| # Copyright (c) 2013 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. |
| |
| import("//build/config/clang/clang.gni") |
| import("//build/config/compiler/compiler.gni") |
| import("//build/config/coverage/coverage.gni") |
| import("//build/config/sanitizers/sanitizers.gni") |
| import("//build/config/v8_target_cpu.gni") |
| import("//build/toolchain/cc_wrapper.gni") |
| import("//build/toolchain/goma.gni") |
| import("//build/toolchain/rbe.gni") |
| import("//build/toolchain/toolchain.gni") |
| |
| if (is_nacl) { |
| # To keep NaCl variables out of builds that don't include NaCl, all |
| # variables defined in nacl/config.gni referenced here should be protected by |
| # is_nacl conditions. |
| import("//build/config/nacl/config.gni") |
| } |
| |
| declare_args() { |
| # Enables allowlist generation for IDR_ grit defines seen by the compiler. |
| # Currently works only on some platforms and enabled by default for official |
| # builds. Requires debug info. |
| enable_resource_allowlist_generation = |
| is_official_build && |
| # Don't enable for Android-on-Chrome OS so that they can build with |
| # symbol_level=0 without this failing (crbug.com/891164). |
| (target_os == "android" || target_os == "win") |
| } |
| |
| # When the arg is set via args.gn, it applies to all toolchains. In order to not |
| # hit the assert in grit_rule.gni, explicitly disable for host toolchains. |
| if ((is_linux || is_chromeos) && target_os == "android") { |
| enable_resource_allowlist_generation = false |
| } |
| |
| # Ensure enable_resource_allowlist_generation is enabled only when it will work. |
| if (enable_resource_allowlist_generation) { |
| assert(symbol_level >= 1, |
| "enable_resource_allowlist_generation=true requires symbol_level >= 1") |
| assert( |
| !strip_debug_info, |
| "enable_resource_allowlist_generation=true requires strip_debug_info=false") |
| assert( |
| !is_component_build, |
| "enable_resource_allowlist_generation=true requires is_component_build=false") |
| assert( |
| target_os == "android" || target_os == "win", |
| "enable_resource_allowlist_generation=true does not work for target_os=$target_os") |
| } |
| |
| # This template defines a toolchain for something that works like gcc |
| # (including clang). |
| # |
| # It requires the following variables specifying the executables to run: |
| # - ar |
| # - cc |
| # - cxx |
| # - ld |
| # |
| # Optional parameters that control the tools: |
| # |
| # - extra_cflags |
| # Extra flags to be appended when compiling C files (but not C++ files). |
| # - extra_cppflags |
| # Extra flags to be appended when compiling both C and C++ files. "CPP" |
| # stands for "C PreProcessor" in this context, although it can be |
| # used for non-preprocessor flags as well. Not to be confused with |
| # "CXX" (which follows). |
| # - extra_cxxflags |
| # Extra flags to be appended when compiling C++ files (but not C files). |
| # - extra_asmflags |
| # Extra flags to be appended when compiling assembly. |
| # - extra_ldflags |
| # Extra flags to be appended when linking |
| # |
| # - link_outputs |
| # The content of this array, if specified, will be added to the list of |
| # outputs from the link command. This can be useful in conjunction with |
| # the post_link parameter. |
| # - use_unstripped_as_runtime_outputs |
| # When |strip| is set, mark unstripped executables as runtime deps rather |
| # than stripped ones. |
| # - post_link |
| # The content of this string, if specified, will be run as a separate |
| # command following the the link command. |
| # - deps |
| # Just forwarded to the toolchain definition. |
| # - executable_extension |
| # If this string is specified it will be used for the file extension |
| # for an executable, rather than using no extension; targets will |
| # still be able to override the extension using the output_extension |
| # variable. |
| # - rebuild_define |
| # The contents of this string, if specified, will be passed as a #define |
| # to the toolchain. It can be used to force recompiles whenever a |
| # toolchain is updated. |
| # - shlib_extension |
| # If this string is specified it will be used for the file extension |
| # for a shared library, rather than default value specified in |
| # toolchain.gni |
| # - strip |
| # Location of the strip executable. When specified, strip will be run on |
| # all shared libraries and executables as they are built. The pre-stripped |
| # artifacts will be put in lib.unstripped/ and exe.unstripped/. |
| # |
| # Optional parameters added with the Starboard platform: |
| # |
| # - tail_lib_dependencies |
| # If defined, this string will be added to the compilation line after all |
| # other libs are specified. |
| # - using_snarl_linker |
| # Defining this string will ensure static linker flags are passed in a way |
| # that the snarl tool will accept. |
| template("gcc_toolchain") { |
| toolchain(target_name) { |
| assert(defined(invoker.ar), "gcc_toolchain() must specify a \"ar\" value") |
| assert(defined(invoker.cc), "gcc_toolchain() must specify a \"cc\" value") |
| assert(defined(invoker.cxx), "gcc_toolchain() must specify a \"cxx\" value") |
| assert(defined(invoker.ld), "gcc_toolchain() must specify a \"ld\" value") |
| |
| # This define changes when the toolchain changes, forcing a rebuild. |
| # Nothing should ever use this define. |
| if (defined(invoker.rebuild_define)) { |
| rebuild_string = "-D" + invoker.rebuild_define + " " |
| } else { |
| rebuild_string = "" |
| } |
| |
| # GN's syntax can't handle more than one scope dereference at once, like |
| # "invoker.toolchain_args.foo", so make a temporary to hold the toolchain |
| # args so we can do "invoker_toolchain_args.foo". |
| assert(defined(invoker.toolchain_args), |
| "Toolchains must specify toolchain_args") |
| invoker_toolchain_args = invoker.toolchain_args |
| assert(is_starboard || defined(invoker_toolchain_args.current_cpu), |
| "toolchain_args must specify a current_cpu") |
| assert(is_starboard || defined(invoker_toolchain_args.current_os), |
| "toolchain_args must specify a current_os") |
| |
| # When invoking this toolchain not as the default one, these args will be |
| # passed to the build. They are ignored when this is the default toolchain. |
| toolchain_args = { |
| # Populate toolchain args from the invoker. |
| forward_variables_from(invoker_toolchain_args, "*") |
| |
| # The host toolchain value computed by the default toolchain's setup |
| # needs to be passed through unchanged to all secondary toolchains to |
| # ensure that it's always the same, regardless of the values that may be |
| # set on those toolchains. |
| if (!use_cobalt_customizations) { |
| host_toolchain = host_toolchain |
| |
| if (!defined(invoker_toolchain_args.v8_current_cpu)) { |
| v8_current_cpu = invoker_toolchain_args.current_cpu |
| } |
| } |
| } |
| |
| # When the invoker has explicitly overridden user_rbe, use_goma or |
| # cc_wrapper in the toolchain args, use those values, otherwise default |
| # to the global one. This works because the only reasonable override |
| # that toolchains might supply for these values are to force-disable them. |
| if (defined(toolchain_args.use_rbe)) { |
| toolchain_uses_rbe = toolchain_args.use_rbe |
| } else { |
| toolchain_uses_rbe = use_rbe |
| } |
| if (defined(toolchain_args.use_goma)) { |
| toolchain_uses_goma = toolchain_args.use_goma |
| } else { |
| toolchain_uses_goma = use_goma |
| } |
| |
| # x86_64-nacl-* is ELF-32 and Goma/RBE won't support ELF-32. |
| if (toolchain_uses_goma && |
| get_path_info(invoker.cc, "name") == "x86_64-nacl-gcc") { |
| # it will also disable x86_64-nacl-g++ since these are in |
| # the same toolchain. |
| toolchain_uses_goma = false |
| } |
| if (defined(toolchain_args.cc_wrapper)) { |
| toolchain_cc_wrapper = toolchain_args.cc_wrapper |
| } else { |
| toolchain_cc_wrapper = cc_wrapper |
| } |
| assert(!(toolchain_uses_rbe && toolchain_uses_goma), |
| "Goma and RBE can't be used together.") |
| assert(!(toolchain_cc_wrapper != "" && toolchain_uses_rbe), |
| "RBE and cc_wrapper can't be used together.") |
| assert(!(toolchain_cc_wrapper != "" && toolchain_uses_goma), |
| "Goma and cc_wrapper can't be used together.") |
| |
| # When the invoker has explicitly overridden use_goma or cc_wrapper in the |
| # toolchain args, use those values, otherwise default to the global one. |
| # This works because the only reasonable override that toolchains might |
| # supply for these values are to force-disable them. |
| # But if needs_gomacc_path_arg is set in a Chrome OS build, the toolchain |
| # wrapper will have picked up gomacc via cmd-line arg. So need to prepend |
| # gomacc in that case. |
| goma_path = "$goma_dir/gomacc" |
| if (toolchain_uses_rbe) { |
| if (defined(toolchain_args.rbe_cc_cfg_file)) { |
| toolchain_rbe_cc_cfg_file = toolchain_args.rbe_cc_cfg_file |
| } else { |
| toolchain_rbe_cc_cfg_file = rbe_cc_cfg_file |
| } |
| |
| # C/C++ (clang) rewrapper prefix to use when use_rbe is true. |
| compiler_prefix = "${rbe_bin_dir}/rewrapper -cfg=${toolchain_rbe_cc_cfg_file} -exec_root=${rbe_exec_root} " |
| } else if (toolchain_uses_goma && |
| (!defined(invoker_toolchain_args.needs_gomacc_path_arg) || |
| !invoker_toolchain_args.needs_gomacc_path_arg)) { |
| compiler_prefix = "${goma_path} " |
| } else { |
| compiler_prefix = "${toolchain_cc_wrapper} " |
| } |
| if (use_goma_thin_lto && toolchain_uses_goma && use_thin_lto) { |
| # goma_ld.py uses autoninja in an attempt to set a reasonable |
| # number of jobs, but this results in too low a value on |
| # Chrome OS builders. So we pass in an explicit value. |
| goma_ld = |
| "$python_path " + |
| rebase_path("//tools/clang/scripts/goma_ld.py", root_build_dir) + |
| " --gomacc ${goma_path} --jobs 200 -- " |
| } else { |
| goma_ld = "" |
| not_needed([ "goma_path" ]) |
| } |
| |
| # Create a distinct variable for "asm", since coverage runs pass a bunch of |
| # flags to clang/clang++ that are nonsensical on assembler runs. |
| asm_prefix = compiler_prefix |
| |
| # A specific toolchain may wish to avoid coverage instrumentation, so we |
| # allow the global "use_clang_coverage" arg to be overridden. |
| if (defined(toolchain_args.use_clang_coverage)) { |
| toolchain_use_clang_coverage = toolchain_args.use_clang_coverage |
| } else { |
| toolchain_use_clang_coverage = use_clang_coverage |
| } |
| |
| # For a coverage build, we use the wrapper script globally so that it can |
| # remove coverage cflags from files that should not have them. |
| if (toolchain_use_clang_coverage) { |
| # "coverage_instrumentation_input_file" is set in args.gn, but it can be |
| # overridden by a toolchain config. |
| if (defined(toolchain_args.coverage_instrumentation_input_file)) { |
| toolchain_coverage_instrumentation_input_file = |
| toolchain_args.coverage_instrumentation_input_file |
| } else { |
| toolchain_coverage_instrumentation_input_file = |
| coverage_instrumentation_input_file |
| } |
| |
| _coverage_wrapper = |
| rebase_path("//build/toolchain/clang_code_coverage_wrapper.py", |
| root_build_dir) |
| |
| # The wrapper needs to know what OS we target because it uses that to |
| # select a list of files that should not be instrumented. |
| _coverage_wrapper = _coverage_wrapper + " --target-os=" + target_os |
| |
| # We want to instrument everything if there is no input file set. |
| # If there is a file we need to give it to the wrapper script so it can |
| # instrument only those files. |
| if (toolchain_coverage_instrumentation_input_file != "") { |
| _coverage_wrapper = |
| _coverage_wrapper + " --files-to-instrument=" + |
| rebase_path(toolchain_coverage_instrumentation_input_file, |
| root_build_dir) |
| } |
| compiler_prefix = "$python_path ${_coverage_wrapper} " + compiler_prefix |
| } |
| |
| cc = "$compiler_prefix\"${invoker.cc}\"" |
| cxx = "$compiler_prefix\"${invoker.cxx}\"" |
| asm = "$asm_prefix\"${invoker.cc}\"" |
| ar = invoker.ar |
| ld = "$goma_ld${invoker.ld}" |
| if (defined(invoker.readelf)) { |
| readelf = invoker.readelf |
| } else { |
| readelf = "readelf" |
| } |
| if (defined(invoker.nm)) { |
| nm = invoker.nm |
| } else { |
| nm = "nm" |
| } |
| if (defined(invoker.dwp)) { |
| dwp_switch = " --dwp=\"${invoker.dwp}\"" |
| } else { |
| dwp_switch = "" |
| } |
| |
| if (defined(invoker.shlib_extension)) { |
| default_shlib_extension = invoker.shlib_extension |
| } else { |
| default_shlib_extension = shlib_extension |
| } |
| |
| if (defined(invoker.default_shlib_subdir)) { |
| default_shlib_subdir = invoker.default_shlib_subdir |
| } else { |
| default_shlib_subdir = "" |
| } |
| |
| if (defined(invoker.executable_extension)) { |
| default_executable_extension = invoker.executable_extension |
| } else { |
| default_executable_extension = "" |
| } |
| |
| # Bring these into our scope for string interpolation with default values. |
| if (defined(invoker.extra_cflags) && invoker.extra_cflags != "") { |
| extra_cflags = " " + invoker.extra_cflags |
| } else { |
| extra_cflags = "" |
| } |
| |
| if (defined(invoker.extra_cppflags) && invoker.extra_cppflags != "") { |
| extra_cppflags = " " + invoker.extra_cppflags |
| } else { |
| extra_cppflags = "" |
| } |
| |
| if (defined(invoker.extra_cxxflags) && invoker.extra_cxxflags != "") { |
| extra_cxxflags = " " + invoker.extra_cxxflags |
| } else { |
| extra_cxxflags = "" |
| } |
| |
| if (defined(invoker.extra_asmflags) && invoker.extra_asmflags != "") { |
| extra_asmflags = " " + invoker.extra_asmflags |
| } else { |
| extra_asmflags = "" |
| } |
| |
| if (defined(invoker.extra_ldflags) && invoker.extra_ldflags != "") { |
| extra_ldflags = " " + invoker.extra_ldflags |
| } else { |
| extra_ldflags = "" |
| } |
| |
| enable_linker_map = defined(invoker.enable_linker_map) && |
| invoker.enable_linker_map && generate_linker_map |
| |
| # These library switches can apply to all tools below. |
| lib_switch = "-l" |
| lib_dir_switch = "-L" |
| |
| # Object files go in this directory. |
| object_subdir = "{{target_out_dir}}/{{label_name}}" |
| |
| if (defined(invoker.tail_lib_dependencies)) { |
| tail_lib_dependencies = " " + invoker.tail_lib_dependencies |
| } else { |
| tail_lib_dependencies = "" |
| } |
| |
| tool("cc") { |
| depfile = "{{output}}.d" |
| precompiled_header_type = "gcc" |
| command = "$cc -MMD -MF $depfile ${rebuild_string}{{defines}} {{include_dirs}} {{cflags}} {{cflags_c}}${extra_cppflags}${extra_cflags} -c {{source}} -o {{output}}" |
| depsformat = "gcc" |
| description = "CC {{output}}" |
| outputs = [ "$object_subdir/{{source_name_part}}.o" ] |
| } |
| |
| tool("cxx") { |
| depfile = "{{output}}.d" |
| precompiled_header_type = "gcc" |
| command = "$cxx -MMD -MF $depfile ${rebuild_string}{{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}}${extra_cppflags}${extra_cxxflags} -c {{source}} -o {{output}}" |
| depsformat = "gcc" |
| description = "CXX {{output}}" |
| outputs = [ "$object_subdir/{{source_name_part}}.o" ] |
| } |
| |
| tool("asm") { |
| # For GCC we can just use the C compiler to compile assembly. |
| depfile = "{{output}}.d" |
| |
| # TODO(b/206642994): see if we can remove this condition. It's needed for |
| # now to add cflags for evergreen platforms but we haven't yet decided |
| # whether cflags should be added here for all platforms. |
| if (is_starboard && sb_is_evergreen) { |
| command = "$asm -MMD -MF $depfile ${rebuild_string}{{defines}} {{include_dirs}} {{cflags}} {{asmflags}}${extra_asmflags} -c {{source}} -o {{output}}" |
| } else { |
| command = "$asm -MMD -MF $depfile ${rebuild_string}{{defines}} {{include_dirs}} {{asmflags}}${extra_asmflags} -c {{source}} -o {{output}}" |
| } |
| |
| depsformat = "gcc" |
| description = "ASM {{output}}" |
| outputs = [ "$object_subdir/{{source_name_part}}.o" ] |
| } |
| |
| tool("alink") { |
| if (defined(invoker.using_snarl_linker) && invoker.using_snarl_linker) { |
| rspfile = "{{output}}.rsp" |
| rspfile_content = "{{inputs_newline}}" |
| command = "\"$ar\" {{arflags}} rcsD {{output}} @\"$rspfile\"" |
| } else if (current_os == "aix") { |
| # AIX does not support either -D (deterministic output) or response |
| # files. |
| command = "$ar -X64 {{arflags}} -r -c -s {{output}} {{inputs}}" |
| } else { |
| rspfile = "{{output}}.rsp" |
| rspfile_content = "{{inputs}}" |
| command = "\"$ar\" {{arflags}} -r -c -s -D {{output}} @\"$rspfile\"" |
| } |
| |
| # Remove the output file first so that ar doesn't try to modify the |
| # existing file. |
| if (host_os == "win") { |
| tool_wrapper_path = |
| rebase_path("//build/toolchain/win/tool_wrapper.py", root_build_dir) |
| command = "cmd /c $python_path $tool_wrapper_path delete-file {{output}} && $command" |
| } else { |
| command = "rm -f {{output}} && $command" |
| } |
| |
| # Almost all targets build with //build/config/compiler:thin_archive which |
| # adds -T to arflags. |
| description = "AR {{output}}" |
| outputs = [ "{{output_dir}}/{{target_output_name}}{{output_extension}}" ] |
| |
| # Shared libraries go in the target out directory by default so we can |
| # generate different targets with the same name and not have them collide. |
| default_output_dir = "{{target_out_dir}}" |
| default_output_extension = ".a" |
| output_prefix = "lib" |
| } |
| |
| tool("solink") { |
| soname = "{{target_output_name}}{{output_extension}}" # e.g. "libfoo.so". |
| sofile = "{{output_dir}}/$soname" # Possibly including toolchain dir. |
| rspfile = sofile + ".rsp" |
| pool = "//build/toolchain:link_pool($default_toolchain)" |
| |
| if (defined(invoker.strip)) { |
| unstripped_sofile = "{{root_out_dir}}/lib.unstripped/$soname" |
| } else { |
| unstripped_sofile = sofile |
| } |
| |
| # These variables are not built into GN but are helpers that |
| # implement (1) linking to produce a .so, (2) extracting the symbols |
| # from that file (3) if the extracted list differs from the existing |
| # .TOC file, overwrite it, otherwise, don't change it. |
| tocfile = sofile + ".TOC" |
| |
| # TODO(b/206642994): see if we can remove this condition. It's needed for |
| # now because we use the ld.lld linker for evergreen platforms and need to |
| # pass options as `option` instead of `-Wl,option`. |
| if (is_starboard && sb_is_evergreen) { |
| link_command = "$ld -shared -soname=\"$soname\" {{ldflags}}${extra_ldflags} -o \"$unstripped_sofile\" @\"$rspfile\"" |
| } else { |
| link_command = "$ld -shared -Wl,-soname=\"$soname\" {{ldflags}}${extra_ldflags} -o \"$unstripped_sofile\" @\"$rspfile\"" |
| } |
| |
| # Generate a map file to be used for binary size analysis. |
| # Map file adds ~10% to the link time on a z620. |
| # With target_os="android", libchrome.so.map.gz is ~20MB. |
| map_switch = "" |
| if (enable_linker_map) { |
| map_file = "$unstripped_sofile.map.gz" |
| map_switch = " --map-file \"$map_file\"" |
| } |
| |
| assert(defined(readelf), "to solink you must have a readelf") |
| assert(defined(nm), "to solink you must have an nm") |
| strip_switch = "" |
| if (defined(invoker.strip)) { |
| strip_switch = "--strip=${invoker.strip} " |
| } |
| |
| # This needs a Python script to avoid using a complex shell command |
| # requiring sh control structures, pipelines, and POSIX utilities. |
| # The host might not have a POSIX shell and utilities (e.g. Windows). |
| solink_wrapper = |
| rebase_path("//build/toolchain/gcc_solink_wrapper.py", root_build_dir) |
| command = "$python_path \"$solink_wrapper\" --readelf=\"$readelf\" --nm=\"$nm\" $strip_switch$dwp_switch --sofile=\"$unstripped_sofile\" --tocfile=\"$tocfile\"$map_switch --output=\"$sofile\" -- $link_command" |
| |
| if (target_cpu == "mipsel" && is_component_build && is_android) { |
| rspfile_content = "-Wl,--start-group -Wl,--whole-archive {{inputs}} {{solibs}} -Wl,--no-whole-archive {{libs}} -Wl,--end-group$tail_lib_dependencies" |
| # TODO(b/206642994): see if we can remove this condition. It's needed for |
| # now because we use the ld.lld linker for evergreen platforms and need |
| # to pass options as `option` instead of `-Wl,option`. |
| } else if (is_starboard && sb_is_evergreen) { |
| rspfile_content = "--whole-archive {{inputs}} {{solibs}} --no-whole-archive {{libs}}$tail_lib_dependencies" |
| } else { |
| rspfile_content = "-Wl,--whole-archive {{inputs}} {{solibs}} -Wl,--no-whole-archive {{libs}}$tail_lib_dependencies" |
| } |
| |
| description = "SOLINK $sofile" |
| |
| # Use this for {{output_extension}} expansions unless a target manually |
| # overrides it (in which case {{output_extension}} will be what the target |
| # specifies). |
| default_output_extension = default_shlib_extension |
| |
| default_output_dir = "{{root_out_dir}}${default_shlib_subdir}" |
| |
| output_prefix = "lib" |
| |
| # Since the above commands only updates the .TOC file when it changes, ask |
| # Ninja to check if the timestamp actually changed to know if downstream |
| # dependencies should be recompiled. |
| restat = true |
| |
| # Tell GN about the output files. It will link to the sofile but use the |
| # tocfile for dependency management. |
| outputs = [ |
| sofile, |
| tocfile, |
| ] |
| if (sofile != unstripped_sofile) { |
| outputs += [ unstripped_sofile ] |
| if (defined(invoker.use_unstripped_as_runtime_outputs) && |
| invoker.use_unstripped_as_runtime_outputs) { |
| runtime_outputs = [ unstripped_sofile ] |
| } |
| } |
| |
| # Clank build will generate DWP files when Fission is used. |
| # Other builds generate DWP files outside of the gn link targets, if at |
| # all. |
| if (defined(invoker.dwp)) { |
| outputs += [ unstripped_sofile + ".dwp" ] |
| if (defined(invoker.use_unstripped_as_runtime_outputs) && |
| invoker.use_unstripped_as_runtime_outputs) { |
| runtime_outputs += [ unstripped_sofile + ".dwp" ] |
| } |
| } |
| if (defined(map_file)) { |
| outputs += [ map_file ] |
| } |
| link_output = sofile |
| depend_output = tocfile |
| } |
| |
| tool("solink_module") { |
| soname = "{{target_output_name}}{{output_extension}}" # e.g. "libfoo.so". |
| sofile = "{{output_dir}}/$soname" |
| rspfile = sofile + ".rsp" |
| pool = "//build/toolchain:link_pool($default_toolchain)" |
| |
| if (defined(invoker.strip)) { |
| unstripped_sofile = "{{root_out_dir}}/lib.unstripped/$soname" |
| } else { |
| unstripped_sofile = sofile |
| } |
| |
| command = "$ld -shared {{ldflags}}${extra_ldflags} -o \"$unstripped_sofile\" -Wl,-soname=\"$soname\" @\"$rspfile\"" |
| |
| if (defined(invoker.strip)) { |
| strip_command = "${invoker.strip} -o \"$sofile\" \"$unstripped_sofile\"" |
| command += " && " + strip_command |
| } |
| rspfile_content = "-Wl,--whole-archive {{inputs}} {{solibs}} -Wl,--no-whole-archive {{libs}}$tail_lib_dependencies" |
| |
| description = "SOLINK_MODULE $sofile" |
| |
| # Use this for {{output_extension}} expansions unless a target manually |
| # overrides it (in which case {{output_extension}} will be what the target |
| # specifies). |
| if (defined(invoker.loadable_module_extension)) { |
| default_output_extension = invoker.loadable_module_extension |
| } else { |
| default_output_extension = default_shlib_extension |
| } |
| |
| default_output_dir = "{{root_out_dir}}${default_shlib_subdir}" |
| |
| output_prefix = "lib" |
| |
| outputs = [ sofile ] |
| if (sofile != unstripped_sofile) { |
| outputs += [ unstripped_sofile ] |
| if (defined(invoker.use_unstripped_as_runtime_outputs) && |
| invoker.use_unstripped_as_runtime_outputs) { |
| runtime_outputs = [ unstripped_sofile ] |
| } |
| } |
| } |
| |
| tool("link") { |
| exename = "{{target_output_name}}{{output_extension}}" |
| outfile = "{{output_dir}}/$exename" |
| rspfile = "$outfile.rsp" |
| unstripped_outfile = outfile |
| pool = "//build/toolchain:link_pool($default_toolchain)" |
| |
| # Use this for {{output_extension}} expansions unless a target manually |
| # overrides it (in which case {{output_extension}} will be what the target |
| # specifies). |
| default_output_extension = default_executable_extension |
| |
| default_output_dir = "{{root_out_dir}}" |
| |
| if (defined(invoker.strip)) { |
| unstripped_outfile = "{{root_out_dir}}/exe.unstripped/$exename" |
| } |
| |
| start_group_flag = "" |
| end_group_flag = "" |
| if (current_os != "aix") { |
| # the "--start-group .. --end-group" feature isn't available on the aix ld. |
| start_group_flag = "-Wl,--start-group" |
| end_group_flag = "-Wl,--end-group " |
| } |
| |
| if (using_old_compiler) { |
| link_command = "$ld {{ldflags}}${extra_ldflags} -o \"$unstripped_outfile\" $start_group_flag @\"$rspfile\" {{solibs}} $end_group_flag {{libs}} $tail_lib_dependencies" |
| } else { |
| link_command = "$ld {{ldflags}}${extra_ldflags} {{libs}} -o \"$unstripped_outfile\" $start_group_flag @\"$rspfile\" {{solibs}} $end_group_flag$tail_lib_dependencies" |
| } |
| |
| # Generate a map file to be used for binary size analysis. |
| # Map file adds ~10% to the link time on a z620. |
| # With target_os="android", libchrome.so.map.gz is ~20MB. |
| map_switch = "" |
| if (enable_linker_map) { |
| map_file = "$unstripped_outfile.map.gz" |
| map_switch = " --map-file \"$map_file\"" |
| } |
| |
| strip_switch = "" |
| if (defined(invoker.strip)) { |
| strip_switch = " --strip=\"${invoker.strip}\" --unstripped-file=\"$unstripped_outfile\"" |
| } |
| |
| link_wrapper = |
| rebase_path("//build/toolchain/gcc_link_wrapper.py", root_build_dir) |
| command = "$python_path \"$link_wrapper\" --output=\"$outfile\"$strip_switch$map_switch$dwp_switch -- $link_command" |
| |
| description = "LINK $outfile" |
| rspfile_content = "{{inputs}}" |
| outputs = [ outfile ] |
| if (outfile != unstripped_outfile) { |
| outputs += [ unstripped_outfile ] |
| if (defined(invoker.use_unstripped_as_runtime_outputs) && |
| invoker.use_unstripped_as_runtime_outputs) { |
| runtime_outputs = [ unstripped_outfile ] |
| } |
| } |
| |
| # Clank build will generate DWP files when Fission is used. |
| # Other builds generate DWP files outside of the gn link targets, if at |
| # all. |
| if (defined(invoker.dwp)) { |
| outputs += [ unstripped_outfile + ".dwp" ] |
| if (defined(invoker.use_unstripped_as_runtime_outputs) && |
| invoker.use_unstripped_as_runtime_outputs) { |
| runtime_outputs += [ unstripped_outfile + ".dwp" ] |
| } |
| } |
| if (defined(invoker.link_outputs)) { |
| outputs += invoker.link_outputs |
| } |
| if (defined(map_file)) { |
| outputs += [ map_file ] |
| } |
| } |
| |
| # These two are really entirely generic, but have to be repeated in |
| # each toolchain because GN doesn't allow a template to be used here. |
| # See //build/toolchain/toolchain.gni for details. |
| tool("stamp") { |
| command = stamp_command |
| description = stamp_description |
| } |
| tool("copy") { |
| command = copy_command |
| description = copy_description |
| } |
| |
| tool("action") { |
| pool = "//build/toolchain:action_pool($default_toolchain)" |
| } |
| |
| forward_variables_from(invoker, [ "deps" ]) |
| } |
| } |
| |
| # This is a shorthand for gcc_toolchain instances based on the Chromium-built |
| # version of Clang. Only the toolchain_cpu and toolchain_os variables need to |
| # be specified by the invoker, and optionally toolprefix if it's a |
| # cross-compile case. Note that for a cross-compile case this toolchain |
| # requires a config to pass the appropriate -target option, or else it will |
| # actually just be doing a native compile. The invoker can optionally override |
| # use_gold too. |
| template("clang_toolchain") { |
| if (defined(invoker.toolprefix)) { |
| toolprefix = invoker.toolprefix |
| } else { |
| toolprefix = "" |
| } |
| if (is_starboard) { |
| clang_base_path = invoker.clang_base_path |
| } |
| |
| gcc_toolchain(target_name) { |
| prefix = rebase_path("$clang_base_path/bin", root_build_dir) |
| cc = "$prefix/clang" |
| cxx = "$prefix/clang++" |
| ld = cxx |
| readelf = "${toolprefix}readelf" |
| ar = "${prefix}/llvm-ar" |
| nm = "nm" |
| |
| forward_variables_from(invoker, |
| [ |
| "strip", |
| "default_shlib_subdir", |
| "enable_linker_map", |
| "use_unstripped_as_runtime_outputs", |
| ]) |
| |
| toolchain_args = { |
| if (defined(invoker.toolchain_args)) { |
| forward_variables_from(invoker.toolchain_args, "*") |
| } |
| is_clang = true |
| } |
| } |
| } |
