gn: Drop NaCl gcc-newlib toolchains

build/toolchain/nacl/BUILD.gn

 # Copyright (c) 2014 The Native Client 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/config/sysroot.gni")
 import("//build/toolchain/nacl_toolchain.gni")
 
 nacl_toolchain_dir = rebase_path("//native_client/toolchain", root_build_dir)
 os_toolchain_dir = "${nacl_toolchain_dir}/${current_os}_x86"
 
 # Add the toolchain revision as a preprocessor define so that sources are
 # rebuilt when a toolchain is updated.
 # Idea we could use the toolchain deps feature, but currently that feature is
 # bugged and does not trigger a rebuild.
 # https://code.google.com/p/chromium/issues/detail?id=431880
 # Calls to get the toolchain revision are relatively slow, so do them all in a
 # single batch to amortize python startup, etc.
 revisions = exec_script("//native_client/build/get_toolchain_revision.py",
                         [
-                          "nacl_arm_newlib",
-                          "nacl_x86_newlib",
                           "nacl_x86_glibc",
                           "pnacl_newlib",
                         ],
                         "trim list lines")
-nacl_arm_newlib_rev = revisions[0]
-nacl_x86_newlib_rev = revisions[1]
-nacl_x86_glibc_rev = revisions[2]
-pnacl_newlib_rev = revisions[3]
-
-nacl_toolchain("newlib_arm") {
-  toolchain_package = "nacl_arm_newlib"
-  toolchain_revision = nacl_arm_newlib_rev
-  toolchain_cpu = "arm"
-  toolprefix = "${os_toolchain_dir}/${toolchain_package}/bin/arm-nacl-"
-  is_clang = false
-
-  cc = toolprefix + "gcc"
-  cxx = toolprefix + "g++"
-  ar = toolprefix + "ar"
-  ld = cxx
-}
-
-nacl_toolchain("newlib_x86") {
-  toolchain_package = "nacl_x86_newlib"
-  toolchain_revision = nacl_x86_newlib_rev
-  toolchain_cpu = "x86"
-  toolprefix = "${os_toolchain_dir}/${toolchain_package}/bin/i686-nacl-"
-  is_clang = false
-
-  cc = toolprefix + "gcc"
-  cxx = toolprefix + "g++"
-  ar = toolprefix + "ar"
-  ld = cxx
-}
-
-nacl_toolchain("newlib_x64") {
-  toolchain_package = "nacl_x86_newlib"
-  toolchain_revision = nacl_x86_newlib_rev
-  toolchain_cpu = "x64"
-  toolprefix = "${os_toolchain_dir}/${toolchain_package}/bin/x86_64-nacl-"
-  is_clang = false
-
-  cc = toolprefix + "gcc"
-  cxx = toolprefix + "g++"
-  ar = toolprefix + "ar"
-  ld = cxx
-}
+nacl_x86_glibc_rev = revisions[0]
+pnacl_newlib_rev = revisions[1]
 
 nacl_toolchain("newlib_pnacl") {
   toolchain_package = "pnacl_newlib"
   toolchain_revision = pnacl_newlib_rev
   toolchain_cpu = "pnacl"
   toolprefix = "${os_toolchain_dir}/${toolchain_package}/bin/pnacl-"
 
   cc = toolprefix + "clang"
   cxx = toolprefix + "clang++"
   ar = toolprefix + "ar"
@@ skipping 100 matching lines @@
   toolchain_tuple = "i686-nacl"
 }
 
 nacl_irt_toolchain("x64") {
   toolchain_tuple = "x86_64-nacl"
 }
 
 nacl_irt_toolchain("arm") {
   toolchain_tuple = "arm-nacl"
 }