The source hashes are wrong. EDIT: well, not for llvm package itself...

It seems you copied the files from some older nixpkgs version and therefore missed changes, e.g. around man pages in llvm. (Copying is prone to this, unfortunately.)

Hmm, llvm tests now try stuff with suid/sgid permission bits and thus fail when sandboxed :-/

This is what I've been using to disable those tests on 5+, basically nuke the entire Path unittest.

A better approach would be to patch out the failing tests, but thought I'd share anyway in case it's useful:

    # FileSystem permissions tests fail with various special bits
    substituteInPlace llvm/unittests/Support/CMakeLists.txt \
      --replace "Path.cpp" ""
    rm llvm/unittests/Support/Path.cpp

Alright here's where I'm at:

• I created this PR against c5badb1 which is what nixos-version reports for me. I'm confused about that because llvm is at 4.0.0 there:

  nixpkgs/pkgs/development/compilers/llvm/4/default.nix

  Line 5 in c5badb1

  release_version = "4.0.0";

  however 4.0.1 is the one that gets installed if I do, e.g. nix-shell -p llvm_4
• I updated this PR with the correct hashes and some other fixes.
• I tried getting a diff of changes from c5badb1 to master and applying those to this PR, but there were many conflicts and I gave up. I think this work should be done by hand instead of with diff/patch. Or a better strategy would be to diff 4/5 and manually apply these changes to master.
• I tried nix-build -A llvmPackages in the changes based on c5badb1 and ran into this problem:

[ 62%] Python script building LLDB Python wrapper
ERROR:root:swig failed with error code 1: stdout=, stderr=/tmp/nix-build-lldb-5.0.0rc2.drv-0/lldb-5.0.0rc2.src/scripts/lldb.swig:53: Error: CPP #error "Swig versions 3.0.9 and 3.0.10 are incompatible with lldb.". Use the -cpperraswarn option to continue swig processing.

ERROR:root:command line:
/nix/store/51bv29hki7y8jpb13iqdnlw52vgni3r8-swig-3.0.10/bin/swig -c++ -shadow -python -threads -I/tmp/nix-build-lldb-5.0.0rc2.drv-0/lldb-5.0.0rc2.src/include -I. -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -outdir /tmp/nix-build-lldb-5.0.0rc2.drv-0/lldb-5.0.0rc2.src/build/scripts -o /tmp/nix-build-lldb-5.0.0rc2.drv-0/lldb-5.0.0rc2.src/build/scripts/LLDBWrapPython.cpp /tmp/nix-build-lldb-5.0.0rc2.drv-0/lldb-5.0.0rc2.src/scripts/lldb.swig
make[2]: *** [scripts/CMakeFiles/swig_wrapper.dir/build.make:136: scripts/LLDBWrapPython.cpp] Error 1
make[1]: *** [CMakeFiles/Makefile2:145: scripts/CMakeFiles/swig_wrapper.dir/all] Error 2
make: *** [Makefile:128: all] Error 2

• I tried the following file with NIX_PATH=nixpkgs=/home/andy/dev/nixpkgs nix-shell ~/env/zig-llvm5.nix (nixpkgs with this PR based on c5badb1) and all zig tests passed:

with import <nixpkgs> {}; {
  tmpAoeu = stdenv.mkDerivation {
    name = "tmpAoeu";

    hardeningDisable = [ "all" ];
    buildInputs = [
      cmake
      llvmPackages_5.clang-unwrapped
      llvm_5
      lld
    ];
  };
}

Here are the rc3 hashes: andrewrk@f18e59c

This seems dead, probably should be closed in favor of #29541 .