# Copyright 2020 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import("//build/unification/global_variables.gni")

# The `linker` global variable indicates which linker is used to build
# binaries, the following values are supported:
#
#  - "lld": For the Clang linker
#  - "gold": For the Gold linker, used when building with GCC.
#  - "": For the default linker associated with the current compiler, e.g.
#      this will be the BFD linker when using GCC.
#
if (current_os == "mac") {
  # Only the native host linker works for macOS.
  linker = ""
} else if (is_gcc) {
  # Assume ld.gold is available for any native Linux host, and for any ELF
  # cross-compile target.  Use Gold for userland, and BFD ld for kernel.
  if (current_os == "linux" ||
      ((current_cpu != host_cpu || current_os != host_os) && !is_kernel &&
       current_os != "win")) {
    linker = "gold"
  } else {
    # For GCC on non-ELF hosts, use the system default linker.
    linker = ""
  }
} else {
  # Always use lld with Clang.
  linker = "lld"
}