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- # 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.
- # TODO(brettw) Use "gcc_toolchain.gni" like the Linux toolchains. This requires
- # some enhancements since the commands on Mac are slightly different than on
- # Linux.
- import("//build/config/apple/symbols.gni")
- import("//build/config/clang/clang.gni")
- import("//build/config/compiler/compiler.gni")
- import("//build/config/coverage/coverage.gni")
- import("//build/config/rust.gni")
- import("//build/toolchain/cc_wrapper.gni")
- import("//build/toolchain/goma.gni")
- import("//build/toolchain/rbe.gni")
- import("//build/toolchain/toolchain.gni")
- assert((target_os == "ios" && host_os == "mac") || host_os != "win")
- declare_args() {
- # This controls whether whole module optimization is enabled when building
- # Swift modules. If enabled, the compiler will compile the module as one
- # unit, generating just one single object file. Otherwise, it will generate
- # one object file per .swift file. If unspecified, will default to "true"
- # for official builds, and "false" for all other builds.
- swift_whole_module_optimization = -1
- }
- if (swift_whole_module_optimization == -1) {
- swift_whole_module_optimization = is_official_build
- }
- # When implementing tools using Python scripts, a TOOL_VERSION=N env
- # variable is placed in front of the command. The N should be incremented
- # whenever the script is changed, so that the build system rebuilds all
- # edges that utilize the script. Ideally this should be changed to use
- # proper input-dirty checking, but that could be expensive. Instead, use a
- # script to get the tool scripts' modification time to use as the version.
- # This won't cause a re-generation of GN files when the tool script changes
- # but it will cause edges to be marked as dirty if the ninja files are
- # regenerated. See https://crbug.com/619083 for details. A proper fix
- # would be to have inputs to tools (https://crbug.com/621119).
- tool_versions =
- exec_script("get_tool_mtime.py",
- rebase_path([
- "//build/toolchain/apple/filter_libtool.py",
- "//build/toolchain/apple/linker_driver.py",
- "//build/toolchain/ios/compile_xcassets.py",
- "//build/toolchain/ios/swiftc.py",
- ],
- root_build_dir),
- "trim scope")
- # Shared toolchain definition. Invocations should set current_os to set the
- # build args in this definition.
- template("apple_toolchain") {
- toolchain(target_name) {
- # 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.
- assert(defined(invoker.toolchain_args),
- "Toolchains must declare toolchain_args")
- 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.
- host_toolchain = host_toolchain
- # Respect the global setting for whether rustc can make binaries.
- rustc_can_link = rustc_can_link
- }
- # 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.
- if (defined(toolchain_args.use_remoteexec)) {
- toolchain_uses_remoteexec = toolchain_args.use_remoteexec
- } else {
- toolchain_uses_remoteexec = use_remoteexec
- }
- if (defined(toolchain_args.use_goma)) {
- toolchain_uses_goma = toolchain_args.use_goma
- } else {
- toolchain_uses_goma = use_goma
- }
- if (defined(toolchain_args.cc_wrapper)) {
- toolchain_cc_wrapper = toolchain_args.cc_wrapper
- } else {
- toolchain_cc_wrapper = cc_wrapper
- }
- assert(!(toolchain_uses_remoteexec && toolchain_uses_goma),
- "Goma and re-client can't be used together.")
- assert(!(toolchain_cc_wrapper != "" && toolchain_uses_remoteexec),
- "re-client and cc_wrapper can't be used together.")
- assert(!(toolchain_cc_wrapper != "" && toolchain_uses_goma),
- "Goma and cc_wrapper can't be used together.")
- if (defined(toolchain_args.use_lld)) {
- toolchain_uses_lld = toolchain_args.use_lld
- } else {
- toolchain_uses_lld = use_lld
- }
- # The value of all global variables (such as `is_component_build`) is the
- # one from the default toolchain when evaluating a secondary toolchain
- # (see https://crbug.com/gn/286). This mean that the value may change when
- # evaluating target/configs in the new toolchain if the variable default
- # value depends on variable set in `toolchain_args`.
- #
- # For this reason, "ios" needs to override `is_component_build` as its
- # default value depends on `current_os`. Use the overridden value if it
- # is set in `toolchain_args`.
- if (defined(toolchain_args.is_component_build)) {
- toolchain_is_component_build = toolchain_args.is_component_build
- } else {
- toolchain_is_component_build = is_component_build
- }
- prefix = rebase_path("$clang_base_path/bin/", root_build_dir)
- _cc = "${prefix}clang"
- _cxx = "${prefix}clang++"
- swiftmodule_switch = "-Wl,-add_ast_path,"
- # Compute the compiler prefix.
- if (toolchain_uses_remoteexec) {
- if (defined(toolchain_args.rbe_cc_cfg_file)) {
- toolchain_rbe_cc_cfg_file = toolchain_args.rbe_cc_cfg_file
- } else {
- toolchain_rbe_cc_cfg_file = rbe_cc_cfg_file
- }
- # C/C++ (clang) rewrapper prefix to use when use_remoteexec is true.
- compiler_prefix = "${rbe_bin_dir}/rewrapper -cfg=${toolchain_rbe_cc_cfg_file} -exec_root=${rbe_exec_root} "
- } else if (toolchain_uses_goma) {
- assert(toolchain_cc_wrapper == "",
- "Goma and cc_wrapper can't be used together.")
- compiler_prefix = "$goma_dir/gomacc "
- if (use_goma_rust) {
- rust_compiler_prefix = compiler_prefix
- }
- } else if (toolchain_cc_wrapper != "") {
- compiler_prefix = toolchain_cc_wrapper + " "
- } else {
- compiler_prefix = ""
- }
- cc = compiler_prefix + _cc
- cxx = compiler_prefix + _cxx
- ld = _cxx
- # Set the explicit search path for clang++ so it uses the right linker
- # binary.
- if (!toolchain_uses_lld) {
- ld += " -B " + invoker.bin_path
- }
- if (defined(toolchain_args.coverage_instrumentation_input_file)) {
- toolchain_coverage_instrumentation_input_file =
- toolchain_args.coverage_instrumentation_input_file
- } else {
- toolchain_coverage_instrumentation_input_file =
- coverage_instrumentation_input_file
- }
- _use_clang_coverage_wrapper =
- toolchain_coverage_instrumentation_input_file != ""
- if (_use_clang_coverage_wrapper) {
- _coverage_wrapper =
- rebase_path("//build/toolchain/clang_code_coverage_wrapper.py",
- root_build_dir) + " --files-to-instrument=" +
- rebase_path(toolchain_coverage_instrumentation_input_file,
- root_build_dir) + " --target-os=" + target_os
- cc = "$python_path $_coverage_wrapper ${cc}"
- cxx = "$python_path $_coverage_wrapper ${cxx}"
- }
- linker_driver =
- "TOOL_VERSION=${tool_versions.linker_driver} " +
- rebase_path("//build/toolchain/apple/linker_driver.py", root_build_dir)
- # Specify an explicit path for the strip binary.
- _strippath = invoker.bin_path + "strip"
- _installnametoolpath = invoker.bin_path + "install_name_tool"
- linker_driver += " -Wcrl,strippath,${_strippath} -Wcrl,installnametoolpath,${_installnametoolpath}"
- # On iOS, the final applications are assembled using lipo (to support fat
- # builds). The correct flags are passed to the linker_driver.py script
- # directly during the lipo call. The test is against the target_os because
- # there is no need to create .dSYMs for targets compiled for the host.
- if (defined(invoker.strip_with_lipo) && invoker.strip_with_lipo) {
- _enable_dsyms = false
- _save_unstripped_output = false
- } else {
- _enable_dsyms = enable_dsyms
- _save_unstripped_output = save_unstripped_output
- }
- # Make these apply to all tools below.
- lib_switch = "-l"
- lib_dir_switch = "-L"
- # Object files go in this directory. Use label_name instead of
- # target_output_name since labels will generally have no spaces and will be
- # unique in the directory.
- object_subdir = "{{target_out_dir}}/{{label_name}}"
- # If dSYMs are enabled, this flag will be added to the link tools.
- if (_enable_dsyms) {
- dsym_switch = " -Wcrl,dsym,{{root_out_dir}} "
- dsym_switch += "-Wcrl,dsymutilpath," +
- rebase_path("//tools/clang/dsymutil/bin/dsymutil",
- root_build_dir) + " "
- dsym_output_dir =
- "{{root_out_dir}}/{{target_output_name}}{{output_extension}}.dSYM"
- dsym_output = [
- "$dsym_output_dir/Contents/Info.plist",
- "$dsym_output_dir/Contents/Resources/DWARF/" +
- "{{target_output_name}}{{output_extension}}",
- ]
- } else {
- dsym_switch = ""
- }
- if (_save_unstripped_output) {
- _unstripped_output = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}.unstripped"
- }
- if (toolchain_has_rust) {
- if (!defined(rust_compiler_prefix)) {
- rust_compiler_prefix = ""
- }
- rustc_bin = rebase_path("${rust_sysroot}/bin/rustc", root_build_dir)
- rustc = "$rust_compiler_prefix${rustc_bin}"
- rust_sysroot_relative_to_out = rebase_path(rust_sysroot, root_out_dir)
- rustc_wrapper = rebase_path("//build/rust/rustc_wrapper.py")
- # Ideally, we'd add -Clink-args=\"{{ldflags}}\" to each of the Rust
- # tools below which may link (i.e. rust_bin, rust_cdylib, rust_macro).
- # However, it seems -fuse-ld=lld causes difficulties.
- tool("rust_staticlib") {
- rust_outfile = "{{output_dir}}/{{target_output_name}}.a"
- depfile = "{{output}}.d"
- rspfile = "$rust_outfile.rsp"
- rspfile_content = "{{rustdeps}} {{externs}}"
- command = "$python_path \"$rustc_wrapper\" --rustc=$rustc --depfile=$depfile --rsp=$rspfile -- -Clinker=\"$_cxx\" $rustc_common_args --emit=dep-info=$depfile,link -o $rust_outfile LDFLAGS RUSTENV {{rustenv}}"
- description = "RUST $rust_outfile"
- rust_sysroot = rust_sysroot_relative_to_out
- outputs = [ rust_outfile ]
- }
- tool("rust_rlib") {
- rust_outfile = "{{output_dir}}/lib{{target_output_name}}.rlib"
- depfile = "{{output}}.d"
- # Do not use rsp files in this (common) case because they occupy the
- # ninja main thread, and {{rlibs}} have shorter command lines than
- # fully linked targets.
- command = "$python_path \"$rustc_wrapper\" --rustc=$rustc --depfile=$depfile -- -Clinker=\"$_cxx\" $rustc_common_args {{rustdeps}} {{externs}} --emit=dep-info=$depfile,link -o $rust_outfile LDFLAGS RUSTENV {{rustenv}}"
- description = "RUST $rust_outfile"
- rust_sysroot = rust_sysroot_relative_to_out
- outputs = [ rust_outfile ]
- }
- if (toolchain_args.rustc_can_link) {
- tool("rust_bin") {
- rust_outfile = "{{root_out_dir}}/{{target_output_name}}"
- depfile = "{{output}}.d"
- rspfile = "$rust_outfile.rsp"
- rspfile_content = "{{rustdeps}} {{externs}}"
- command = "$python_path \"$rustc_wrapper\" --rustc=$rustc --depfile=$depfile --rsp=$rspfile -- -Clinker=\"${_cxx}\" $rustc_common_args --emit=dep-info=$depfile,link -o $rust_outfile LDFLAGS {{ldflags}} RUSTENV {{rustenv}}"
- description = "RUST $rust_outfile"
- rust_sysroot = rust_sysroot_relative_to_out
- outputs = [ rust_outfile ]
- }
- tool("rust_cdylib") {
- rust_outfile = "{{output_dir}}/lib{{target_output_name}}.dylib"
- depfile = "{{output}}.d"
- rspfile = "$rust_outfile.rsp"
- rspfile_content = "{{rustdeps}} {{externs}}"
- command = "$python_path \"$rustc_wrapper\" --rustc=$rustc --depfile=$depfile --rsp=$rspfile -- -Clinker=\"${_cxx}\" $rustc_common_args --emit=dep-info=$depfile,link -o $rust_outfile LDFLAGS {{ldflags}} RUSTENV {{rustenv}}"
- description = "RUST $rust_outfile"
- rust_sysroot = rust_sysroot_relative_to_out
- outputs = [ rust_outfile ]
- }
- tool("rust_macro") {
- rust_outfile = "{{output_dir}}/lib{{target_output_name}}.dylib"
- depfile = "{{output}}.d"
- rspfile = "$rust_outfile.rsp"
- rspfile_content = "{{rustdeps}} {{externs}}"
- command = "$python_path \"$rustc_wrapper\" --rustc=$rustc --depfile=$depfile --rsp=$rspfile -- -Clinker=\"${_cxx}\" $rustc_common_args --emit=dep-info=$depfile,link -o $rust_outfile LDFLAGS {{ldflags}} RUSTENV {{rustenv}}"
- description = "RUST $rust_outfile"
- rust_sysroot = rust_sysroot_relative_to_out
- outputs = [ rust_outfile ]
- }
- }
- }
- tool("cc") {
- depfile = "{{output}}.d"
- precompiled_header_type = "gcc"
- command = "$cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} -c {{source}} -o {{output}}"
- depsformat = "gcc"
- description = "CC {{output}}"
- outputs = [ "$object_subdir/{{source_name_part}}.o" ]
- }
- tool("cxx") {
- depfile = "{{output}}.d"
- precompiled_header_type = "gcc"
- command = "$cxx -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} -c {{source}} -o {{output}}"
- depsformat = "gcc"
- description = "CXX {{output}}"
- outputs = [ "$object_subdir/{{source_name_part}}.o" ]
- }
- tool("asm") {
- # For GCC we can just use the C compiler to compile assembly.
- depfile = "{{output}}.d"
- command = "$cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{asmflags}} -c {{source}} -o {{output}}"
- depsformat = "gcc"
- description = "ASM {{output}}"
- outputs = [ "$object_subdir/{{source_name_part}}.o" ]
- }
- tool("objc") {
- depfile = "{{output}}.d"
- precompiled_header_type = "gcc"
- command = "$cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{framework_dirs}} {{cflags}} {{cflags_objc}} -c {{source}} -o {{output}}"
- depsformat = "gcc"
- description = "OBJC {{output}}"
- outputs = [ "$object_subdir/{{source_name_part}}.o" ]
- }
- tool("objcxx") {
- depfile = "{{output}}.d"
- precompiled_header_type = "gcc"
- command = "$cxx -MMD -MF $depfile {{defines}} {{include_dirs}} {{framework_dirs}} {{cflags}} {{cflags_objcc}} -c {{source}} -o {{output}}"
- depsformat = "gcc"
- description = "OBJCXX {{output}}"
- outputs = [ "$object_subdir/{{source_name_part}}.o" ]
- }
- tool("alink") {
- rspfile = "{{output}}.rsp"
- rspfile_content = "{{inputs}}"
- if (!toolchain_uses_lld) {
- script = rebase_path("//build/toolchain/apple/filter_libtool.py",
- root_build_dir)
- # Specify explicit path for libtool.
- libtool = invoker.bin_path + "libtool"
- command = "rm -f {{output}} && TOOL_VERSION=${tool_versions.filter_libtool} $python_path $script $libtool -static -D {{arflags}} -o {{output}} @$rspfile"
- description = "LIBTOOL-STATIC {{output}}"
- } else {
- ar = "${prefix}llvm-ar"
- command = "\"$ar\" {{arflags}} -r -c -s -D {{output}} @$rspfile"
- # Remove the output file first so that ar doesn't try to modify the
- # existing file.
- command = "rm -f {{output}} && $command"
- description = "AR {{output}}"
- }
- outputs = [ "{{output_dir}}/{{target_output_name}}{{output_extension}}" ]
- default_output_dir = "{{target_out_dir}}"
- default_output_extension = ".a"
- output_prefix = "lib"
- }
- tool("solink") {
- # E.g. "./libfoo.dylib":
- dylib = "{{output_dir}}/{{target_output_name}}{{output_extension}}"
- rspfile = dylib + ".rsp"
- pool = "//build/toolchain:link_pool($default_toolchain)"
- # These variables are not built into GN but are helpers that implement
- # (1) linking to produce a .dylib, (2) extracting the symbols from that
- # file to a temporary file, (3) if the temporary file has differences from
- # the existing .TOC file, overwrite it, otherwise, don't change it.
- #
- # As a special case, if the library reexports symbols from other dynamic
- # libraries, we always update the .TOC and skip the temporary file and
- # diffing steps, since that library always needs to be re-linked.
- tocname = dylib + ".TOC"
- temporary_tocname = dylib + ".tmp"
- # Use explicit paths to binaries. The binaries present on the default
- # search path in /usr/bin are thin wrappers around xcrun, which requires a
- # full CommandLineTools or Xcode install, and still may not choose the
- # appropriate binary if there are multiple installs.
- if (host_os == "mac") {
- nm = invoker.bin_path + "nm"
- otool = invoker.bin_path + "otool"
- } else {
- nm = "${prefix}llvm-nm"
- otool = "${prefix}llvm-otool"
- }
- does_reexport_command = "[ ! -e \"$dylib\" -o ! -e \"$tocname\" ] || $otool -l \"$dylib\" | grep -q LC_REEXPORT_DYLIB"
- link_command = "$linker_driver $ld -shared "
- if (toolchain_is_component_build) {
- link_command += " -Wl,-install_name,@rpath/\"{{target_output_name}}{{output_extension}}\" "
- }
- link_command += dsym_switch
- link_command += "{{ldflags}} -o \"$dylib\" \"@$rspfile\""
- replace_command = "if ! cmp -s \"$temporary_tocname\" \"$tocname\"; then mv \"$temporary_tocname\" \"$tocname\""
- extract_toc_command = "{ $otool -l \"$dylib\" | grep LC_ID_DYLIB -A 5; $nm -gPp \"$dylib\" | cut -f1-2 -d' ' | grep -v U\$\$; true; }"
- command = "if $does_reexport_command ; then $link_command && $extract_toc_command > \"$tocname\"; else $link_command && $extract_toc_command > \"$temporary_tocname\" && $replace_command ; fi; fi"
- rspfile_content = "{{inputs}} {{frameworks}} {{swiftmodules}} {{solibs}} {{libs}} {{rlibs}}"
- description = "SOLINK {{output}}"
- # Use this for {{output_extension}} expansions unless a target manually
- # overrides it (in which case {{output_extension}} will be what the target
- # specifies).
- default_output_dir = "{{root_out_dir}}"
- default_output_extension = ".dylib"
- output_prefix = "lib"
- # Since the above commands only updates the .TOC file when it changes, ask
- # Ninja to check if the timestamp actually changed to know if downstream
- # dependencies should be recompiled.
- restat = true
- # Tell GN about the output files. It will link to the dylib but use the
- # tocname for dependency management.
- outputs = [
- dylib,
- tocname,
- ]
- link_output = dylib
- depend_output = tocname
- if (_enable_dsyms) {
- outputs += dsym_output
- }
- if (_save_unstripped_output) {
- outputs += [ _unstripped_output ]
- }
- }
- tool("solink_module") {
- # E.g. "./libfoo.so":
- sofile = "{{output_dir}}/{{target_output_name}}{{output_extension}}"
- rspfile = sofile + ".rsp"
- pool = "//build/toolchain:link_pool($default_toolchain)"
- link_command =
- "$linker_driver $ld -bundle {{ldflags}} -o \"$sofile\" \"@$rspfile\""
- link_command += dsym_switch
- command = link_command
- rspfile_content = "{{inputs}} {{frameworks}} {{swiftmodules}} {{solibs}} {{libs}} {{rlibs}}"
- description = "SOLINK_MODULE {{output}}"
- # Use this for {{output_extension}} expansions unless a target manually
- # overrides it (in which case {{output_extension}} will be what the target
- # specifies).
- default_output_dir = "{{root_out_dir}}"
- default_output_extension = ".so"
- outputs = [ sofile ]
- if (_enable_dsyms) {
- outputs += dsym_output
- }
- if (_save_unstripped_output) {
- outputs += [ _unstripped_output ]
- }
- }
- tool("link") {
- outfile = "{{output_dir}}/{{target_output_name}}{{output_extension}}"
- rspfile = "$outfile.rsp"
- pool = "//build/toolchain:link_pool($default_toolchain)"
- command = "$linker_driver $ld $dsym_switch {{ldflags}} -o \"$outfile\" \"@$rspfile\""
- description = "LINK $outfile"
- rspfile_content = "{{inputs}} {{frameworks}} {{swiftmodules}} {{solibs}} {{libs}} {{rlibs}}"
- outputs = [ outfile ]
- if (_enable_dsyms) {
- outputs += dsym_output
- }
- if (_save_unstripped_output) {
- outputs += [ _unstripped_output ]
- }
- default_output_dir = "{{root_out_dir}}"
- }
- # These two are really entirely generic, but have to be repeated in
- # each toolchain because GN doesn't allow a template to be used here.
- # See //build/toolchain/toolchain.gni for details.
- tool("stamp") {
- command = stamp_command
- description = stamp_description
- }
- tool("copy") {
- command = copy_command
- description = copy_description
- }
- tool("copy_bundle_data") {
- # copy_command use hardlink if possible but this does not work with
- # directories. Also when running EG2 tests from Xcode, Xcode tries to
- # copy some files into the application bundle which fails if source
- # and destination are hardlinked together.
- #
- # Instead use clonefile to copy the files which is as efficient as
- # hardlink but ensure the file have distinct metadata (thus avoid the
- # error with ditto, see https://crbug.com/1042182).
- if (host_os == "mac") {
- command = "rm -rf {{output}} && /bin/cp -Rc {{source}} {{output}}"
- } else {
- command = "rm -rf {{output}} && /bin/cp -Rl {{source}} {{output}}"
- }
- description = "COPY_BUNDLE_DATA {{source}} {{output}}"
- pool = "//build/toolchain/apple:bundle_pool($default_toolchain)"
- }
- # Swift is only used on iOS, not macOS. We want to minimize the number
- # of Xcode-based tools used by the macOS toolchain, so we intentionally
- # disallow future uses of Swift on macOS. https://crbug.com/965663.
- if (toolchain_args.current_os == "ios") {
- tool("swift") {
- _tool = rebase_path("//build/toolchain/ios/swiftc.py", root_build_dir)
- depfile = "{{target_out_dir}}/{{module_name}}.d"
- depsformat = "gcc"
- outputs = [
- # The module needs to be the first output listed. The blank line after
- # the module is required to prevent `gn format` from changing the file
- # order.
- "{{target_gen_dir}}/{{module_name}}.swiftmodule",
- "{{target_gen_dir}}/{{target_output_name}}.h",
- "{{target_gen_dir}}/{{module_name}}.swiftdoc",
- "{{target_gen_dir}}/{{module_name}}.swiftsourceinfo",
- ]
- if (swift_whole_module_optimization) {
- _extra_flags = "-whole-module-optimization"
- _objects_dir = "{{target_out_dir}}"
- outputs += [ "$_objects_dir/{{module_name}}.o" ]
- } else {
- _extra_flags = ""
- _objects_dir = "{{target_out_dir}}/{{label_name}}"
- partial_outputs = [ "$_objects_dir/{{source_name_part}}.o" ]
- }
- _env_vars = "TOOL_VERSION=${tool_versions.swiftc}"
- if (invoker.sdk_developer_dir != "") {
- _env_vars += " DEVELOPER_DIR=${toolchain_args.sdk_developer_dir}"
- }
- # Starting with version 5.6, the Swift compiler will always
- # generates precompiled headers. In anterior version, it was
- # used when bridging headers and whole module optimisation
- # where enabled, and it could be disabled with the parameter
- # `-disable-bridging-pch`.
- #
- # The precompiled headers are binary files (i.e. they are not
- # regular Objective-C header files and cannot be loaded as such).
- #
- # There is an hidden requirements that the compiler needs to
- # be told where to save those .pch files (via the parameter
- # `-pch-output-dir $dir`). If this parameter is not passed, the
- # compiler will silently write them at an incorrect location,
- # leading later pass to try to load those .pch files as either
- # regular header files (.h) or object files (.o) and causing
- # to compilation failures.
- #
- # List the directory where the precompiled header is generated
- # as an output, but do not list the .pch file itself. This is
- # because the names includes two hashes (one corresponding to
- # the compiler revision, and the other probably derived from
- # the module itself) that are difficult to generate.
- #
- # Still we want to avoid creating a directory that has the same
- # name as a file generated by another rule, so explicitly list
- # the directory in `outputs` so that gn can warn it is conflicts
- # with another output file.
- _pch_output_dir = "{{target_out_dir}}/{{module_name}}:pch/"
- outputs += [ _pch_output_dir ]
- command =
- "$_env_vars $python_path $_tool -module-name {{module_name}} " +
- "-root-dir " + rebase_path("//", root_build_dir) + " " +
- "-object-dir $_objects_dir -pch-output-dir $_pch_output_dir " +
- "-module-path {{target_gen_dir}}/{{module_name}}.swiftmodule " +
- "-header-path {{target_gen_dir}}/{{target_output_name}}.h " +
- "-depfile {{target_out_dir}}/{{module_name}}.d " +
- "-depfile-filter {{target_gen_dir}}/{{module_name}}.swiftmodule " +
- "-bridge-header {{bridge_header}} $_extra_flags " +
- "{{swiftflags}} {{include_dirs}} {{module_dirs}} {{inputs}}"
- }
- }
- # xcassets are only used on iOS, not macOS. We want to minimize the number
- # of Xcode-based tools used by the macOS toolchain, so we intentionally
- # disallow future uses of xcassets on macOS. https://crbug.com/965663.
- if (toolchain_args.current_os == "ios") {
- tool("compile_xcassets") {
- _tool = rebase_path("//build/toolchain/ios/compile_xcassets.py",
- root_build_dir)
- _env_vars = "TOOL_VERSION=${tool_versions.compile_xcassets}"
- if (invoker.sdk_developer_dir != "") {
- _env_vars += " DEVELOPER_DIR=${toolchain_args.sdk_developer_dir}"
- }
- command =
- "$_env_vars $python_path $_tool -p \"${invoker.sdk_name}\" " +
- "-t \"${invoker.deployment_target}\" " +
- "-T \"{{bundle_product_type}}\" " +
- "-P \"{{bundle_partial_info_plist}}\" " + "-o {{output}} {{inputs}}"
- description = "COMPILE_XCASSETS {{output}}"
- pool = "//build/toolchain/apple:bundle_pool($default_toolchain)"
- }
- }
- tool("action") {
- pool = "//build/toolchain:action_pool($default_toolchain)"
- }
- }
- }
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