mimalloc: portability improvements (#415633)

let

  soext = stdenv.hostPlatform.extensions.sharedLibrary;

in

stdenv.mkDerivation rec {

stdenv.mkDerivation (finalAttrs: {

  pname = "mimalloc";

  version = "3.1.5";

  src = fetchFromGitHub {

    owner = "microsoft";

    repo = "mimalloc";

    rev = "v${version}";

    tag = "v${finalAttrs.version}";

    sha256 = "sha256-fk6nfyBFS1G0sJwUJVgTC1+aKd0We/JjsIYTO+IOfyg=";

  };

    cmake

    ninja

  ];

  cmakeFlags = [

    "-DMI_INSTALL_TOPLEVEL=ON"

  ]

  ++ lib.optionals secureBuild [ "-DMI_SECURE=ON" ]

  ++ lib.optionals stdenv.hostPlatform.isStatic [ "-DMI_BUILD_SHARED=OFF" ]

  ++ lib.optionals (!doCheck) [ "-DMI_BUILD_TESTS=OFF" ];

  cmakeFlags = lib.mapAttrsToList lib.cmakeBool {

    MI_INSTALL_TOPLEVEL = true;

    MI_SECURE = secureBuild;

    MI_BUILD_SHARED = stdenv.hostPlatform.hasSharedLibraries;

    MI_LIBC_MUSL = stdenv.hostPlatform.libc == "musl";

    MI_BUILD_TESTS = finalAttrs.doCheck;

    # MI_OPT_ARCH is inaccurate (e.g. it assumes aarch64 == armv8.1-a).

    # Nixpkgs's native platform configuration does a better job.

    MI_NO_OPT_ARCH = true;

  };

  postPatch = ''

    substituteInPlace cmake/mimalloc-config.cmake \

      --replace-fail 'string(REPLACE "/lib/cmake" "/lib" MIMALLOC_LIBRARY_DIR "''${MIMALLOC_CMAKE_DIR}")' \

                     "set(MIMALLOC_LIBRARY_DIR \"$out/lib\")" \

      --replace-fail 'string(REPLACE "/lib/cmake/" "/lib/" MIMALLOC_OBJECT_DIR "''${CMAKE_CURRENT_LIST_DIR}")' \

                     "set(MIMALLOC_OBJECT_DIR \"$out/lib\")"

  '';

  postInstall =

    let

      rel = lib.versions.majorMinor version;

      rel = lib.versions.majorMinor finalAttrs.version;

      suffix = if stdenv.hostPlatform.isLinux then "${soext}.${rel}" else ".${rel}${soext}";

    in

    ''

      thoughtpolice

    ];

  };

}

})