Revert "Re-land sksl fragment processor support"

This reverts commit c070939fd1a954b7a492bc30f0cf64a664b90181.

Reason for revert: 

This has some knock-on effects in the generation of Android.bp from our GN files.  See gn/gn_to_bp.py?  We're seeing things like "tmp/tmpsBVycx/gen/" end up in the include search path in Android.bp, which obviously don't exist there...

Original change's description:
> Re-land sksl fragment processor support
> 
> This reverts commit ed50200682e0de72c3abecaa4d5324ebcd1ed9f9.
> 
> Bug: skia:
> Change-Id: I9caa7454b391450620d6989dc472abb3cf7a2cab
> Reviewed-on: https://skia-review.googlesource.com/20965
> Reviewed-by: Ben Wagner <benjaminwagner@google.com>
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

TBR=benjaminwagner@google.com,ethannicholas@google.com

Change-Id: I502486b5405923b322429219f4cc396a45a14cea
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/20990
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>

6 files changed, 280 insertions, 344 deletions

diff --git a/gn/BUILD.gn b/gn/BUILD.gn
index d275bd6685..fdd50b1a11 100644
--- a/gn/BUILD.gn
+++ b/gn/BUILD.gn
@@ -4,14 +4,48 @@
 # found in the LICENSE file.
 
 declare_args() {
+  ar = "ar"
+  cc = "cc"
+  cxx = "c++"
+
+  if (is_android) {
+    if (host_os == "win") {
+      ar = "$ndk/toolchains/$ndk_gccdir-4.9/prebuilt/$ndk_host/$ndk_target/bin/ar.exe"
+      cc = "$ndk/toolchains/llvm/prebuilt/$ndk_host/bin/clang.exe"
+      cxx = "$ndk/toolchains/llvm/prebuilt/$ndk_host/bin/clang++.exe"
+    } else {
+      ar = "$ndk/toolchains/$ndk_gccdir-4.9/prebuilt/$ndk_host/$ndk_target/bin/ar"
+      cc = "$ndk/toolchains/llvm/prebuilt/$ndk_host/bin/clang"
+      cxx = "$ndk/toolchains/llvm/prebuilt/$ndk_host/bin/clang++"
+    }
+  }
+
+  msvc = 2015
+
   extra_asmflags = []
   extra_cflags = []
   extra_cflags_c = []
   extra_cflags_cc = []
   extra_ldflags = []
 
+  cc_wrapper = ""
   malloc = ""
 }
+declare_args() {
+  if (msvc == 2015) {
+    windk = "C:/Program Files (x86)/Microsoft Visual Studio 14.0"
+  } else {
+    windk = "C:/Program Files (x86)/Microsoft Visual Studio/2017/Professional"
+  }
+}
+
+if (host_os == "win") {
+  python = "python.bat"
+  stamp = "cmd.exe /c echo >"
+} else {
+  python = "python"
+  stamp = "touch"
+}
 
 is_clang = is_android || is_ios || is_mac || (cc == "clang" && cxx == "clang++")
 if (!is_clang && !is_win) {
@@ -439,3 +473,247 @@ config("executable") {
     ]
   }
 }
+
+toolchain("msvc") {
+  lib_dir_switch = "/LIBPATH:"
+
+  if (msvc == 2015) {
+    bin = "$windk/VC/bin/amd64"
+    env_setup = ""
+    if (target_cpu == "x86") {
+      bin += "_x86"
+      env_setup = "cmd /c $windk/win_sdk/bin/SetEnv.cmd /x86 && "
+    }
+  } else {
+    bin = "$windk/VC/Tools/MSVC/14.10.25017/bin/HostX64/$target_cpu"
+    env_setup = ""
+    if (target_cpu == "x86") {
+      print("Be sure to run")
+      print("$windk/VC/Auxiliary/Build/vcvarsall.bat amd64_x86")
+      print("to set up your environment before running ninja.")
+    }
+  }
+
+  tool("asm") {
+    _ml = "ml"
+    if (target_cpu == "x64") {
+      _ml += "64"
+    }
+    command = "$env_setup$bin/$_ml.exe /nologo /c /Fo {{output}} {{source}}"
+    outputs = [
+      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.obj",
+    ]
+    description = "assemble {{source}}"
+  }
+
+  tool("cc") {
+    rspfile = "{{output}}.rsp"
+    precompiled_header_type = "msvc"
+    pdbname = "{{target_out_dir}}/{{label_name}}_c.pdb"
+
+    # Label names may have spaces so pdbname must be quoted.
+    command = "$env_setup$bin/cl.exe /nologo /showIncludes /FC @$rspfile /c {{source}} /Fo{{output}} /Fd\"$pdbname\""
+    depsformat = "msvc"
+    outputs = [
+      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.obj",
+    ]
+    rspfile_content = "{{defines}} {{include_dirs}} {{cflags}} {{cflags_c}}"
+    description = "compile {{source}}"
+  }
+
+  tool("cxx") {
+    rspfile = "{{output}}.rsp"
+    precompiled_header_type = "msvc"
+    pdbname = "{{target_out_dir}}/{{label_name}}_c.pdb"
+
+    # Label names may have spaces so pdbname must be quoted.
+    command = "$env_setup$bin/cl.exe /nologo /showIncludes /FC @$rspfile /c {{source}} /Fo{{output}} /Fd\"$pdbname\""
+    depsformat = "msvc"
+    outputs = [
+      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.obj",
+    ]
+    rspfile_content = "{{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}}"
+    description = "compile {{source}}"
+  }
+
+  tool("alink") {
+    rspfile = "{{output}}.rsp"
+
+    command = "$env_setup$bin/lib.exe /nologo /ignore:4221 {{arflags}} /OUT:{{output}} @$rspfile"
+    outputs = [
+      # Ignore {{output_extension}} and always use .lib, there's no reason to
+      # allow targets to override this extension on Windows.
+      "{{root_out_dir}}/{{target_output_name}}{{output_extension}}",
+    ]
+    default_output_extension = ".lib"
+    default_output_dir = "{{target_out_dir}}"
+
+    # inputs_newline works around a fixed per-line buffer size in the linker.
+    rspfile_content = "{{inputs_newline}}"
+    description = "link {{output}}"
+  }
+
+  tool("solink") {
+    dllname = "{{output_dir}}/{{target_output_name}}{{output_extension}}"
+    libname = "${dllname}.lib"
+    pdbname = "${dllname}.pdb"
+    rspfile = "${dllname}.rsp"
+
+    command = "$env_setup$bin/link.exe /nologo /IMPLIB:$libname /DLL /OUT:$dllname /PDB:$pdbname @$rspfile"
+    outputs = [
+      dllname,
+      libname,
+      pdbname,
+    ]
+    default_output_extension = ".dll"
+    default_output_dir = "{{root_out_dir}}"
+
+    link_output = libname
+    depend_output = libname
+    runtime_outputs = [
+      dllname,
+      pdbname,
+    ]
+
+    # I don't quite understand this.  Aping Chrome's toolchain/win/BUILD.gn.
+    restat = true
+
+    # inputs_newline works around a fixed per-line buffer size in the linker.
+    rspfile_content = "{{inputs_newline}} {{libs}} {{solibs}} {{ldflags}}"
+    description = "link {{output}}"
+  }
+
+  tool("link") {
+    exename = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}"
+    pdbname = "$exename.pdb"
+    rspfile = "$exename.rsp"
+
+    command =
+        "$env_setup$bin/link.exe /nologo /OUT:$exename /PDB:$pdbname @$rspfile"
+
+    default_output_extension = ".exe"
+    default_output_dir = "{{root_out_dir}}"
+    outputs = [
+      exename,
+    ]
+
+    # inputs_newline works around a fixed per-line buffer size in the linker.
+    rspfile_content = "{{inputs_newline}} {{libs}} {{solibs}} {{ldflags}}"
+    description = "link {{output}}"
+  }
+
+  tool("stamp") {
+    command = "$stamp {{output}}"
+    description = "stamp {{output}}"
+  }
+
+  tool("copy") {
+    cp_py = rebase_path("cp.py")
+    command = "$python $cp_py {{source}} {{output}}"
+    description = "copy {{source}} {{output}}"
+  }
+}
+
+toolchain("gcc_like") {
+  lib_switch = "-l"
+  lib_dir_switch = "-L"
+
+  tool("cc") {
+    depfile = "{{output}}.d"
+    command = "$cc_wrapper $cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} -c {{source}} -o {{output}}"
+    depsformat = "gcc"
+    outputs = [
+      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
+    ]
+    description = "compile {{source}}"
+  }
+
+  tool("cxx") {
+    depfile = "{{output}}.d"
+    command = "$cc_wrapper $cxx -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} -c {{source}} -o {{output}}"
+    depsformat = "gcc"
+    outputs = [
+      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
+    ]
+    description = "compile {{source}}"
+  }
+
+  tool("objc") {
+    depfile = "{{output}}.d"
+    command = "$cc_wrapper $cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_objc}} -c {{source}} -o {{output}}"
+    depsformat = "gcc"
+    outputs = [
+      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
+    ]
+    description = "compile {{source}}"
+  }
+
+  tool("objcxx") {
+    depfile = "{{output}}.d"
+    command = "$cc_wrapper $cxx -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} {{cflags_objc}} -c {{source}} -o {{output}}"
+    depsformat = "gcc"
+    outputs = [
+      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
+    ]
+    description = "compile {{source}}"
+  }
+
+  tool("asm") {
+    depfile = "{{output}}.d"
+    command = "$cc_wrapper $cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{asmflags}} -c {{source}} -o {{output}}"
+    depsformat = "gcc"
+    outputs = [
+      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
+    ]
+    description = "assemble {{source}}"
+  }
+
+  tool("alink") {
+    rspfile = "{{output}}.rsp"
+    rspfile_content = "{{inputs}}"
+    ar_py = rebase_path("ar.py")
+    command = "$python $ar_py $ar {{output}} $rspfile"
+    outputs = [
+      "{{root_out_dir}}/{{target_output_name}}{{output_extension}}",
+    ]
+    default_output_extension = ".a"
+    output_prefix = "lib"
+    description = "link {{output}}"
+  }
+
+  tool("solink") {
+    soname = "{{target_output_name}}{{output_extension}}"
+
+    rpath = "-Wl,-soname,$soname"
+    if (is_mac) {
+      rpath = "-Wl,-install_name,@rpath/$soname"
+    }
+
+    command = "$cc_wrapper $cxx -shared {{ldflags}} {{inputs}} {{solibs}} {{libs}} $rpath -o {{output}}"
+    outputs = [
+      "{{root_out_dir}}/$soname",
+    ]
+    output_prefix = "lib"
+    default_output_extension = ".so"
+    description = "link {{output}}"
+  }
+
+  tool("link") {
+    command = "$cc_wrapper $cxx {{ldflags}} {{inputs}} {{solibs}} {{libs}} -o {{output}}"
+    outputs = [
+      "{{root_out_dir}}/{{target_output_name}}{{output_extension}}",
+    ]
+    description = "link {{output}}"
+  }
+
+  tool("stamp") {
+    command = "$stamp {{output}}"
+    description = "stamp {{output}}"
+  }
+
+  tool("copy") {
+    cp_py = rebase_path("cp.py")
+    command = "$python $cp_py {{source}} {{output}}"
+    description = "copy {{source}} {{output}}"
+  }
+}
diff --git a/gn/BUILDCONFIG.gn b/gn/BUILDCONFIG.gn
index 43f66f8832..2b3ae33292 100644
--- a/gn/BUILDCONFIG.gn
+++ b/gn/BUILDCONFIG.gn
@@ -17,21 +17,9 @@ declare_args() {
     ndk_api = 21
   }
   sanitize = ""
-
-  ar = "ar"
-  cc = "cc"
-  cxx = "c++"
-
-  msvc = 2015
 }
 declare_args() {
   is_debug = !is_official_build
-
-  if (msvc == 2015) {
-    windk = "C:/Program Files (x86)/Microsoft Visual Studio 14.0"
-  } else {
-    windk = "C:/Program Files (x86)/Microsoft Visual Studio/2017/Professional"
-  }
 }
 
 assert(!(is_debug && is_official_build))
@@ -176,12 +164,8 @@ set_defaults("component") {
 
 if (is_win) {
   # Windows tool chain
-  set_default_toolchain("//gn/toolchain:msvc")
-  default_toolchain_name = "msvc"
-  host_toolchain = "msvc"
+  set_default_toolchain("//gn:msvc")
 } else {
   # GCC-like toolchains, including Clang.
-  set_default_toolchain("//gn/toolchain:gcc_like")
-  default_toolchain_name = "gcc_like"
-  host_toolchain = "gcc_like_host"
+  set_default_toolchain("//gn:gcc_like")
 }
diff --git a/gn/compile_processors.py b/gn/compile_processors.py
deleted file mode 100755
index 72f23febdd..0000000000
--- a/gn/compile_processors.py
+++ /dev/null
@@ -1,19 +0,0 @@
-#!/usr/bin/env python
-#
-# Copyright 2017 Google Inc.
-#
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import os
-import subprocess
-import sys
-
-skslc = sys.argv[1]
-dst = sys.argv[2]
-processors = sys.argv[3:]
-for p in processors:
-    path, _ = os.path.splitext(p)
-    filename = os.path.split(path)[1]
-    subprocess.check_call([skslc, p, os.path.join(dst, filename + ".h")])
-    subprocess.check_call([skslc, p, os.path.join(dst, filename + ".cpp")])
diff --git a/gn/sksl.gni b/gn/sksl.gni
index d13393025c..a1cab827ff 100644
--- a/gn/sksl.gni
+++ b/gn/sksl.gni
@@ -11,16 +11,11 @@ skia_sksl_sources = [
   "$_src/sksl/SkSLCompiler.cpp",
   "$_src/sksl/SkSLIRGenerator.cpp",
   "$_src/sksl/SkSLParser.cpp",
-  "$_src/sksl/SkSLCPPCodeGenerator.cpp",
-  "$_src/sksl/SkSLHCodeGenerator.cpp",
   "$_src/sksl/SkSLGLSLCodeGenerator.cpp",
   "$_src/sksl/SkSLSPIRVCodeGenerator.cpp",
   "$_src/sksl/SkSLString.cpp",
   "$_src/sksl/SkSLUtil.cpp",
   "$_src/sksl/lex.layout.cpp",
   "$_src/sksl/ir/SkSLSymbolTable.cpp",
-  "$_src/sksl/ir/SkSLSetting.cpp",
   "$_src/sksl/ir/SkSLType.cpp",
 ]
-
-skia_gpu_processor_sources = []
diff --git a/gn/tests.gni b/gn/tests.gni
index fde7df64eb..6843a6f555 100644
--- a/gn/tests.gni
+++ b/gn/tests.gni
@@ -216,7 +216,6 @@ tests_sources = [
   "$_tests/SkResourceCacheTest.cpp",
   "$_tests/SkSharedMutexTest.cpp",
   "$_tests/SkSLErrorTest.cpp",
-  "$_tests/SkSLFPTest.cpp",
   "$_tests/SkSLGLSLTest.cpp",
   "$_tests/SkSLMemoryLayoutTest.cpp",
   "$_tests/SkSLSPIRVTest.cpp",
diff --git a/gn/toolchain/BUILD.gn b/gn/toolchain/BUILD.gn
deleted file mode 100644
index a4c13a7d69..0000000000
--- a/gn/toolchain/BUILD.gn
+++ /dev/null
@@ -1,301 +0,0 @@
-declare_args() {
-  host_ar = ar
-  host_cc = cc
-  host_cxx = cxx
-
-  if (is_android) {
-    if (host_os == "win") {
-      target_ar = "$ndk/toolchains/$ndk_gccdir-4.9/prebuilt/$ndk_host/$ndk_target/bin/ar.exe"
-      target_cc = "$ndk/toolchains/llvm/prebuilt/$ndk_host/bin/clang.exe"
-      target_cxx = "$ndk/toolchains/llvm/prebuilt/$ndk_host/bin/clang++.exe"
-    } else {
-      target_ar = "$ndk/toolchains/$ndk_gccdir-4.9/prebuilt/$ndk_host/$ndk_target/bin/ar"
-      target_cc = "$ndk/toolchains/llvm/prebuilt/$ndk_host/bin/clang"
-      target_cxx = "$ndk/toolchains/llvm/prebuilt/$ndk_host/bin/clang++"
-    }
-  } else {
-    target_ar = ar
-    target_cc = cc
-    target_cxx = cxx
-  }
-
-  cc_wrapper = ""
-}
-
-if (host_os == "win") {
-  python = "python.bat"
-  stamp = "cmd.exe /c echo >"
-} else {
-  python = "python"
-  stamp = "touch"
-}
-
-toolchain("msvc") {
-  lib_dir_switch = "/LIBPATH:"
-
-  if (msvc == 2015) {
-    bin = "$windk/VC/bin/amd64"
-    env_setup = ""
-    if (target_cpu == "x86") {
-      bin += "_x86"
-      env_setup = "cmd /c $windk/win_sdk/bin/SetEnv.cmd /x86 && "
-    }
-  } else {
-    bin = "$windk/VC/Tools/MSVC/14.10.25017/bin/HostX64/$target_cpu"
-    env_setup = ""
-    if (target_cpu == "x86") {
-      print("Be sure to run")
-      print("$windk/VC/Auxiliary/Build/vcvarsall.bat amd64_x86")
-      print("to set up your environment before running ninja.")
-    }
-  }
-
-  tool("asm") {
-    _ml = "ml"
-    if (target_cpu == "x64") {
-      _ml += "64"
-    }
-    command = "$env_setup$bin/$_ml.exe /nologo /c /Fo {{output}} {{source}}"
-    outputs = [
-      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.obj",
-    ]
-    description = "assemble {{source}}"
-  }
-
-  tool("cc") {
-    rspfile = "{{output}}.rsp"
-    precompiled_header_type = "msvc"
-    pdbname = "{{target_out_dir}}/{{label_name}}_c.pdb"
-
-    # Label names may have spaces so pdbname must be quoted.
-    command = "$env_setup$bin/cl.exe /nologo /showIncludes /FC @$rspfile /c {{source}} /Fo{{output}} /Fd\"$pdbname\""
-    depsformat = "msvc"
-    outputs = [
-      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.obj",
-    ]
-    rspfile_content = "{{defines}} {{include_dirs}} {{cflags}} {{cflags_c}}"
-    description = "compile {{source}}"
-  }
-
-  tool("cxx") {
-    rspfile = "{{output}}.rsp"
-    precompiled_header_type = "msvc"
-    pdbname = "{{target_out_dir}}/{{label_name}}_c.pdb"
-
-    # Label names may have spaces so pdbname must be quoted.
-    command = "$env_setup$bin/cl.exe /nologo /showIncludes /FC @$rspfile /c {{source}} /Fo{{output}} /Fd\"$pdbname\""
-    depsformat = "msvc"
-    outputs = [
-      "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.obj",
-    ]
-    rspfile_content = "{{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}}"
-    description = "compile {{source}}"
-  }
-
-  tool("alink") {
-    rspfile = "{{output}}.rsp"
-
-    command = "$env_setup$bin/lib.exe /nologo /ignore:4221 {{arflags}} /OUT:{{output}} @$rspfile"
-    outputs = [
-      # Ignore {{output_extension}} and always use .lib, there's no reason to
-      # allow targets to override this extension on Windows.
-      "{{root_out_dir}}/{{target_output_name}}{{output_extension}}",
-    ]
-    default_output_extension = ".lib"
-    default_output_dir = "{{target_out_dir}}"
-
-    # inputs_newline works around a fixed per-line buffer size in the linker.
-    rspfile_content = "{{inputs_newline}}"
-    description = "link {{output}}"
-  }
-
-  tool("solink") {
-    dllname = "{{output_dir}}/{{target_output_name}}{{output_extension}}"
-    libname = "${dllname}.lib"
-    pdbname = "${dllname}.pdb"
-    rspfile = "${dllname}.rsp"
-
-    command = "$env_setup$bin/link.exe /nologo /IMPLIB:$libname /DLL /OUT:$dllname /PDB:$pdbname @$rspfile"
-    outputs = [
-      dllname,
-      libname,
-      pdbname,
-    ]
-    default_output_extension = ".dll"
-    default_output_dir = "{{root_out_dir}}"
-
-    link_output = libname
-    depend_output = libname
-    runtime_outputs = [
-      dllname,
-      pdbname,
-    ]
-
-    # I don't quite understand this.  Aping Chrome's toolchain/win/BUILD.gn.
-    restat = true
-
-    # inputs_newline works around a fixed per-line buffer size in the linker.
-    rspfile_content = "{{inputs_newline}} {{libs}} {{solibs}} {{ldflags}}"
-    description = "link {{output}}"
-  }
-
-  tool("link") {
-    exename = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}"
-    pdbname = "$exename.pdb"
-    rspfile = "$exename.rsp"
-
-    command =
-        "$env_setup$bin/link.exe /nologo /OUT:$exename /PDB:$pdbname @$rspfile"
-
-    default_output_extension = ".exe"
-    default_output_dir = "{{root_out_dir}}"
-    outputs = [
-      exename,
-    ]
-
-    # inputs_newline works around a fixed per-line buffer size in the linker.
-    rspfile_content = "{{inputs_newline}} {{libs}} {{solibs}} {{ldflags}}"
-    description = "link {{output}}"
-  }
-
-  tool("stamp") {
-    command = "$stamp {{output}}"
-    description = "stamp {{output}}"
-  }
-
-  tool("copy") {
-    cp_py = rebase_path("../cp.py")
-    command = "$python $cp_py {{source}} {{output}}"
-    description = "copy {{source}} {{output}}"
-  }
-}
-
-template("gcc_like_toolchain") {
-  toolchain(target_name) {
-    ar = invoker.ar
-    cc = invoker.cc
-    cxx = invoker.cxx
-    lib_switch = "-l"
-    lib_dir_switch = "-L"
-
-    tool("cc") {
-      depfile = "{{output}}.d"
-      command = "$cc_wrapper $cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} -c {{source}} -o {{output}}"
-      depsformat = "gcc"
-      outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
-      ]
-      description = "compile {{source}}"
-    }
-
-    tool("cxx") {
-      depfile = "{{output}}.d"
-      command = "$cc_wrapper $cxx -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} -c {{source}} -o {{output}}"
-      depsformat = "gcc"
-      outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
-      ]
-      description = "compile {{source}}"
-    }
-
-    tool("objc") {
-      depfile = "{{output}}.d"
-      command = "$cc_wrapper $cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_objc}} -c {{source}} -o {{output}}"
-      depsformat = "gcc"
-      outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
-      ]
-      description = "compile {{source}}"
-    }
-
-    tool("objcxx") {
-      depfile = "{{output}}.d"
-      command = "$cc_wrapper $cxx -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} {{cflags_objc}} -c {{source}} -o {{output}}"
-      depsformat = "gcc"
-      outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
-      ]
-      description = "compile {{source}}"
-    }
-
-    tool("asm") {
-      depfile = "{{output}}.d"
-      command = "$cc_wrapper $cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{asmflags}} -c {{source}} -o {{output}}"
-      depsformat = "gcc"
-      outputs = [
-        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o",
-      ]
-      description = "assemble {{source}}"
-    }
-
-    tool("alink") {
-      rspfile = "{{output}}.rsp"
-      rspfile_content = "{{inputs}}"
-      ar_py = rebase_path("../ar.py")
-      command = "$python $ar_py $ar {{output}} $rspfile"
-      outputs = [
-        "{{root_out_dir}}/{{target_output_name}}{{output_extension}}",
-      ]
-      default_output_extension = ".a"
-      output_prefix = "lib"
-      description = "link {{output}}"
-    }
-
-    tool("solink") {
-      soname = "{{target_output_name}}{{output_extension}}"
-
-      rpath = "-Wl,-soname,$soname"
-      if (is_mac) {
-        rpath = "-Wl,-install_name,@rpath/$soname"
-      }
-
-      command = "$cc_wrapper $cxx -shared {{ldflags}} {{inputs}} {{solibs}} {{libs}} $rpath -o {{output}}"
-      outputs = [
-        "{{root_out_dir}}/$soname",
-      ]
-      output_prefix = "lib"
-      default_output_extension = ".so"
-      description = "link {{output}}"
-    }
-
-    tool("link") {
-      command = "$cc_wrapper $cxx {{ldflags}} {{inputs}} {{solibs}} {{libs}} -o {{output}}"
-      outputs = [
-        "{{root_out_dir}}/{{target_output_name}}{{output_extension}}",
-      ]
-      description = "link {{output}}"
-    }
-
-    tool("stamp") {
-      command = "$stamp {{output}}"
-      description = "stamp {{output}}"
-    }
-
-    tool("copy") {
-      cp_py = rebase_path("../cp.py")
-      command = "$python $cp_py {{source}} {{output}}"
-      description = "copy {{source}} {{output}}"
-    }
-
-    toolchain_args = {
-      current_cpu = invoker.cpu
-      current_os = invoker.os
-    }
-  }
-}
-
-gcc_like_toolchain("gcc_like") {
-  cpu = current_cpu
-  os = current_os
-  ar = target_ar
-  cc = target_cc
-  cxx = target_cxx
-}
-
-gcc_like_toolchain("gcc_like_host") {
-  cpu = host_cpu
-  os = host_os
-  ar = host_ar
-  cc = host_cc
-  cxx = host_cxx
-}