[MacPorts] #51542: clang-3.8 and clang-3.9 fail to function due to rpath

[MacPorts]

#51542: clang-3.8 and clang-3.9 fail to function due to rpath
-------------------------------------+------------------------
  Reporter:  kenneth.f.cunningham@…  |      Owner:  jeremyhu@…
      Type:  defect                  |     Status:  new
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:  2.3.4
Resolution:                          |   Keywords:
      Port:  clang-3.8               |
-------------------------------------+------------------------

Comment (by kenneth.f.cunningham@…):

 Thanks for looking. Wish I had your knowledge. I get similar otool output
 to what you get
 {{{
 $ port select --list clang
 Available versions for clang:
         mp-clang-3.4
         mp-clang-3.7
         mp-clang-3.8 (active)
         mp-clang-3.9
         none
 $ port select --list llvm
 Available versions for llvm:
         mp-llvm-3.4
         mp-llvm-3.7
         mp-llvm-3.8 (active)
         mp-llvm-3.9
         none
 $ clang hello.c -o hello
 dyld: Library not loaded: @rpath/libLLVM.dylib
   Referenced from: /opt/local/libexec/llvm-3.8/bin/../lib/libLTO.dylib
   Reason: image not found
 clang: error: unable to execute command: Trace/BPT trap
 clang: error: linker command failed due to signal (use -v to see
 invocation)

 $ otool -l /opt/local/libexec/llvm-3.8/bin/../lib/libLTO.dylib | grep -A2
 LC_RPATH
           cmd LC_RPATH
       cmdsize 32
          path @loader_path (offset 12)
 --
           cmd LC_RPATH
       cmdsize 40
          path @executable_path/../lib (offset 12)
 }}}

 the DYLD_PRINT_RPATHS=1 was not too satisfying - I suspect this might not
 be available on snowleopard as I couldn't find it in the man page for dyld
 on this machine

 {{{
 $ export DYLD_PRINT_RPATHS=1
 $ clang hello.c -o hellodyld: warning, unknown environment variable:
 DYLD_PRINT_RPATHS
 dyld: warning, unknown environment variable: DYLD_PRINT_RPATHS
 dyld: warning, unknown environment variable: DYLD_PRINT_RPATHS
 dyld: warning, unknown environment variable: DYLD_PRINT_RPATHS
 dyld: Library not loaded: @rpath/libLLVM.dylib
   Referenced from: /opt/local/libexec/llvm-3.8/bin/../lib/libLTO.dylib
   Reason: image not found
 clang: error: unable to execute command: Trace/BPT trap
 clang: error: linker command failed due to signal (use -v to see
 invocation)
 }}}

 Switching back to clang-3.7 everything works fine. Here's the output from
 otool for clang-3.7.

 {{{
 $ sudo port select clang mp-clang-3.7
 Selecting 'mp-clang-3.7' for 'clang' succeeded. 'mp-clang-3.7' is now
 active.
 $ sudo port select llvm mp-llvm-3.7
 Selecting 'mp-llvm-3.7' for 'llvm' succeeded. 'mp-llvm-3.7' is now active.
 $ clang hello.c -o hello
 $ otool -l /opt/local/libexec/llvm-3.7/bin/../lib/libLTO.dylib | grep -A2
 LC_RPATH
           cmd LC_RPATH
       cmdsize 40
          path @executable_path/../lib (offset 12)
 }}}

 and finally, of course setting the library fallback path manually works

 {{{

 $ export DYLD_FALLBACK_LIBRARY_PATH=/opt/local/libexec/llvm-3.9/lib/
 $ clang -v hello.c -o hello
 clang version 3.9.0 (trunk 270400)
 Target: x86_64-apple-darwin10.8.0
 Thread model: posix
 InstalledDir: /opt/local/libexec/llvm-3.9/bin
  "/opt/local/libexec/llvm-3.9/bin/clang" -cc1 -triple x86_64-apple-
 macosx10.6.0 -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage
 -emit-obj -mrelax-all -disable-free -main-file-name hello.c -mrelocation-
 model pic -pic-level 2 -mthread-model posix -mdisable-fp-elim -masm-
 verbose -munwind-tables -target-cpu core2 -target-linker-version 136 -v
 -dwarf-column-info -debugger-tuning=lldb -resource-dir
 /opt/local/libexec/llvm-3.9/bin/../lib/clang/3.9.0 -fdebug-compilation-dir
 /Users/Shared/test_llvm -ferror-limit 19 -fmessage-length 80 -stack-
 protector 1 -fblocks -fobjc-runtime=macosx-10.6.0 -fencode-extended-block-
 signature -fmax-type-align=16 -fdiagnostics-show-option -fcolor-
 diagnostics -o /var/folders/I0/I0fOotq3ErGZHYxrmmWiqU+++TI/-Tmp-/hello-
 49b326.o -x c hello.c
 clang -cc1 version 3.9.0 based upon LLVM 3.9.0svn default target x86_64
 -apple-darwin10.8.0
 #include "..." search starts here:
 #include <...> search starts here:
  /usr/local/include
  /opt/local/libexec/llvm-3.9/bin/../lib/clang/3.9.0/include
  /usr/include
  /System/Library/Frameworks (framework directory)
  /Library/Frameworks (framework directory)
 End of search list.
  "/opt/local/libexec/llvm-3.9/bin/ld" -demangle -dynamic -arch x86_64
 -macosx_version_min 10.6.0 -o hello -lcrt1.10.6.o
 /var/folders/I0/I0fOotq3ErGZHYxrmmWiqU+++TI/-Tmp-/hello-49b326.o -lSystem
 /opt/local/libexec/llvm-3.9/bin/../lib/clang/3.9.0/lib/darwin/libclang_rt.osx.a

 $ ./hello
 hello world
 }}}

 just odd I didn't have to do that manual lib path setting for clang-3.7

 hope this is helpful to someone

-- 
Ticket URL: <https://trac.macports.org/ticket/51542#comment:5>
MacPorts <https://www.macports.org/>
Ports system for OS X