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Rules Foreign CC

boost_build

boost_build(name, additional_inputs, additional_tools, alwayslink, binaries, bootstrap_options,
            data, defines, deps, env, headers_only, interface_libraries, lib_name, lib_source,
            linkopts, make_commands, out_bin_dir, out_include_dir, out_lib_dir, postfix_script,
            shared_libraries, static_libraries, tools_deps, user_options)

Rule for building Boost. Invokes bootstrap.sh and then b2 install.

ATTRIBUTES

Name Description Type Mandatory Default
name A unique name for this target. Name required
additional_inputs Optional additional inputs to be declared as needed for the shell script action.Not used by the shell script part in cc_external_rule_impl. List of labels optional []
additional_tools Optional additional tools needed for the building. Not used by the shell script part in cc_external_rule_impl. List of labels optional []
alwayslink Optional. if true, link all the object files from the static library, even if they are not used. Boolean optional False
binaries Optional names of the resulting binaries. List of strings optional []
bootstrap_options any additional flags to pass to bootstrap.sh List of strings optional []
data Files needed by this rule at runtime. May list file or rule targets. Generally allows any target. List of labels optional []
defines Optional compilation definitions to be passed to the dependencies of this library. They are NOT passed to the compiler, you should duplicate them in the configuration options. List of strings optional []
deps Optional dependencies to be copied into the directory structure. Typically those directly required for the external building of the library/binaries. (i.e. those that the external buidl system will be looking for and paths to which are provided by the calling rule) List of labels optional []
env Environment variables to set during the build. $(execpath) macros may be used to point at files which are listed as data deps, tools_deps, or additional_tools, but unlike with other rules, these will be replaced with absolute paths to those files, because the build does not run in the exec root. No other macros are supported. Dictionary: String -> String optional {}
headers_only Flag variable to indicate that the library produces only headers Boolean optional False
interface_libraries Optional names of the resulting interface libraries. List of strings optional []
lib_name Library name. Defines the name of the install directory and the name of the static library, if no output files parameters are defined (any of static_libraries, shared_libraries, interface_libraries, binaries_names) Optional. If not defined, defaults to the target's name. String optional ""
lib_source Label with source code to build. Typically a filegroup for the source of remote repository. Mandatory. Label required
linkopts Optional link options to be passed up to the dependencies of this library List of strings optional []
make_commands Optinal make commands, defaults to ["make", "make install"] List of strings optional ["make", "make install"]
out_bin_dir Optional name of the output subdirectory with the binary files, defaults to 'bin'. String optional "bin"
out_include_dir Optional name of the output subdirectory with the header files, defaults to 'include'. String optional "include"
out_lib_dir Optional name of the output subdirectory with the library files, defaults to 'lib'. String optional "lib"
postfix_script Optional part of the shell script to be added after the make commands String optional ""
shared_libraries Optional names of the resulting shared libraries. List of strings optional []
static_libraries Optional names of the resulting static libraries. List of strings optional []
tools_deps Optional tools to be copied into the directory structure. Similar to deps, those directly required for the external building of the library/binaries. List of labels optional []
user_options any additional flags to pass to b2 List of strings optional []

cmake_external

cmake_external(name, additional_inputs, additional_tools, alwayslink, binaries, cache_entries,
               cmake_options, data, defines, deps, env, env_vars, generate_crosstool_file,
               headers_only, install_prefix, interface_libraries, lib_name, lib_source, linkopts,
               make_commands, out_bin_dir, out_include_dir, out_lib_dir, postfix_script,
               shared_libraries, static_libraries, tools_deps, working_directory)

Rule for building external library with CMake.

ATTRIBUTES

Name Description Type Mandatory Default
name A unique name for this target. Name required
additional_inputs Optional additional inputs to be declared as needed for the shell script action.Not used by the shell script part in cc_external_rule_impl. List of labels optional []
additional_tools Optional additional tools needed for the building. Not used by the shell script part in cc_external_rule_impl. List of labels optional []
alwayslink Optional. if true, link all the object files from the static library, even if they are not used. Boolean optional False
binaries Optional names of the resulting binaries. List of strings optional []
cache_entries CMake cache entries to initialize (they will be passed with -Dkey=value) Values, defined by the toolchain, will be joined with the values, passed here. (Toolchain values come first) Dictionary: String -> String optional {}
cmake_options Other CMake options List of strings optional []
data Files needed by this rule at runtime. May list file or rule targets. Generally allows any target. List of labels optional []
defines Optional compilation definitions to be passed to the dependencies of this library. They are NOT passed to the compiler, you should duplicate them in the configuration options. List of strings optional []
deps Optional dependencies to be copied into the directory structure. Typically those directly required for the external building of the library/binaries. (i.e. those that the external buidl system will be looking for and paths to which are provided by the calling rule) List of labels optional []
env Environment variables to set during the build. $(execpath) macros may be used to point at files which are listed as data deps, tools_deps, or additional_tools, but unlike with other rules, these will be replaced with absolute paths to those files, because the build does not run in the exec root. No other macros are supported. Dictionary: String -> String optional {}
env_vars CMake environment variable values to join with toolchain-defined. For example, additional CXXFLAGS. Dictionary: String -> String optional {}
generate_crosstool_file When True, CMake crosstool file will be generated from the toolchain values, provided cache-entries and env_vars (some values will still be passed as -Dkey=value and environment variables). If CMAKE_TOOLCHAIN_FILE cache entry is passed, specified crosstool file will be used When using this option to cross-compile, it is required to specify CMAKE_SYSTEM_NAME in the cache_entries Boolean optional True
headers_only Flag variable to indicate that the library produces only headers Boolean optional False
install_prefix Relative install prefix to be passed to CMake in -DCMAKE_INSTALL_PREFIX String optional ""
interface_libraries Optional names of the resulting interface libraries. List of strings optional []
lib_name Library name. Defines the name of the install directory and the name of the static library, if no output files parameters are defined (any of static_libraries, shared_libraries, interface_libraries, binaries_names) Optional. If not defined, defaults to the target's name. String optional ""
lib_source Label with source code to build. Typically a filegroup for the source of remote repository. Mandatory. Label required
linkopts Optional link options to be passed up to the dependencies of this library List of strings optional []
make_commands Optinal make commands, defaults to ["make", "make install"] List of strings optional ["make", "make install"]
out_bin_dir Optional name of the output subdirectory with the binary files, defaults to 'bin'. String optional "bin"
out_include_dir Optional name of the output subdirectory with the header files, defaults to 'include'. String optional "include"
out_lib_dir Optional name of the output subdirectory with the library files, defaults to 'lib'. String optional "lib"
postfix_script Optional part of the shell script to be added after the make commands String optional ""
shared_libraries Optional names of the resulting shared libraries. List of strings optional []
static_libraries Optional names of the resulting static libraries. List of strings optional []
tools_deps Optional tools to be copied into the directory structure. Similar to deps, those directly required for the external building of the library/binaries. List of labels optional []
working_directory Working directory, with the main CMakeLists.txt (otherwise, the top directory of the lib_source label files is used.) String optional ""

cmake_tool

cmake_tool(name, cmake_srcs)

Rule for building CMake. Invokes bootstrap script and make install.

ATTRIBUTES

Name Description Type Mandatory Default
name A unique name for this target. Name required
cmake_srcs - Label required

configure_make

configure_make(name, additional_inputs, additional_tools, alwayslink, autoconf, autoconf_env_vars,
               autoconf_options, autogen, autogen_command, autogen_env_vars, autogen_options,
               autoreconf, autoreconf_env_vars, autoreconf_options, binaries, configure_command,
               configure_env_vars, configure_in_place, configure_options, data, defines, deps, env,
               headers_only, install_prefix, interface_libraries, lib_name, lib_source, linkopts,
               make_commands, out_bin_dir, out_include_dir, out_lib_dir, postfix_script,
               shared_libraries, static_libraries, tools_deps)

Rule for building external libraries with configure-make pattern. Some 'configure' script is invoked with --prefix=install (by default), and other parameters for compilation and linking, taken from Bazel C/C++ toolchain and passed dependencies. After configuration, GNU Make is called.

ATTRIBUTES

Name Description Type Mandatory Default
name A unique name for this target. Name required
additional_inputs Optional additional inputs to be declared as needed for the shell script action.Not used by the shell script part in cc_external_rule_impl. List of labels optional []
additional_tools Optional additional tools needed for the building. Not used by the shell script part in cc_external_rule_impl. List of labels optional []
alwayslink Optional. if true, link all the object files from the static library, even if they are not used. Boolean optional False
autoconf Set to True if 'autoconf' should be invoked before 'configure', currently requires 'configure_in_place' to be True. Boolean optional False
autoconf_env_vars Environment variables to be set for 'autoconf' invocation. Dictionary: String -> String optional {}
autoconf_options Any options to be put in the 'autoconf.sh' command line. List of strings optional []
autogen Set to True if 'autogen.sh' should be invoked before 'configure', currently requires 'configure_in_place' to be True. Boolean optional False
autogen_command The name of the autogen script file, default: autogen.sh. Many projects use autogen.sh however the Autotools FAQ recommends bootstrap so we provide this option to support that. String optional "autogen.sh"
autogen_env_vars Environment variables to be set for 'autogen' invocation. Dictionary: String -> String optional {}
autogen_options Any options to be put in the 'autogen.sh' command line. List of strings optional []
autoreconf Set to True if 'autoreconf' should be invoked before 'configure.', currently requires 'configure_in_place' to be True. Boolean optional False
autoreconf_env_vars Environment variables to be set for 'autoreconf' invocation. Dictionary: String -> String optional {}
autoreconf_options Any options to be put in the 'autoreconf.sh' command line. List of strings optional []
binaries Optional names of the resulting binaries. List of strings optional []
configure_command The name of the configuration script file, default: configure. The file must be in the root of the source directory. String optional "configure"
configure_env_vars Environment variables to be set for the 'configure' invocation. Dictionary: String -> String optional {}
configure_in_place Set to True if 'configure' should be invoked in place, i.e. from its enclosing directory. Boolean optional False
configure_options Any options to be put on the 'configure' command line. List of strings optional []
data Files needed by this rule at runtime. May list file or rule targets. Generally allows any target. List of labels optional []
defines Optional compilation definitions to be passed to the dependencies of this library. They are NOT passed to the compiler, you should duplicate them in the configuration options. List of strings optional []
deps Optional dependencies to be copied into the directory structure. Typically those directly required for the external building of the library/binaries. (i.e. those that the external buidl system will be looking for and paths to which are provided by the calling rule) List of labels optional []
env Environment variables to set during the build. $(execpath) macros may be used to point at files which are listed as data deps, tools_deps, or additional_tools, but unlike with other rules, these will be replaced with absolute paths to those files, because the build does not run in the exec root. No other macros are supported. Dictionary: String -> String optional {}
headers_only Flag variable to indicate that the library produces only headers Boolean optional False
install_prefix Install prefix, i.e. relative path to where to install the result of the build. Passed to the 'configure' script with --prefix flag. String optional ""
interface_libraries Optional names of the resulting interface libraries. List of strings optional []
lib_name Library name. Defines the name of the install directory and the name of the static library, if no output files parameters are defined (any of static_libraries, shared_libraries, interface_libraries, binaries_names) Optional. If not defined, defaults to the target's name. String optional ""
lib_source Label with source code to build. Typically a filegroup for the source of remote repository. Mandatory. Label required
linkopts Optional link options to be passed up to the dependencies of this library List of strings optional []
make_commands Optinal make commands, defaults to ["make", "make install"] List of strings optional ["make", "make install"]
out_bin_dir Optional name of the output subdirectory with the binary files, defaults to 'bin'. String optional "bin"
out_include_dir Optional name of the output subdirectory with the header files, defaults to 'include'. String optional "include"
out_lib_dir Optional name of the output subdirectory with the library files, defaults to 'lib'. String optional "lib"
postfix_script Optional part of the shell script to be added after the make commands String optional ""
shared_libraries Optional names of the resulting shared libraries. List of strings optional []
static_libraries Optional names of the resulting static libraries. List of strings optional []
tools_deps Optional tools to be copied into the directory structure. Similar to deps, those directly required for the external building of the library/binaries. List of labels optional []

make

make(name, additional_inputs, additional_tools, alwayslink, binaries, data, defines, deps, env,
     headers_only, interface_libraries, keep_going, lib_name, lib_source, linkopts, make_commands,
     make_env_vars, out_bin_dir, out_include_dir, out_lib_dir, postfix_script, prefix,
     shared_libraries, static_libraries, tools_deps)

Rule for building external libraries with GNU Make. GNU Make commands (make and make install by default) are invoked with prefix="install" (by default), and other environment variables for compilation and linking, taken from Bazel C/C++ toolchain and passed dependencies.

ATTRIBUTES

Name Description Type Mandatory Default
name A unique name for this target. Name required
additional_inputs Optional additional inputs to be declared as needed for the shell script action.Not used by the shell script part in cc_external_rule_impl. List of labels optional []
additional_tools Optional additional tools needed for the building. Not used by the shell script part in cc_external_rule_impl. List of labels optional []
alwayslink Optional. if true, link all the object files from the static library, even if they are not used. Boolean optional False
binaries Optional names of the resulting binaries. List of strings optional []
data Files needed by this rule at runtime. May list file or rule targets. Generally allows any target. List of labels optional []
defines Optional compilation definitions to be passed to the dependencies of this library. They are NOT passed to the compiler, you should duplicate them in the configuration options. List of strings optional []
deps Optional dependencies to be copied into the directory structure. Typically those directly required for the external building of the library/binaries. (i.e. those that the external buidl system will be looking for and paths to which are provided by the calling rule) List of labels optional []
env Environment variables to set during the build. $(execpath) macros may be used to point at files which are listed as data deps, tools_deps, or additional_tools, but unlike with other rules, these will be replaced with absolute paths to those files, because the build does not run in the exec root. No other macros are supported. Dictionary: String -> String optional {}
headers_only Flag variable to indicate that the library produces only headers Boolean optional False
interface_libraries Optional names of the resulting interface libraries. List of strings optional []
keep_going Keep going when some targets can not be made, -k flag is passed to make (applies only if make_commands attribute is not set). Please have a look at _create_make_script for default make_commands. Boolean optional True
lib_name Library name. Defines the name of the install directory and the name of the static library, if no output files parameters are defined (any of static_libraries, shared_libraries, interface_libraries, binaries_names) Optional. If not defined, defaults to the target's name. String optional ""
lib_source Label with source code to build. Typically a filegroup for the source of remote repository. Mandatory. Label required
linkopts Optional link options to be passed up to the dependencies of this library List of strings optional []
make_commands Overriding make_commands default value to be empty, then we can provide better default value programmatically List of strings optional []
make_env_vars Environment variables to be set for the 'configure' invocation. Dictionary: String -> String optional {}
out_bin_dir Optional name of the output subdirectory with the binary files, defaults to 'bin'. String optional "bin"
out_include_dir Optional name of the output subdirectory with the header files, defaults to 'include'. String optional "include"
out_lib_dir Optional name of the output subdirectory with the library files, defaults to 'lib'. String optional "lib"
postfix_script Optional part of the shell script to be added after the make commands String optional ""
prefix Install prefix, an absolute path. Passed to the GNU make via "make install PREFIX=<value>". By default, the install directory created under sandboxed execution root is used. Build results are copied to the Bazel's output directory, so the prefix is only important if it is recorded into any text files by Makefile script. In that case, it is important to note that rules_foreign_cc is overriding the paths under execution root with "BAZEL_GEN_ROOT" value. String optional ""
shared_libraries Optional names of the resulting shared libraries. List of strings optional []
static_libraries Optional names of the resulting static libraries. List of strings optional []
tools_deps Optional tools to be copied into the directory structure. Similar to deps, those directly required for the external building of the library/binaries. List of labels optional []

make_tool

make_tool(name, make_srcs)

Rule for building Make. Invokes configure script and make install.

ATTRIBUTES

Name Description Type Mandatory Default
name A unique name for this target. Name required
make_srcs target with the Make sources Label required

native_tool_toolchain

native_tool_toolchain(name, path, target)

Rule for defining the toolchain data of the native tools (cmake, ninja), to be used by rules_foreign_cc with toolchain types @rules_foreign_cc//tools/build_defs:cmake_toolchain and @rules_foreign_cc//tools/build_defs:ninja_toolchain.

ATTRIBUTES

Name Description Type Mandatory Default
name A unique name for this target. Name required
path Absolute path to the tool in case the tool is preinstalled on the machine. Relative path to the tool in case the tool is built as part of a build; the path should be relative to the bazel-genfiles, i.e. it should start with the name of the top directory of the built tree artifact. (Please see the example //examples:built_cmake_toolchain) String optional ""
target If the tool is preinstalled, must be None. If the tool is built as part of the build, the corresponding build target, which should produce the tree artifact with the binary to call. Label optional None

ninja

ninja(name, additional_inputs, additional_tools, alwayslink, args, binaries, data, defines, deps,
      directory, env, headers_only, interface_libraries, lib_name, lib_source, linkopts, out_bin_dir,
      out_include_dir, out_lib_dir, postfix_script, shared_libraries, static_libraries, targets,
      tools_deps)

Rule for building external libraries with Ninja.

ATTRIBUTES

Name Description Type Mandatory Default
name A unique name for this target. Name required
additional_inputs Optional additional inputs to be declared as needed for the shell script action.Not used by the shell script part in cc_external_rule_impl. List of labels optional []
additional_tools Optional additional tools needed for the building. Not used by the shell script part in cc_external_rule_impl. List of labels optional []
alwayslink Optional. if true, link all the object files from the static library, even if they are not used. Boolean optional False
args A list of arguments to pass to the call to ninja List of strings optional []
binaries Optional names of the resulting binaries. List of strings optional []
data Files needed by this rule at runtime. May list file or rule targets. Generally allows any target. List of labels optional []
defines Optional compilation definitions to be passed to the dependencies of this library. They are NOT passed to the compiler, you should duplicate them in the configuration options. List of strings optional []
deps Optional dependencies to be copied into the directory structure. Typically those directly required for the external building of the library/binaries. (i.e. those that the external buidl system will be looking for and paths to which are provided by the calling rule) List of labels optional []
directory A directory to pass as the -C argument. The rule will always use the root directory of the lib_sources attribute if this attribute is not set String optional ""
env Environment variables to set during the build. $(execpath) macros may be used to point at files which are listed as data deps, tools_deps, or additional_tools, but unlike with other rules, these will be replaced with absolute paths to those files, because the build does not run in the exec root. No other macros are supported. Dictionary: String -> String optional {}
headers_only Flag variable to indicate that the library produces only headers Boolean optional False
interface_libraries Optional names of the resulting interface libraries. List of strings optional []
lib_name Library name. Defines the name of the install directory and the name of the static library, if no output files parameters are defined (any of static_libraries, shared_libraries, interface_libraries, binaries_names) Optional. If not defined, defaults to the target's name. String optional ""
lib_source Label with source code to build. Typically a filegroup for the source of remote repository. Mandatory. Label required
linkopts Optional link options to be passed up to the dependencies of this library List of strings optional []
out_bin_dir Optional name of the output subdirectory with the binary files, defaults to 'bin'. String optional "bin"
out_include_dir Optional name of the output subdirectory with the header files, defaults to 'include'. String optional "include"
out_lib_dir Optional name of the output subdirectory with the library files, defaults to 'lib'. String optional "lib"
postfix_script Optional part of the shell script to be added after the make commands String optional ""
shared_libraries Optional names of the resulting shared libraries. List of strings optional []
static_libraries Optional names of the resulting static libraries. List of strings optional []
targets A list of ninja targets to build. To call the default target, simply pass "" as one of the items to this attribute. List of strings optional []
tools_deps Optional tools to be copied into the directory structure. Similar to deps, those directly required for the external building of the library/binaries. List of labels optional []

ninja_tool

ninja_tool(name, ninja_srcs)

Rule for building Ninja. Invokes configure script and make install.

ATTRIBUTES

Name Description Type Mandatory Default
name A unique name for this target. Name required
ninja_srcs - Label required

ConfigureParameters

ConfigureParameters(ctx, attrs, inputs)

Parameters of create_configure_script callback function, called by cc_external_rule_impl function. create_configure_script creates the configuration part of the script, and allows to reuse the inputs structure, created by the framework.

FIELDS

Name Description
ctx Rule context
attrs Attributes struct, created by create_attrs function above
inputs InputFiles provider: summarized information on rule inputs, created by framework function, to be reused in script creator. Contains in particular merged compilation and linking dependencies.

ForeignCcArtifact

ForeignCcArtifact(bin_dir_name, gen_dir, include_dir_name, lib_dir_name)

Groups information about the external library install directory, and relative bin, include and lib directories.

Serves to pass transitive information about externally built artifacts up the dependency chain.

Can not be used as a top-level provider. Instances of ForeignCcArtifact are incapsulated in a depset ForeignCcDeps#artifacts.

FIELDS

Name Description
bin_dir_name Bin directory, relative to install directory
gen_dir Install directory
include_dir_name Include directory, relative to install directory
lib_dir_name Lib directory, relative to install directory

ForeignCcDeps

ForeignCcDeps(artifacts)

Provider to pass transitive information about external libraries.

FIELDS

Name Description
artifacts Depset of ForeignCcArtifact

InputFiles

InputFiles(headers, include_dirs, libs, tools_files, ext_build_dirs, deps_compilation_info,
           deps_linking_info, declared_inputs)

Provider to keep different kinds of input files, directories, and C/C++ compilation and linking info from dependencies

FIELDS

Name Description
headers Include files built by Bazel. Will be copied into $EXT_BUILD_DEPS/include.
include_dirs Include directories built by Bazel. Will be copied into $EXT_BUILD_DEPS/include.
libs Library files built by Bazel. Will be copied into $EXT_BUILD_DEPS/lib.
tools_files Files and directories with tools needed for configuration/building to be copied into the bin folder, which is added to the PATH
ext_build_dirs Directories with libraries, built by framework function. This directories should be copied into $EXT_BUILD_DEPS/lib-name as is, with all contents.
deps_compilation_info Merged CcCompilationInfo from deps attribute
deps_linking_info Merged CcLinkingInfo from deps attribute
declared_inputs All files and directories that must be declared as action inputs

ToolInfo

ToolInfo(path, target)

Information about the native tool

FIELDS

Name Description
path Absolute path to the tool in case the tool is preinstalled on the machine. Relative path to the tool in case the tool is built as part of a build; the path should be relative to the bazel-genfiles, i.e. it should start with the name of the top directory of the built tree artifact. (Please see the example //examples:built_cmake_toolchain)
target If the tool is preinstalled, must be None. If the tool is built as part of the build, the corresponding build target, which should produce the tree artifact with the binary to call.

WrappedOutputs

WrappedOutputs(log_file, script_file, wrapper_script, wrapper_script_file)

Structure for passing the log and scripts file information, and wrapper script text.

FIELDS

Name Description
log_file Execution log file
script_file Main script file
wrapper_script Wrapper script text to execute
wrapper_script_file Wrapper script file (output for debugging purposes)

rules_foreign_cc_dependencies

rules_foreign_cc_dependencies(native_tools_toolchains, register_default_tools, cmake_version,
                              make_version, ninja_version, register_preinstalled_tools,
                              register_built_tools, additional_shell_toolchain_mappings,
                              additional_shell_toolchain_package)

Call this function from the WORKSPACE file to initialize rules_foreign_cc dependencies and let neccesary code generation happen (Code generation is needed to support different variants of the C++ Starlark API.).

PARAMETERS

Name Description Default Value
native_tools_toolchains pass the toolchains for toolchain types '@rules_foreign_cc//tools/build_defs:cmake_toolchain' and '@rules_foreign_cc//tools/build_defs:ninja_toolchain' with the needed platform constraints. If you do not pass anything, registered default toolchains will be selected (see below). []
register_default_tools If True, the cmake and ninja toolchains, calling corresponding preinstalled binaries by name (cmake, ninja) will be registered after 'native_tools_toolchains' without any platform constraints. The default is True. True
cmake_version The target version of the cmake toolchain if register_default_tools or register_built_tools is set to True. "3.19.6"
make_version The target version of the default make toolchain if register_built_tools is set to True. "4.3"
ninja_version The target version of the ninja toolchain if register_default_tools or register_built_tools is set to True. "1.10.2"
register_preinstalled_tools If true, toolchains will be registered for the native built tools installed on the exec host True
register_built_tools If true, toolchains that build the tools from source are registered True
additional_shell_toolchain_mappings Mappings of the shell toolchain functions to execution and target platforms constraints. Similar to what defined in @rules_foreign_cc//tools/build_defs/shell_toolchain/toolchains:toolchain_mappings.bzl in the TOOLCHAIN_MAPPINGS list. Please refer to example in @rules_foreign_cc//toolchain_examples. []
additional_shell_toolchain_package A package under which additional toolchains, referencing the generated data for the passed additonal_shell_toolchain_mappings, will be defined. This value is needed since register_toolchains() is called for these toolchains. Please refer to example in @rules_foreign_cc//toolchain_examples. None