diff --git a/pkgs/development/compilers/llvm/3.8/D17533-1.patch b/pkgs/development/compilers/llvm/3.8/D17533-1.patch
deleted file mode 100644
index 79ca953d6e5b..000000000000
--- a/pkgs/development/compilers/llvm/3.8/D17533-1.patch
+++ /dev/null
@@ -1,60 +0,0 @@
-commit eb92f5a745014532b83abfba04602fce87ca8393
-Author: Chuang-Yu Cheng <cycheng@multicorewareinc.com>
-Date:   Fri Apr 8 12:04:32 2016 +0000
-
-    CXX_FAST_TLS calling convention: performance improvement for PPC64
-    
-    This is the same change on PPC64 as r255821 on AArch64. I have even borrowed
-    his commit message.
-    
-    The access function has a short entry and a short exit, the initialization
-    block is only run the first time. To improve the performance, we want to
-    have a short frame at the entry and exit.
-    
-    We explicitly handle most of the CSRs via copies. Only the CSRs that are not
-    handled via copies will be in CSR_SaveList.
-    
-    Frame lowering and prologue/epilogue insertion will generate a short frame
-    in the entry and exit according to CSR_SaveList. The majority of the CSRs will
-    be handled by register allcoator. Register allocator will try to spill and
-    reload them in the initialization block.
-    
-    We add CSRsViaCopy, it will be explicitly handled during lowering.
-    
-    1> we first set FunctionLoweringInfo->SplitCSR if conditions are met (the target
-       supports it for the given machine function and the function has only return
-       exits). We also call TLI->initializeSplitCSR to perform initialization.
-    2> we call TLI->insertCopiesSplitCSR to insert copies from CSRsViaCopy to
-       virtual registers at beginning of the entry block and copies from virtual
-       registers to CSRsViaCopy at beginning of the exit blocks.
-    3> we also need to make sure the explicit copies will not be eliminated.
-    
-    Author: Tom Jablin (tjablin)
-    Reviewers: hfinkel kbarton cycheng
-    
-    http://reviews.llvm.org/D17533
-    
-    git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265781 91177308-0d34-0410-b5e6-96231b3b80d8
-
-diff --git a/lib/CodeGen/TargetFrameLoweringImpl.cpp b/lib/CodeGen/TargetFrameLoweringImpl.cpp
-index 679ade1..0a0e079 100644
---- a/lib/CodeGen/TargetFrameLoweringImpl.cpp
-+++ b/lib/CodeGen/TargetFrameLoweringImpl.cpp
-@@ -63,12 +63,15 @@ void TargetFrameLowering::determineCalleeSaves(MachineFunction &MF,
-   const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo();
-   const MCPhysReg *CSRegs = TRI.getCalleeSavedRegs(&MF);
- 
-+  // Resize before the early returns. Some backends expect that
-+  // SavedRegs.size() == TRI.getNumRegs() after this call even if there are no
-+  // saved registers.
-+  SavedRegs.resize(TRI.getNumRegs());
-+
-   // Early exit if there are no callee saved registers.
-   if (!CSRegs || CSRegs[0] == 0)
-     return;
- 
--  SavedRegs.resize(TRI.getNumRegs());
--
-   // In Naked functions we aren't going to save any registers.
-   if (MF.getFunction()->hasFnAttribute(Attribute::Naked))
-     return;
diff --git a/pkgs/development/compilers/llvm/3.8/clang/default.nix b/pkgs/development/compilers/llvm/3.8/clang/default.nix
deleted file mode 100644
index 47a1bed126da..000000000000
--- a/pkgs/development/compilers/llvm/3.8/clang/default.nix
+++ /dev/null
@@ -1,80 +0,0 @@
-{ stdenv, fetch, cmake, libxml2, llvm, version, clang-tools-extra_src, python }:
-
-let
-  gcc = if stdenv.cc.isGNU then stdenv.cc.cc else stdenv.cc.cc.gcc;
-  self = stdenv.mkDerivation {
-    name = "clang-${version}";
-
-    src = fetch "cfe" "1prc72xmkgx8wrzmrr337776676nhsp1qd3mw2bvb22bzdnq7lsc";
-
-    unpackPhase = ''
-      unpackFile $src
-      mv cfe-${version}.src clang
-      sourceRoot=$PWD/clang
-      unpackFile ${clang-tools-extra_src}
-      mv clang-tools-extra-* $sourceRoot/tools/extra
-    '';
-
-    nativeBuildInputs = [ cmake ];
-    buildInputs = [ libxml2 llvm python ];
-
-    cmakeFlags = [
-      "-DCMAKE_CXX_FLAGS=-std=c++11"
-    ] ++
-    # Maybe with compiler-rt this won't be needed?
-    (stdenv.lib.optional stdenv.isLinux "-DGCC_INSTALL_PREFIX=${gcc}") ++
-    (stdenv.lib.optional (stdenv.cc.libc != null) "-DC_INCLUDE_DIRS=${stdenv.cc.libc}/include");
-
-    patches = [ ./purity.patch ];
-
-    postPatch = ''
-      sed -i -e 's/Args.hasArg(options::OPT_nostdlibinc)/true/' lib/Driver/Tools.cpp
-      sed -i -e 's/DriverArgs.hasArg(options::OPT_nostdlibinc)/true/' lib/Driver/ToolChains.cpp
-    '' + stdenv.lib.optionalString stdenv.hostPlatform.isMusl ''
-      sed -i -e 's/lgcc_s/lgcc_eh/' lib/Driver/Tools.cpp
-    '';
-
-    outputs = [ "out" "lib" "python" ];
-
-    # Clang expects to find LLVMgold in its own prefix
-    # Clang expects to find sanitizer libraries in its own prefix
-    postInstall = ''
-      if [ -e ${llvm}/lib/LLVMgold.so ]; then
-        ln -sv ${llvm}/lib/LLVMgold.so $out/lib
-      fi
-
-      ln -sv ${llvm}/lib/clang/${version}/lib $out/lib/clang/${version}/
-      ln -sv $out/bin/clang $out/bin/cpp
-
-      # Move libclang to 'lib' output
-      moveToOutput "lib/libclang.*" "$lib"
-      substituteInPlace $out/share/clang/cmake/ClangTargets-release.cmake \
-          --replace "\''${_IMPORT_PREFIX}/lib/libclang." "$lib/lib/libclang."
-
-      mkdir -p $python/bin $python/share/clang/
-      mv $out/bin/{git-clang-format,scan-view} $python/bin
-      if [ -e $out/bin/set-xcode-analyzer ]; then
-        mv $out/bin/set-xcode-analyzer $python/bin
-      fi
-      mv $out/share/clang/*.py $python/share/clang
-
-      rm $out/bin/c-index-test
-    '';
-
-    enableParallelBuilding = true;
-
-    passthru = {
-      isClang = true;
-      inherit llvm;
-    } // stdenv.lib.optionalAttrs stdenv.isLinux {
-      inherit gcc;
-    };
-
-    meta = {
-      description = "A c, c++, objective-c, and objective-c++ frontend for the llvm compiler";
-      homepage    = http://llvm.org/;
-      license     = stdenv.lib.licenses.ncsa;
-      platforms   = stdenv.lib.platforms.all;
-    };
-  };
-in self
diff --git a/pkgs/development/compilers/llvm/3.8/clang/purity.patch b/pkgs/development/compilers/llvm/3.8/clang/purity.patch
deleted file mode 100644
index 2d1c68d865e6..000000000000
--- a/pkgs/development/compilers/llvm/3.8/clang/purity.patch
+++ /dev/null
@@ -1,17 +0,0 @@
---- a/lib/Driver/Tools.cpp	2016-02-12 15:51:41.000000000 -0700
-+++ b/lib/Driver/Tools.cpp	2016-03-08 15:39:06.790111122 -0700
-@@ -8833,15 +8833,6 @@
-     CmdArgs.push_back("-shared");
-   }
- 
--  if (Arch == llvm::Triple::arm || Arch == llvm::Triple::armeb ||
--      Arch == llvm::Triple::thumb || Arch == llvm::Triple::thumbeb ||
--      (!Args.hasArg(options::OPT_static) &&
--       !Args.hasArg(options::OPT_shared))) {
--    CmdArgs.push_back("-dynamic-linker");
--    CmdArgs.push_back(Args.MakeArgString(
--        D.DyldPrefix + getLinuxDynamicLinker(Args, ToolChain)));
--  }
--
-   CmdArgs.push_back("-o");
-   CmdArgs.push_back(Output.getFilename());
diff --git a/pkgs/development/compilers/llvm/3.8/default.nix b/pkgs/development/compilers/llvm/3.8/default.nix
deleted file mode 100644
index a848c8b9252b..000000000000
--- a/pkgs/development/compilers/llvm/3.8/default.nix
+++ /dev/null
@@ -1,59 +0,0 @@
-{ newScope, stdenv, libstdcxxHook, isl, fetchurl, overrideCC, wrapCCWith
-, buildLlvmTools # tools, but from the previous stage, for cross
-, targetLlvmLibraries # libraries, but from the next stage, for cross
-}:
-
-let
-  version = "3.8.1";
-
-  fetch = fetch_v version;
-  fetch_v = ver: name: sha256: fetchurl {
-    url = "https://releases.llvm.org/${ver}/${name}-${ver}.src.tar.xz";
-    inherit sha256;
-  };
-
-  compiler-rt_src = fetch "compiler-rt" "0p0y85c7izndbpg2l816z7z7558axq11d5pwkm4h11sdw7d13w0d";
-  clang-tools-extra_src = fetch "clang-tools-extra" "15n39r4ssphpaq4a0wzyjm7ilwxb0bch6nrapy8c5s8d49h5qjk6";
-
-  tools = stdenv.lib.makeExtensible (tools: let
-    callPackage = newScope (tools // { inherit stdenv isl version fetch; });
- in {
-    llvm = callPackage ./llvm.nix {
-      inherit compiler-rt_src;
-    };
-
-    clang-unwrapped = callPackage ./clang {
-      inherit clang-tools-extra_src;
-    };
-
-    libclang = tools.clang-unwrapped.lib;
-
-    clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
-
-    libstdcxxClang = wrapCCWith {
-      cc = tools.clang-unwrapped;
-      extraPackages = [ libstdcxxHook ];
-    };
-
-    libcxxClang = wrapCCWith {
-      cc = tools.clang-unwrapped;
-      extraPackages = [ targetLlvmLibraries.libcxx targetLlvmLibraries.libcxxabi ];
-    };
-
-    lldb = callPackage ./lldb.nix {};
-  });
-
-  libraries = stdenv.lib.makeExtensible (libraries: let
-    callPackage = newScope (libraries // buildLlvmTools // { inherit stdenv isl version fetch; });
-  in {
-
-    stdenv = overrideCC stdenv buildLlvmTools.clang;
-
-    libcxxStdenv = overrideCC stdenv buildLlvmTools.libcxxClang;
-
-    libcxx = callPackage ./libc++ {};
-
-    libcxxabi = callPackage ./libc++abi.nix {};
-  });
-
-in { inherit tools libraries; } // libraries // tools
diff --git a/pkgs/development/compilers/llvm/3.8/fix-llvm-config.patch b/pkgs/development/compilers/llvm/3.8/fix-llvm-config.patch
deleted file mode 100644
index 6e56c67c8977..000000000000
--- a/pkgs/development/compilers/llvm/3.8/fix-llvm-config.patch
+++ /dev/null
@@ -1,11 +0,0 @@
---- llvm.org/utils/llvm-build/llvmbuild/main.py	2015-10-07 00:24:35.000000000 +0100
-+++ llvm/utils/llvm-build/llvmbuild/main.py	2017-06-16 17:08:39.866586578 +0100
-@@ -413,7 +413,7 @@
-             if library_name is None:
-                 library_name_as_cstr = 'nullptr'
-             else:
--                library_name_as_cstr = '"lib%s.a"' % library_name
-+                library_name_as_cstr = '"lib%s.so"' % library_name
-             if is_installed:
-                 is_installed_as_cstr = 'true'
-             else:
diff --git a/pkgs/development/compilers/llvm/3.8/libc++/darwin.patch b/pkgs/development/compilers/llvm/3.8/libc++/darwin.patch
deleted file mode 100644
index 6dd756f01cc2..000000000000
--- a/pkgs/development/compilers/llvm/3.8/libc++/darwin.patch
+++ /dev/null
@@ -1,39 +0,0 @@
---- libcxx-3.8.0.src.org/lib/CMakeLists.txt	2015-12-16 15:41:05.000000000 -0800
-+++ libcxx-3.8.0.src/lib/CMakeLists.txt	2016-06-17 19:40:00.293394500 -0700
-@@ -94,30 +94,30 @@
-     add_definitions(-D__STRICT_ANSI__)
-     add_link_flags(
-       "-compatibility_version 1"
-       "-current_version 1"
--      "-install_name /usr/lib/libc++.1.dylib"
--      "-Wl,-reexport_library,/usr/lib/libc++abi.dylib"
-+      "-install_name ${LIBCXX_LIBCXXABI_LIB_PATH}/libc++.1.dylib"
-+      "-Wl,-reexport_library,${LIBCXX_LIBCXXABI_LIB_PATH}/libc++abi.dylib"
-       "-Wl,-unexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/libc++unexp.exp"
-       "/usr/lib/libSystem.B.dylib")
-   else()
-     if ( ${CMAKE_OSX_SYSROOT} )
-       list(FIND ${CMAKE_OSX_ARCHITECTURES} "armv7" OSX_HAS_ARMV7)
-       if (OSX_HAS_ARMV7)
-         set(OSX_RE_EXPORT_LINE
--          "${CMAKE_OSX_SYSROOT}/usr/lib/libc++abi.dylib"
-+          "${CMAKE_OSX_SYSROOT}${LIBCXX_LIBCXXABI_LIB_PATH}/libc++abi.dylib"
-           "-Wl,-reexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/libc++sjlj-abi.exp")
-       else()
-         set(OSX_RE_EXPORT_LINE
--          "-Wl,-reexport_library,${CMAKE_OSX_SYSROOT}/usr/lib/libc++abi.dylib")
-+          "-Wl,-reexport_library,${CMAKE_OSX_SYSROOT}${LIBCXX_LIBCXXABI_LIB_PATH}/libc++abi.dylib")
-       endif()
-     else()
--      set(OSX_RE_EXPORT_LINE "/usr/lib/libc++abi.dylib -Wl,-reexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/libc++abi${LIBCXX_LIBCPPABI_VERSION}.exp")
-+      set(OSX_RE_EXPORT_LINE "${LIBCXX_LIBCXXABI_LIB_PATH}/libc++abi.dylib -Wl,-reexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/libc++abi${LIBCXX_LIBCPPABI_VERSION}.exp")
-     endif()
- 
-     add_link_flags(
-       "-compatibility_version 1"
--      "-install_name /usr/lib/libc++.1.dylib"
-+      "-install_name ${LIBCXX_LIBCXXABI_LIB_PATH}/libc++.1.dylib"
-       "-Wl,-unexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/libc++unexp.exp"
-       "${OSX_RE_EXPORT_LINE}"
-       "-Wl,-force_symbols_not_weak_list,${CMAKE_CURRENT_SOURCE_DIR}/notweak.exp"
-       "-Wl,-force_symbols_weak_list,${CMAKE_CURRENT_SOURCE_DIR}/weak.exp")
diff --git a/pkgs/development/compilers/llvm/3.8/libc++/default.nix b/pkgs/development/compilers/llvm/3.8/libc++/default.nix
deleted file mode 100644
index 5a0410302f2f..000000000000
--- a/pkgs/development/compilers/llvm/3.8/libc++/default.nix
+++ /dev/null
@@ -1,52 +0,0 @@
-{ lib, stdenv, fetch, cmake, libcxxabi, fixDarwinDylibNames, version }:
-
-stdenv.mkDerivation rec {
-  name = "libc++-${version}";
-
-  src = fetch "libcxx" "1k7f9qk5bgwa02ksh6yr9hccwcbhmcdzl1fpbdw6s2c89iwg7mvp";
-
-  postUnpack = ''
-    unpackFile ${libcxxabi.src}
-  '';
-
-  preConfigure = ''
-    # Get headers from the cxxabi source so we can see private headers not installed by the cxxabi package
-    cmakeFlagsArray=($cmakeFlagsArray -DLIBCXX_CXX_ABI_INCLUDE_PATHS="$NIX_BUILD_TOP/libcxxabi-${version}.src/include")
-  '';
-
-  patches = [
-    # glibc 2.26 fix
-    ../../3.9/libc++/xlocale-glibc-2.26.patch
-  ]
-  ++ lib.optional stdenv.isDarwin ./darwin.patch
-  ++ stdenv.lib.optionals stdenv.hostPlatform.isMusl [
-    ../../libcxx-0001-musl-hacks.patch
-    ../../libcxx-max_align_t.patch
-  ];
-
-  nativeBuildInputs = [ cmake ];
-
-  buildInputs = [ libcxxabi ] ++ lib.optional stdenv.isDarwin fixDarwinDylibNames;
-
-  cmakeFlags = [
-    "-DLIBCXX_LIBCXXABI_LIB_PATH=${libcxxabi}/lib"
-    "-DLIBCXX_LIBCPPABI_VERSION=2"
-    "-DLIBCXX_CXX_ABI=libcxxabi"
-  ] ++ stdenv.lib.optional stdenv.hostPlatform.isMusl "-DLIBCXX_HAS_MUSL_LIBC=1";
-
-  enableParallelBuilding = true;
-
-  linkCxxAbi = stdenv.isLinux;
-
-  setupHooks = [
-    ../../../../../build-support/setup-hooks/role.bash
-    ./setup-hook.sh
-  ];
-
-  meta = {
-    homepage = http://libcxx.llvm.org/;
-    description = "A new implementation of the C++ standard library, targeting C++11";
-    license = with stdenv.lib.licenses; [ ncsa mit ];
-    platforms = stdenv.lib.platforms.unix;
-  };
-}
diff --git a/pkgs/development/compilers/llvm/3.8/libc++/setup-hook.sh b/pkgs/development/compilers/llvm/3.8/libc++/setup-hook.sh
deleted file mode 100644
index 6611259165ae..000000000000
--- a/pkgs/development/compilers/llvm/3.8/libc++/setup-hook.sh
+++ /dev/null
@@ -1,6 +0,0 @@
-# See pkgs/build-support/setup-hooks/role.bash
-getHostRole
-
-linkCxxAbi="@linkCxxAbi@"
-export NIX_${role_pre}CXXSTDLIB_COMPILE+=" -isystem @out@/include/c++/v1"
-export NIX_${role_pre}CXXSTDLIB_LINK=" -stdlib=libc++${linkCxxAbi:+" -lc++abi"}"
diff --git a/pkgs/development/compilers/llvm/3.8/libc++abi.nix b/pkgs/development/compilers/llvm/3.8/libc++abi.nix
deleted file mode 100644
index 8b25681c2dbf..000000000000
--- a/pkgs/development/compilers/llvm/3.8/libc++abi.nix
+++ /dev/null
@@ -1,51 +0,0 @@
-{ stdenv, cmake, fetch, libcxx, libunwind, llvm, version }:
-
-stdenv.mkDerivation {
-  name = "libc++abi-${version}";
-
-  src = fetch "libcxxabi" "1qfs2iis1i0ppv11jndc98cvd7s25pj46pq2sfyldmzswdxmzdg1";
-
-  nativeBuildInputs = [ cmake ];
-  buildInputs = stdenv.lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD) libunwind;
-
-  postUnpack = ''
-    unpackFile ${libcxx.src}
-    unpackFile ${llvm.src}
-    export NIX_CFLAGS_COMPILE+=" -I$PWD/include"
-    export cmakeFlags="-DLLVM_PATH=$PWD/$(ls -d llvm-*) -DLIBCXXABI_LIBCXX_INCLUDES=$PWD/$(ls -d libcxx-*)/include"
-  '' + stdenv.lib.optionalString stdenv.isDarwin ''
-    export TRIPLE=x86_64-apple-darwin
-  '' + stdenv.lib.optionalString stdenv.hostPlatform.isMusl ''
-    patch -p1 -d $(ls -d libcxx-*) -i ${../libcxx-0001-musl-hacks.patch}
-    patch -p1 -d $(ls -d libcxx-*) -i ${../libcxx-max_align_t.patch}
-  '';
-
-  installPhase = if stdenv.isDarwin
-    then ''
-      for file in lib/*.dylib; do
-        # this should be done in CMake, but having trouble figuring out
-        # the magic combination of necessary CMake variables
-        # if you fancy a try, take a look at
-        # http://www.cmake.org/Wiki/CMake_RPATH_handling
-        install_name_tool -id $out/$file $file
-      done
-      make install
-      install -d 755 $out/include
-      install -m 644 ../include/*.h $out/include
-    ''
-    else ''
-      install -d -m 755 $out/include $out/lib
-      install -m 644 lib/libc++abi.so.1.0 $out/lib
-      install -m 644 ../include/cxxabi.h $out/include
-      ln -s libc++abi.so.1.0 $out/lib/libc++abi.so
-      ln -s libc++abi.so.1.0 $out/lib/libc++abi.so.1
-    '';
-
-  meta = {
-    homepage = http://libcxxabi.llvm.org/;
-    description = "A new implementation of low level support for a standard C++ library";
-    license = with stdenv.lib.licenses; [ ncsa mit ];
-    maintainers = with stdenv.lib.maintainers; [ vlstill ];
-    platforms = stdenv.lib.platforms.unix;
-  };
-}
diff --git a/pkgs/development/compilers/llvm/3.8/lldb.nix b/pkgs/development/compilers/llvm/3.8/lldb.nix
deleted file mode 100644
index d27786464c05..000000000000
--- a/pkgs/development/compilers/llvm/3.8/lldb.nix
+++ /dev/null
@@ -1,50 +0,0 @@
-{ stdenv
-, fetch
-, cmake
-, zlib
-, ncurses
-, swig
-, which
-, libedit
-, llvm
-, clang-unwrapped
-, python
-, version
-}:
-
-stdenv.mkDerivation {
-  name = "lldb-${version}";
-
-  src = fetch "lldb" "18z8vhfgh4m57hl66i83cp4d4mv3i86z2hjhbp5rvqs7d88li49l";
-
-  postUnpack = ''
-    # Hack around broken standalone builf as of 3.8
-    unpackFile ${llvm.src}
-    srcDir="$(ls -d lldb-*.src)"
-    mkdir -p "$srcDir/tools/lib/Support"
-    cp "$(ls -d llvm-*.src)/lib/Support/regex_impl.h" "$srcDir/tools/lib/Support/"
-  '';
-
-  buildInputs = [ cmake python which swig ncurses zlib libedit llvm ];
-
-  hardeningDisable = [ "format" ];
-
-  cmakeFlags = [
-    "-DLLDB_PATH_TO_LLVM_BUILD=${llvm}"
-    "-DLLVM_MAIN_INCLUDE_DIR=${llvm}/include"
-    "-DLLDB_PATH_TO_CLANG_BUILD=${clang-unwrapped}"
-    "-DCLANG_MAIN_INCLUDE_DIR=${clang-unwrapped}/include"
-    "-DPYTHON_VERSION_MAJOR=2"
-    "-DPYTHON_VERSION_MINOR=7"
-    "-DLLDB_DISABLE_LIBEDIT=1" # https://llvm.org/bugs/show_bug.cgi?id=28898
-  ];
-
-  enableParallelBuilding = true;
-
-  meta = {
-    description = "A next-generation high-performance debugger";
-    homepage    = http://llvm.org/;
-    license     = stdenv.lib.licenses.ncsa;
-    platforms   = stdenv.lib.platforms.all;
-  };
-}
diff --git a/pkgs/development/compilers/llvm/3.8/llvm.nix b/pkgs/development/compilers/llvm/3.8/llvm.nix
deleted file mode 100644
index a73b73137ddc..000000000000
--- a/pkgs/development/compilers/llvm/3.8/llvm.nix
+++ /dev/null
@@ -1,115 +0,0 @@
-{ stdenv
-, fetch
-, fetchpatch
-, perl
-, groff
-, cmake
-, python
-, libffi
-, libbfd
-, libxml2
-, ncurses
-, version
-, zlib
-, compiler-rt_src
-, debugVersion ? false
-, enableSharedLibraries ? true
-}:
-
-stdenv.mkDerivation rec {
-  name = "llvm-${version}";
-
-  src = fetch "llvm" "1ybmnid4pw2hxn12ax5qa5kl1ldfns0njg8533y3mzslvd5cx0kf";
-
-  unpackPhase = ''
-    unpackFile $src
-    mv llvm-${version}.src llvm
-    sourceRoot=$PWD/llvm
-    unpackFile ${compiler-rt_src}
-    mv compiler-rt-* $sourceRoot/projects/compiler-rt
-  '';
-
-  buildInputs = [ perl groff cmake libxml2 python libffi ];
-
-  propagatedBuildInputs = [ ncurses zlib ];
-
-  # Fix a segfault in llc
-  # See http://lists.llvm.org/pipermail/llvm-dev/2016-October/106500.html
-  patches = [ ./D17533-1.patch ]
-   ++ stdenv.lib.optional (!stdenv.isDarwin) ./fix-llvm-config.patch
-   ++ stdenv.lib.optionals stdenv.hostPlatform.isMusl [
-     ../TLI-musl.patch
-     ../dynamiclibrary-musl.patch
-   ];
-
-  # hacky fix: New LLVM releases require a newer macOS SDK than
-  # 10.9. This is a temporary measure until nixpkgs darwin support is
-  # updated.
-  postPatch = stdenv.lib.optionalString stdenv.isDarwin ''
-    sed -i 's/os_trace(\(.*\)");$/printf(\1\\n");/g' ./projects/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
-
-    substituteInPlace CMakeLists.txt \
-      --replace 'set(CMAKE_INSTALL_NAME_DIR "@rpath")' "set(CMAKE_INSTALL_NAME_DIR "$out/lib")" \
-      --replace 'set(CMAKE_INSTALL_RPATH "@executable_path/../lib")' ""
-  ''
-  + ''
-    (
-      cd projects/compiler-rt
-      patch -p1 < ${
-        fetchpatch {
-          name = "sigaltstack.patch"; # for glibc-2.26
-          url = https://github.com/llvm-mirror/compiler-rt/commit/8a5e425a68d.diff;
-          sha256 = "0h4y5vl74qaa7dl54b1fcyqalvlpd8zban2d1jxfkxpzyi7m8ifi";
-        }
-      }
-    )
-  '';
-
-  # hacky fix: created binaries need to be run before installation
-  preBuild = ''
-    mkdir -p $out/
-    ln -sv $PWD/lib $out
-  '';
-
-  cmakeFlags = with stdenv; [
-    "-DCMAKE_BUILD_TYPE=${if debugVersion then "Debug" else "Release"}"
-    "-DLLVM_INSTALL_UTILS=ON"  # Needed by rustc
-    "-DLLVM_BUILD_TESTS=ON"
-    "-DLLVM_ENABLE_FFI=ON"
-    "-DLLVM_ENABLE_RTTI=ON"
-
-    "-DLLVM_HOST_TRIPLE=${stdenv.hostPlatform.config}"
-    "-DLLVM_DEFAULT_TARGET_TRIPLE=${stdenv.hostPlatform.config}"
-    "-DTARGET_TRIPLE=${stdenv.hostPlatform.config}"
-  ] ++ stdenv.lib.optional enableSharedLibraries [
-    "-DLLVM_LINK_LLVM_DYLIB=ON"
-  ] ++ stdenv.lib.optional (!isDarwin)
-    "-DLLVM_BINUTILS_INCDIR=${libbfd.dev}/include"
-    ++ stdenv.lib.optionals ( isDarwin) [
-    "-DLLVM_ENABLE_LIBCXX=ON"
-    "-DCAN_TARGET_i386=false"
-  ] ++ stdenv.lib.optionals stdenv.hostPlatform.isMusl [
-    # Not yet supported
-    "-DCOMPILER_RT_BUILD_SANITIZERS=OFF"
-    "-DCOMPILER_RT_BUILD_XRAY=OFF"
-
-  ];
-
-  postBuild = ''
-    rm -fR $out
-  '';
-
-  postInstall = stdenv.lib.optionalString (stdenv.isDarwin && enableSharedLibraries) ''
-    ln -s $out/lib/libLLVM.dylib $out/lib/libLLVM-${version}.dylib
-  '';
-
-  enableParallelBuilding = true;
-
-  meta = {
-    description = "Collection of modular and reusable compiler and toolchain technologies";
-    homepage    = http://llvm.org/;
-    license     = stdenv.lib.licenses.ncsa;
-    maintainers = with stdenv.lib.maintainers; [ lovek323 raskin ];
-    platforms   = stdenv.lib.platforms.all;
-  };
-}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 3164266ff6ec..82a940b5d381 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7405,7 +7405,6 @@ in
   clang_5  = llvmPackages_5.clang;
   clang_4  = llvmPackages_4.clang;
   clang_39 = llvmPackages_39.clang;
-  clang_38 = llvmPackages_38.clang;
   clang_35 = wrapCC llvmPackages_35.clang;
 
   clang-tools = callPackage ../development/tools/clang-tools {
@@ -8108,7 +8107,6 @@ in
   llvm_5  = llvmPackages_5.llvm;
   llvm_4  = llvmPackages_4.llvm;
   llvm_39 = llvmPackages_39.llvm;
-  llvm_38 = llvmPackages_38.llvm;
   llvm_35 = llvmPackages_35.llvm;
 
   llvmPackages = recurseIntoAttrs llvmPackages_7;
@@ -8119,14 +8117,6 @@ in
     stdenv = gcc6Stdenv;
   });
 
-  llvmPackages_38 = callPackage ../development/compilers/llvm/3.8 ({
-    inherit (stdenvAdapters) overrideCC;
-    buildLlvmTools = buildPackages.llvmPackages_38.tools;
-    targetLlvmLibraries = targetPackages.llvmPackages_38.libraries;
-  } // stdenv.lib.optionalAttrs (stdenv.cc.isGNU && stdenv.hostPlatform.isi686) {
-    stdenv = gcc6Stdenv;
-  });
-
   llvmPackages_39 = callPackage ../development/compilers/llvm/3.9 ({
     inherit (stdenvAdapters) overrideCC;
     buildLlvmTools = buildPackages.llvmPackages_39.tools;