Add third_party/elfutils:libelf to the gn build.

third_party/elfutils/BUILD.gn

+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+config("libelf_config") {
+  include_dirs = [ "src/libelf" ]
+}
+
+source_set("libelf") {
+  sources = [
+    "config.h",
+
+    "src/libelf/abstract.h",
+    "src/libelf/common.h",
+    "src/libelf/dl-hash.h",
+    "src/libelf/elf.h",
+    "src/libelf/elf-knowledge.h",
+    "src/libelf/exttypes.h",
+    "src/libelf/gelf.h",
+    "src/libelf/gelf_xlate.h",
+    "src/libelf/gnuhash_xlate.h",
+    "src/libelf/libelf.h",
+    "src/libelf/libelfP.h",
+    "src/libelf/nlist.h",
+    "src/libelf/note_xlate.h",
+    "src/libelf/version_xlate.h",
+
+    "src/libelf/elf32_checksum.c",
+    "src/libelf/elf32_fsize.c",
+    "src/libelf/elf32_getehdr.c",
+    "src/libelf/elf32_getphdr.c",
+    "src/libelf/elf32_getshdr.c",
+    "src/libelf/elf32_newehdr.c",
+    "src/libelf/elf32_newphdr.c",
+    "src/libelf/elf32_offscn.c",
+    "src/libelf/elf32_updatefile.c",
+    "src/libelf/elf32_updatenull.c",
+    "src/libelf/elf32_xlatetof.c",
+    "src/libelf/elf32_xlatetom.c",
+    "src/libelf/elf64_checksum.c",
+    "src/libelf/elf64_fsize.c",
+    "src/libelf/elf64_getehdr.c",
+    "src/libelf/elf64_getphdr.c",
+    "src/libelf/elf64_getshdr.c",
+    "src/libelf/elf64_newehdr.c",
+    "src/libelf/elf64_newphdr.c",
+    "src/libelf/elf64_offscn.c",
+    "src/libelf/elf64_updatefile.c",
+    "src/libelf/elf64_updatenull.c",
+    "src/libelf/elf64_xlatetof.c",
+    "src/libelf/elf64_xlatetom.c",
+    "src/libelf/elf_begin.c",
+    "src/libelf/elf_clone.c",
+    "src/libelf/elf_cntl.c",
+    "src/libelf/elf_end.c",
+    "src/libelf/elf_error.c",
+    "src/libelf/elf_fill.c",
+    "src/libelf/elf_flagdata.c",
+    "src/libelf/elf_flagehdr.c",
+    "src/libelf/elf_flagelf.c",
+    "src/libelf/elf_flagphdr.c",
+    "src/libelf/elf_flagscn.c",
+    "src/libelf/elf_flagshdr.c",
+    "src/libelf/elf_getarhdr.c",
+    "src/libelf/elf_getaroff.c",
+    "src/libelf/elf_getarsym.c",
+    "src/libelf/elf_getbase.c",
+    "src/libelf/elf_getdata.c",
+    "src/libelf/elf_getdata_rawchunk.c",
+    "src/libelf/elf_getident.c",
+    "src/libelf/elf_getphdrnum.c",
+    "src/libelf/elf_getscn.c",
+    "src/libelf/elf_getshdrnum.c",
+    "src/libelf/elf_getshdrstrndx.c",
+    "src/libelf/elf_gnu_hash.c",
+    "src/libelf/elf_hash.c",
+    "src/libelf/elf_kind.c",
+    "src/libelf/elf_memory.c",
+    "src/libelf/elf_ndxscn.c",
+    "src/libelf/elf_newdata.c",
+    "src/libelf/elf_newscn.c",
+    "src/libelf/elf_next.c",
+    "src/libelf/elf_nextscn.c",
+    "src/libelf/elf_rand.c",
+    "src/libelf/elf_rawdata.c",
+    "src/libelf/elf_rawfile.c",
+    "src/libelf/elf_readall.c",
+    "src/libelf/elf_scnshndx.c",
+    "src/libelf/elf_strptr.c",
+    "src/libelf/elf_update.c",
+    "src/libelf/elf_version.c",
+    "src/libelf/gelf_checksum.c",
+    "src/libelf/gelf_fsize.c",
+    "src/libelf/gelf_getauxv.c",
+    "src/libelf/gelf_getclass.c",
+    "src/libelf/gelf_getdyn.c",
+    "src/libelf/gelf_getehdr.c",
+    "src/libelf/gelf_getlib.c",
+    "src/libelf/gelf_getmove.c",
+    "src/libelf/gelf_getnote.c",
+    "src/libelf/gelf_getphdr.c",
+    "src/libelf/gelf_getrela.c",
+    "src/libelf/gelf_getrel.c",
+    "src/libelf/gelf_getshdr.c",
+    "src/libelf/gelf_getsym.c",
+    "src/libelf/gelf_getsyminfo.c",
+    "src/libelf/gelf_getsymshndx.c",
+    "src/libelf/gelf_getverdaux.c",
+    "src/libelf/gelf_getverdef.c",
+    "src/libelf/gelf_getvernaux.c",
+    "src/libelf/gelf_getverneed.c",
+    "src/libelf/gelf_getversym.c",
+    "src/libelf/gelf_newehdr.c",
+    "src/libelf/gelf_newphdr.c",
+    "src/libelf/gelf_offscn.c",
+    "src/libelf/gelf_update_auxv.c",
+    "src/libelf/gelf_update_dyn.c",
+    "src/libelf/gelf_update_ehdr.c",
+    "src/libelf/gelf_update_lib.c",
+    "src/libelf/gelf_update_move.c",
+    "src/libelf/gelf_update_phdr.c",
+    "src/libelf/gelf_update_rela.c",
+    "src/libelf/gelf_update_rel.c",
+    "src/libelf/gelf_update_shdr.c",
+    "src/libelf/gelf_update_sym.c",
+    "src/libelf/gelf_update_syminfo.c",
+    "src/libelf/gelf_update_symshndx.c",
+    "src/libelf/gelf_update_verdaux.c",
+    "src/libelf/gelf_update_verdef.c",
+    "src/libelf/gelf_update_vernaux.c",
+    "src/libelf/gelf_update_verneed.c",
+    "src/libelf/gelf_update_versym.c",
+    "src/libelf/gelf_xlate.c",
+    "src/libelf/gelf_xlatetof.c",
+    "src/libelf/gelf_xlatetom.c",
+    "src/libelf/libelf_crc32.c",
+    "src/libelf/libelf_next_prime.c",
+    "src/libelf/nlist.c",
+  ]
+
+  include_dirs = [
+    ".",
+    "src/libelf",

[brettw, 2014/10/10 17:48:04]

You don't need this one since it's in the public config (which also applies to
this target).

[simonb (inactive), 2014/10/10 18:00:47]

Done.

+    "src/lib",
+  ]
+
+  defines = [
+    "_GNU_SOURCE",
+    "HAVE_CONFIG_H",
+  ]
+
+  cflags = [
+    "-std=gnu99",
+    "-Wall",
+    "-Wshadow",
+    "-Werror",
+    "-Wunused",
+    "-Wextra",
+    "-Wformat=2",
+  ]
+
+  public_configs = [ ":libelf_config" ]
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+}