338 строки
12 KiB
Plaintext
338 строки
12 KiB
Plaintext
# Copyright (c) 2013 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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import("//build/config/sanitizers/sanitizers.gni")
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import("//build/toolchain/toolchain.gni")
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# This value will be inherited in the toolchain below.
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concurrent_links = exec_script("get_concurrent_links.py", [], "value")
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# This template defines a toolchain for something that works like gcc
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# (including clang).
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#
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# It requires the following variables specifying the executables to run:
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# - cc
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# - cxx
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# - ar
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# - ld
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# and the following which is used in the toolchain_args
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# - toolchain_cpu (What "current_cpu" should be set to when invoking a
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# build using this toolchain.)
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# - toolchain_os (What "current_os" should be set to when invoking a
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# build using this toolchain.)
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#
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# Optional parameters that control the tools:
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#
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# - libs_section_prefix
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# - libs_section_postfix
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# The contents of these strings, if specified, will be placed around
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# the libs section of the linker line. It allows one to inject libraries
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# at the beginning and end for all targets in a toolchain.
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# - solink_libs_section_prefix
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# - solink_libs_section_postfix
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# Same as libs_section_{pre,post}fix except used for solink instead of link.
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# - link_outputs
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# The content of this array, if specified, will be added to the list of
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# outputs from the link command. This can be useful in conjunction with
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# the post_link parameter.
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# - post_link
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# The content of this string, if specified, will be run as a separate
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# command following the the link command.
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# - deps
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# Just forwarded to the toolchain definition.
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# - executable_extension
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# If this string is specified it will be used for the file extension
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# for an executable, rather than using no extension; targets will
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# still be able to override the extension using the output_extension
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# variable.
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# - rebuild_define
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# The contents of this string, if specified, will be passed as a #define
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# to the toolchain. It can be used to force recompiles whenever a
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# toolchain is updated.
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# - shlib_extension
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# If this string is specified it will be used for the file extension
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# for a shared library, rather than default value specified in
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# toolchain.gni
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# - strip
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# Location of the strip executable. When specified, strip will be run on
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# all shared libraries and executables as they are built. The pre-stripped
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# artifacts will be put in lib.stripped/ and exe.stripped/.
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#
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# Optional build argument contols.
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#
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# - clear_sanitizers
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# When set to true, is_asan, is_msan, etc.will all be set to false. Often
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# secondary toolchains do not want to run with sanitizers.
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# - is_clang
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# Whether to use clang instead of gcc.
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# - is_component_build
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# Whether to forcibly enable or disable component builds for this
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# toolchain; if not specified, the toolchain will inherit the
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# default setting.
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template("gcc_toolchain") {
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toolchain(target_name) {
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assert(defined(invoker.cc), "gcc_toolchain() must specify a \"cc\" value")
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assert(defined(invoker.cxx), "gcc_toolchain() must specify a \"cxx\" value")
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assert(defined(invoker.ar), "gcc_toolchain() must specify a \"ar\" value")
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assert(defined(invoker.ld), "gcc_toolchain() must specify a \"ld\" value")
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assert(defined(invoker.toolchain_cpu),
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"gcc_toolchain() must specify a \"toolchain_cpu\"")
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assert(defined(invoker.toolchain_os),
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"gcc_toolchain() must specify a \"toolchain_os\"")
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# This define changes when the toolchain changes, forcing a rebuild.
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# Nothing should ever use this define.
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if (defined(invoker.rebuild_define)) {
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rebuild_string = "-D" + invoker.rebuild_define + " "
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} else {
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rebuild_string = ""
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}
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# We can't do string interpolation ($ in strings) on things with dots in
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# them. To allow us to use $cc below, for example, we create copies of
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# these values in our scope.
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cc = invoker.cc
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cxx = invoker.cxx
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ar = invoker.ar
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ld = invoker.ld
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if (defined(invoker.readelf)) {
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readelf = invoker.readelf
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} else {
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readelf = "readelf"
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}
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if (defined(invoker.nm)) {
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nm = invoker.nm
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} else {
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nm = "nm"
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}
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if (defined(invoker.shlib_extension)) {
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default_shlib_extension = invoker.shlib_extension
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} else {
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default_shlib_extension = shlib_extension
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}
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if (defined(invoker.executable_extension)) {
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default_executable_extension = invoker.executable_extension
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} else {
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default_executable_extension = ""
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}
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# Bring these into our scope for string interpolation with default values.
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if (defined(invoker.libs_section_prefix)) {
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libs_section_prefix = invoker.libs_section_prefix
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} else {
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libs_section_prefix = ""
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}
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if (defined(invoker.libs_section_postfix)) {
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libs_section_postfix = invoker.libs_section_postfix
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} else {
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libs_section_postfix = ""
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}
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if (defined(invoker.solink_libs_section_prefix)) {
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solink_libs_section_prefix = invoker.solink_libs_section_prefix
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} else {
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solink_libs_section_prefix = ""
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}
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if (defined(invoker.solink_libs_section_postfix)) {
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solink_libs_section_postfix = invoker.solink_libs_section_postfix
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} else {
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solink_libs_section_postfix = ""
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}
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# These library switches can apply to all tools below.
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lib_switch = "-l"
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lib_dir_switch = "-L"
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tool("cc") {
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depfile = "{{output}}.d"
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command = "$cc -MMD -MF $depfile ${rebuild_string}{{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} -c {{source}} -o {{output}}"
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depsformat = "gcc"
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description = "CC {{output}}"
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outputs = [
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"{{target_out_dir}}/{{target_output_name}}/{{source_name_part}}.o",
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]
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}
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tool("cxx") {
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depfile = "{{output}}.d"
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command = "$cxx -MMD -MF $depfile ${rebuild_string}{{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} -c {{source}} -o {{output}}"
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depsformat = "gcc"
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description = "CXX {{output}}"
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outputs = [
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"{{target_out_dir}}/{{target_output_name}}/{{source_name_part}}.o",
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]
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}
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tool("asm") {
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# For GCC we can just use the C compiler to compile assembly.
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depfile = "{{output}}.d"
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command = "$cc -MMD -MF $depfile ${rebuild_string}{{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} -c {{source}} -o {{output}}"
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depsformat = "gcc"
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description = "ASM {{output}}"
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outputs = [
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"{{target_out_dir}}/{{target_output_name}}/{{source_name_part}}.o",
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]
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}
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tool("alink") {
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rspfile = "{{output}}.rsp"
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arflags = ""
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if (is_cfi && invoker.toolchain_os != "nacl") {
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gold_plugin_path = rebase_path(
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"//third_party/llvm-build/Release+Asserts/lib/LLVMgold.so",
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root_build_dir)
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arflags = "--plugin $gold_plugin_path"
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}
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command = "rm -f {{output}} && $ar rcs $arflags {{output}} @$rspfile"
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description = "AR {{output}}"
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rspfile_content = "{{inputs}}"
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outputs = [
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"{{target_out_dir}}/{{target_output_name}}{{output_extension}}",
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]
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default_output_extension = ".a"
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output_prefix = "lib"
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}
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tool("solink") {
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soname = "{{target_output_name}}{{output_extension}}" # e.g. "libfoo.so".
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sofile = "{{root_out_dir}}/$soname" # Possibly including toolchain dir.
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if (shlib_subdir != ".") {
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sofile = "{{root_out_dir}}/$shlib_subdir/$soname"
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}
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rspfile = sofile + ".rsp"
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unstripped_sofile = sofile
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if (defined(invoker.strip)) {
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unstripped_sofile = "{{root_out_dir}}/lib.unstripped/$soname"
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}
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# These variables are not built into GN but are helpers that implement
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# (1) linking to produce a .so, (2) extracting the symbols from that file
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# to a temporary file, (3) if the temporary file has differences from the
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# existing .TOC file, overwrite it, otherwise, don't change it.
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tocfile = sofile + ".TOC"
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temporary_tocname = sofile + ".tmp"
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link_command = "$ld -shared {{ldflags}} -o $unstripped_sofile -Wl,-soname=$soname @$rspfile"
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assert(defined(readelf), "to solink you must have a readelf")
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assert(defined(nm), "to solink you must have an nm")
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toc_command = "{ $readelf -d $unstripped_sofile | grep SONAME ; $nm -gD -f p $unstripped_sofile | cut -f1-2 -d' '; } > $temporary_tocname"
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replace_command = "if ! cmp -s $temporary_tocname $tocfile; then mv $temporary_tocname $tocfile; fi"
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command = "$link_command && $toc_command && $replace_command"
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if (defined(invoker.strip)) {
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strip_command =
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"${invoker.strip} --strip-unneeded -o $sofile $unstripped_sofile"
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command += " && " + strip_command
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}
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rspfile_content = "-Wl,--whole-archive {{inputs}} {{solibs}} -Wl,--no-whole-archive $solink_libs_section_prefix {{libs}} $solink_libs_section_postfix"
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description = "SOLINK $sofile"
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# Use this for {{output_extension}} expansions unless a target manually
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# overrides it (in which case {{output_extension}} will be what the target
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# specifies).
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default_output_extension = default_shlib_extension
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output_prefix = "lib"
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# Since the above commands only updates the .TOC file when it changes, ask
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# Ninja to check if the timestamp actually changed to know if downstream
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# dependencies should be recompiled.
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restat = true
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# Tell GN about the output files. It will link to the sofile but use the
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# tocfile for dependency management.
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outputs = [
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sofile,
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tocfile,
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]
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if (sofile != unstripped_sofile) {
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outputs += [ unstripped_sofile ]
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}
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link_output = sofile
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depend_output = tocfile
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}
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tool("link") {
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exename = "{{target_output_name}}{{output_extension}}"
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outfile = "{{root_out_dir}}/$exename"
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rspfile = "$outfile.rsp"
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unstripped_outfile = outfile
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# Use this for {{output_extension}} expansions unless a target manually
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# overrides it (in which case {{output_extension}} will be what the target
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# specifies).
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default_output_extension = default_executable_extension
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if (defined(invoker.strip)) {
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unstripped_outfile = "{{root_out_dir}}/exe.unstripped/$exename"
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}
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command = "$ld {{ldflags}} -o $unstripped_outfile -Wl,--start-group @$rspfile {{solibs}} -Wl,--end-group $libs_section_prefix {{libs}} $libs_section_postfix"
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if (defined(invoker.strip)) {
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strip_command =
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"${invoker.strip} --strip-unneeded -o $outfile $unstripped_outfile"
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command += " && " + strip_command
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}
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if (defined(invoker.postlink)) {
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command += " && " + invoker.postlink
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}
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description = "LINK $outfile"
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rspfile_content = "{{inputs}}"
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outputs = [
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outfile,
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]
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if (outfile != unstripped_outfile) {
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outputs += [ unstripped_outfile ]
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}
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if (defined(invoker.link_outputs)) {
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outputs += invoker.link_outputs
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}
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}
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tool("stamp") {
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command = "touch {{output}}"
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description = "STAMP {{output}}"
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}
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tool("copy") {
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command = "ln -f {{source}} {{output}} 2>/dev/null || (rm -rf {{output}} && cp -af {{source}} {{output}})"
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description = "COPY {{source}} {{output}}"
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}
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# When invoking this toolchain not as the default one, these args will be
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# passed to the build. They are ignored when this is the default toolchain.
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toolchain_args() {
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current_cpu = invoker.toolchain_cpu
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current_os = invoker.toolchain_os
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# These values need to be passed through unchanged.
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target_os = target_os
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target_cpu = target_cpu
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forward_variables_from(invoker,
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[
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"is_clang",
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"is_component_build",
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])
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if (defined(invoker.clear_sanitizers) && invoker.clear_sanitizers) {
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is_asan = false
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is_cfi = false
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is_lsan = false
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is_msan = false
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is_syzyasan = false
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is_tsan = false
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}
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}
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forward_variables_from(invoker, [ "deps" ])
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}
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}
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