{
  lib,
  stdenv,
  gccStdenv,
  gcc7Stdenv,
  callPackage,
  isl_0_11,
  isl_0_14,
  isl_0_17,
  isl_0_20,
  libcCross,
  threadsCrossFor,
  noSysDirs,
  texinfo5,
  cloog_0_18_0,
  cloog,
  lowPrio,
  wrapCC,
}@args:

let
  versions = import ./versions.nix;
  gccForMajorMinorVersion =
    majorMinorVersion:
    let
      atLeast = lib.versionAtLeast majorMinorVersion;
      attrName = "gcc${lib.replaceStrings [ "." ] [ "" ] majorMinorVersion}";
      pkg = lowPrio (
        wrapCC (
          callPackage ./default.nix (
            {
              inherit noSysDirs;
              inherit majorMinorVersion;
              reproducibleBuild = true;
              profiledCompiler = false;
              libcCross = if stdenv.targetPlatform != stdenv.buildPlatform then args.libcCross else null;
              threadsCross =
                if stdenv.targetPlatform != stdenv.buildPlatform then threadsCrossFor majorMinorVersion else { };
              isl =
                if stdenv.isDarwin then
                  null
                else if atLeast "9" then
                  isl_0_20
                else if atLeast "7" then
                  isl_0_17
                else if atLeast "6" then
                  (if stdenv.targetPlatform.isRedox then isl_0_17 else isl_0_14)
                else if atLeast "4.9" then
                  isl_0_11
                # "4.8"
                else
                  isl_0_14;
            }
            // lib.optionalAttrs (majorMinorVersion == "4.8") {
              texinfo = texinfo5; # doesn't validate since 6.1 -> 6.3 bump
            }
            // lib.optionalAttrs (!(atLeast "6")) {
              cloog =
                if stdenv.isDarwin then
                  null
                else if atLeast "4.9" then
                  cloog_0_18_0
                # 4.8
                else
                  cloog;
            }
            // lib.optionalAttrs (atLeast "6" && !(atLeast "9")) {
              # gcc 10 is too strict to cross compile gcc <= 8
              stdenv =
                if (stdenv.targetPlatform != stdenv.buildPlatform) && stdenv.cc.isGNU then gcc7Stdenv else stdenv;
            }
          )
        )
      );
    in
    lib.nameValuePair attrName pkg;
in
lib.listToAttrs (map gccForMajorMinorVersion versions.allMajorVersions)