Squashed 'third_party/immer/' content from commit ad3e3556d

git-subtree-dir: third_party/immer
git-subtree-split: ad3e3556d38bb75966dd24c61a774970a7c7957e

shell.nix

@@ -0,0 +1,65 @@
+{ toolchain ? "",
+  nixpkgs ? (import <nixpkgs> {}).fetchFromGitHub {
+    owner  = "NixOS";
+    repo   = "nixpkgs";
+    rev    = "053ad4e0db7241ae6a02394d62750fdc5d64aa9f";
+    sha256 = "11l9sr8zg8j1n5p43zjkqwpj59gn8c84z1kf16icnsbnv2smzqdc";
+  }}:
+
+with import nixpkgs {};
+
+let
+  # For the documentation tools we use an older Nixpkgs since the
+  # newer versions seem to be not working great...
+  oldNixpkgsSrc = fetchFromGitHub {
+                    owner  = "NixOS";
+                    repo   = "nixpkgs";
+                    rev    = "d0d905668c010b65795b57afdf7f0360aac6245b";
+                    sha256 = "1kqxfmsik1s1jsmim20n5l4kq6wq8743h5h17igfxxbbwwqry88l";
+                  };
+  oldNixpkgs    = import oldNixpkgsSrc {};
+  docs          = import ./nix/docs.nix { nixpkgs = oldNixpkgsSrc; };
+  benchmarks    = import ./nix/benchmarks.nix { inherit nixpkgs; };
+  tc            =
+    if toolchain == ""        then { stdenv = stdenv; cc = stdenv.cc; } else
+    if toolchain == "gnu-6"   then { stdenv = gcc6Stdenv; cc = gcc6; } else
+    if toolchain == "gnu-7"   then { stdenv = gcc7Stdenv; cc = gcc7; } else
+    if toolchain == "gnu-8"   then { stdenv = gcc8Stdenv; cc = gcc8; } else
+    if toolchain == "gnu-9"   then { stdenv = gcc9Stdenv; cc = gcc9; } else
+    if toolchain == "llvm-39" then { stdenv = llvmPackages_39.libcxxStdenv; cc = llvmPackages_39.libcxxClang; } else
+    if toolchain == "llvm-4"  then { stdenv = llvmPackages_4.libcxxStdenv; cc = llvmPackages_4.libcxxClang; } else
+    if toolchain == "llvm-5"  then { stdenv = llvmPackages_5.libcxxStdenv; cc = llvmPackages_5.libcxxClang; } else
+    if toolchain == "llvm-6"  then { stdenv = llvmPackages_6.libcxxStdenv; cc = llvmPackages_6.libcxxClang; } else
+    if toolchain == "llvm-7"  then { stdenv = llvmPackages_7.libcxxStdenv; cc = llvmPackages_7.libcxxClang; } else
+    if toolchain == "llvm-8"  then { stdenv = llvmPackages_8.libcxxStdenv; cc = llvmPackages_8.libcxxClang; } else
+    if toolchain == "llvm-9"  then { stdenv = llvmPackages_9.stdenv; cc = llvmPackages_9.clang; } else
+    abort "unknown toolchain";
+
+in
+tc.stdenv.mkDerivation rec {
+  name = "immer-env";
+  buildInputs = [
+    tc.cc
+    git
+    cmake
+    pkgconfig
+    ninja
+    gdb
+    lldb
+    ccache
+    boost
+    boehmgc
+    benchmarks.c_rrb
+    benchmarks.steady
+    benchmarks.chunkedseq
+    benchmarks.immutable_cpp
+    benchmarks.hash_trie
+    oldNixpkgs.doxygen
+    (oldNixpkgs.python.withPackages (ps: [
+      ps.sphinx
+      docs.breathe
+      docs.recommonmark
+    ]))
+  ];
+  hardeningDisable = [ "fortify" ];
+}