From: cgmb@debian.org   
      
   Package: clang-21   
   Version: 1:21.1.8-3+b1   
   Severity: normal   
   X-Debbugs-Cc: cgmb@debian.org, rocm.compiler.support@amd.com   
      
   Dear Maintainer,   
      
   While preparing the rccl 6.4.4.1 package, I noticed that clang is searching for   
   libdl.a, but is not finding this library. On Debian, the libdl.a archive   
   resides   
   within /usr/lib/$multiarch, but clang is merely searching /usr/lib.   
      
   I'm unsure of the consequences of this failure to find libdl.a. I found   
   that while building on x86_64, I could ensure that the search succeeded   
   by adding -L/usr/lib/x86_64-linux-gnu to the LDFLAGS when building rccl.   
      
   The compilation command and the error message were:   
      
   # /usr/bin/hipcc -fPIC -gz -g -O2 -ffile-prefix-map=/root/rccl/rccl=.   
   -Xarch_host -fstack-protector-strong -fstack-clash-protection -Wformat   
   -Werror=format-security -Xarch_host -fcf-protection -Wdate-time    
   D_FORTIFY_SOURCE=2 -O3 -DNDEBUG -shared -v -Wl,-   
   z,relro -Wl,-z,now -Xoffload-linker -mllvm=-amdgpu-kernarg-preload-count=16   
   -Xlinker --dependency-file=CMakeFiles/rccl.dir/link.d -Wl,-soname,librccl.so.1   
   -o librccl.so.1.0 CMakeFiles/rccl.dir/hipify/src/bootstrap.cc.o    
   MakeFiles/rccl.dir/hipify/src/   
   channel.cc.o <...>   
   Debian clang version 21.1.8 (3+b1)   
   Target: x86_64-pc-linux-gnu   
   Thread model: posix   
   InstalledDir: /usr/lib/llvm-21/bin   
   Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/15   
   Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/15   
   Candidate multilib: .;@m64   
   Selected multilib: .;@m64   
   Found HIP installation: /usr, version 6.4.43484   
   HIP fatbin symbol search could not find library: libdl.a   
   Found undefined HIP fatbin symbol: __hip_fatbin_1d4e411bebf5072c   
   Found undefined HIP fatbin symbol: __hip_fatbin_232f9491010201eb   
   <...>   
   Found undefined HIP gpubin handle symbol: __hip_gpubin_handle_1d4e411bebf5072c   
   Found undefined HIP gpubin handle symbol: __hip_gpubin_handle_232f9491010201eb   
   <...>   
      
   Sincerely,   
   Cory Bloor   
      
   -- System Information:   
   Debian Release: forky/sid   
     APT prefers unstable   
     APT policy: (500, 'unstable')   
   Architecture: amd64 (x86_64)   
      
   Kernel: Linux 6.17.13+deb13-amd64 (SMP w/12 CPU threads; PREEMPT)   
   Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set   
   Shell: /bin/sh linked to /usr/bin/dash   
   Init: unable to detect   
      
   Versions of packages clang-21 depends on:   
   ii  binutils                2.46-2   
   ii  libc6                   2.42-13   
   ii  libc6-dev               2.42-13   
   ii  libclang-common-21-dev  1:21.1.8-3+b1   
   ii  libclang-cpp21          1:21.1.8-3+b1   
   ii  libclang1-21            1:21.1.8-3+b1   
   ii  libgcc-15-dev           15.2.0-14   
   ii  libgcc-s1               15.2.0-14   
   ii  libllvm21               1:21.1.8-3+b1   
   ii  libobjc-15-dev          15.2.0-14   
   ii  libstdc++-15-dev        15.2.0-14   
   ii  libstdc++6              15.2.0-14   
   ii  llvm-21-linker-tools    1:21.1.8-3+b1   
      
   Versions of packages clang-21 recommends:   
   ii  clang-tools-21  1:21.1.8-3+b1   
   pn  llvm-21-dev        
   ii  python3         3.13.9-3   
      
   Versions of packages clang-21 suggests:   
   pn  clang-21-doc     
   pn  wasi-libc        
      
   -- no debconf information   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)