_thread.dylib
    Referenced from: /Users/nickd/test_cmr/_b/../install/main
    Reason: image not found
  Abort trap: 6

Using `otool -l main` also shows just the library name stored in the
Load command,
and no RPATH entries (and no output from `otool -l main | grep LC_RPATH -A2`)

Trying to follow
it seems to imply that by default "full" RPaths will be used, and that with the
MACOSX_RPATH flag set this should be the same for mac (but this policy
is now the default - and I checked that cmake_policy(GET CMP00042 var)
== NEW, and also setting manually). I tried the "Always full RPATH"
code block and it didn't seem to change anything. In fact the exact
same example above seems to work on linux, with the executable running

  $ readelf -d main | grep rpath
   0x000000000000000f (RPATH)              Library rpath:

I'm also aware that macOS RPATH handling was supposedly somewhat ah,
reduced when SIP was brought in, but my understanding was that only
applied to libraries in the system-bundled folders.

Any ideas or guidance? What am I doing wrong?


Nick Devenish

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