[gn] move gn build into etc (#11577)

third_party/build_gn/BUILDCONFIG.gn

@@ -1,18 +0,0 @@
-# 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.
-
-if (target_os == "") {
-  target_os = host_os
-}
-if (target_cpu == "") {
-  target_cpu = host_cpu
-}
-if (current_cpu == "") {
-  current_cpu = target_cpu
-}
-if (current_os == "") {
-  current_os = target_os
-}
-
-set_default_toolchain("//third_party/build_gn/toolchain:gcc")

third_party/build_gn/README.md

@@ -1,22 +0,0 @@
-# build_gn
-
-## URL
-
-https://gn.googlesource.com/gn/+/refs/heads/master/examples/simple_build/build
-
-## License
-
-BSD 3-Clause
-
-## License File
-
-[LICENSE](https://gn.googlesource.com/gn/+/refs/heads/master/LICENSE)
-
-## Description
-
-gn is metabuild system that generates ninja files for further compilation 
-
-gn tool requires paths to all the toolchains to be used for compilation, for
-example compiler, linker etc. The toolchains in toolchain/BUILD.gn are from the
-examples repository for gn. BUILDCONFIG.gn is also trimmed down version from
-examples/simple_build/build/

third_party/build_gn/toolchain/BUILD.gn

@@ -1,74 +0,0 @@
-# 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.
-toolchain("gcc") {
-  tool("cc") {
-    depfile = "{{output}}.d"
-    command = "gcc -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} -c {{source}} -o {{output}}"
-    depsformat = "gcc"
-    description = "CC {{output}}"
-    outputs = [
-      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
-    ]
-  }
-  tool("cxx") {
-    depfile = "{{output}}.d"
-    command = "g++ -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} -c {{source}} -o {{output}}"
-    depsformat = "gcc"
-    description = "CXX {{output}}"
-    outputs = [
-      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
-    ]
-  }
-  tool("alink") {
-    rspfile = "{{output}}.rsp"
-    command = "rm -f {{output}} && ar rcs {{output}} @$rspfile"
-    description = "AR {{target_output_name}}{{output_extension}}"
-    rspfile_content = "{{inputs}}"
-    outputs = [
-      "{{target_out_dir}}/{{target_output_name}}{{output_extension}}",
-    ]
-    default_output_extension = ".a"
-    output_prefix = "lib"
-  }
-  tool("solink") {
-    soname = "{{target_output_name}}{{output_extension}}"  # e.g. "libfoo.so".
-    sofile = "{{output_dir}}/$soname"
-    rspfile = soname + ".rsp"
-    command = "g++ -shared {{ldflags}} -o $sofile -Wl,-soname=$soname @$rspfile"
-    rspfile_content = "-Wl,--whole-archive {{inputs}} {{solibs}} -Wl,--no-whole-archive {{libs}}"
-    description = "SOLINK $soname"
-    # Use this for {{output_extension}} expansions unless a target manually
-    # overrides it (in which case {{output_extension}} will be what the target
-    # specifies).
-    default_output_extension = ".so"
-    # Use this for {{output_dir}} expansions unless a target manually overrides
-    # it (in which case {{output_dir}} will be what the target specifies).
-    default_output_dir = "{{root_out_dir}}"
-    outputs = [
-      sofile,
-    ]
-    link_output = sofile
-    depend_output = sofile
-    output_prefix = "lib"
-  }
-  tool("link") {
-    outfile = "{{target_output_name}}{{output_extension}}"
-    rspfile = "$outfile.rsp"
-    command = "g++ {{ldflags}} -o $outfile -Wl,--start-group @$rspfile {{solibs}} -Wl,--end-group {{libs}}"
-    description = "LINK $outfile"
-    default_output_dir = "{{root_out_dir}}"
-    rspfile_content = "{{inputs}}"
-    outputs = [
-      outfile,
-    ]
-  }
-  tool("stamp") {
-    command = "touch {{output}}"
-    description = "STAMP {{output}}"
-  }
-  tool("copy") {
-    command = "cp -af {{source}} {{output}}"
-    description = "COPY {{source}} {{output}}"
-  }
-}