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# Copyright 2019 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.
# Generates a host Linux gcc toolchain for a specific target.
#
# Args:
# toolchain_cflags: Additional C/C++ compiler flags for the target.
# toolchain_ldflags: Additional linker flags for the target.
template("host_gcc") {
_cflags_list = [
# Colorize output. Ninja's GCC invocation disables color by default.
"-fdiagnostics-color",
# Disable obnoxious ABI warning.
#
# GCC 7.1 adds an over-zealous ABI warning with little useful information
# on how to resolve the issue. The warning you get is:
#
# note: parameter passing for argument of type '...' changed in GCC 7.1
#
# There is no other information, and searching for the error is needed to
# understand what is happening. For upstream Pigweed, we compile from
# source so this is irrelevant; so disable it.
#
# See: https://gcc.gnu.org/gcc-7/changes.html (search for "psabi").
# https://gcc.gnu.org/ml/gcc/2017-05/msg00073.html
"-Wno-psabi",
]
if (defined(invoker.toolchain_cflags)) {
_cflags_list += invoker.toolchain_cflags
}
_toolchain_cflags = string_join(" ", _cflags_list)
# Specify the default C++ version, which targets can override with a config.
_toolchain_cflags_cc = "-std=c++17 -Wno-register"
_toolchain_ldflags = ""
if (defined(invoker.toolchain_ldflags)) {
foreach(flag, invoker.toolchain_ldflags) {
_toolchain_ldflags += " " + flag
}
}
_ar = "ar"
_cc = "gcc"
_cxx = "g++"
toolchain(target_name) {
tool("asm") {
depfile = "{{output}}.d"
command = string_join(" ",
[
"$_cc",
"-MMD -MF $depfile",
_toolchain_cflags,
"{{defines}}",
"{{include_dirs}}",
"{{asmflags}}",
"-c {{source}}",
"-o {{output}}",
])
depsformat = "gcc"
description = "as {{output}}"
outputs = [
# Use {{source_file_part}}, which includes the extension, instead of
# {{source_name_part}} so that object files created from <file_name>.c
# and <file_name>.cc sources are unique.
"{{source_out_dir}}/{{target_output_name}}.{{source_file_part}}.o",
]
}
tool("cc") {
depfile = "{{output}}.d"
command = string_join(" ",
[
"$_cc",
"-MMD -MF $depfile",
_toolchain_cflags,
"{{defines}}",
"{{include_dirs}}",
"{{cflags}}",
"{{cflags_c}}",
"-c {{source}}",
"-o {{output}}",
])
depsformat = "gcc"
description = "cc {{output}}"
outputs = [
"{{source_out_dir}}/{{target_output_name}}.{{source_file_part}}.o",
]
}
tool("cxx") {
depfile = "{{output}}.d"
command = string_join(" ",
[
"$_cxx",
"-MMD -MF $depfile",
_toolchain_cflags_cc,
_toolchain_cflags,
"{{defines}}",
"{{include_dirs}}",
"{{cflags}}",
"{{cflags_cc}}",
"-c {{source}}",
"-o {{output}}",
])
depsformat = "gcc"
description = "c++ {{output}}"
outputs = [
"{{source_out_dir}}/{{target_output_name}}.{{source_file_part}}.o",
]
}
tool("alink") {
command = "rm -f {{output}} && $_ar rcs {{output}} {{inputs}}"
description = "ar {{target_output_name}}{{output_extension}}"
outputs = [
"{{target_out_dir}}/{{target_output_name}}{{output_extension}}",
]
default_output_extension = ".a"
}
lib_switch = "-l"
lib_dir_switch = "-L"
_link_outfile = "{{output_dir}}/{{target_output_name}}{{output_extension}}"
_link_flags = [
"$_cxx",
"{{ldflags}}",
_toolchain_cflags,
_toolchain_ldflags,
"{{inputs}}",
"{{libs}}",
"-o $_link_outfile",
]
_link_mapfile = "{{output_dir}}/{{target_output_name}}.map"
if (host_os == "mac") {
_link_flags += [
# Output a map file that shows symbols and their location.
"-Wl,-map,$_link_mapfile",
# Delete unreferenced sections. Helpful with -ffunction-sections.
"-Wl,-dead_strip",
]
} else {
_link_flags += [
# Output a map file that shows symbols and their location.
"-Wl,-Map,$_link_mapfile",
# Delete unreferenced sections. Helpful with -ffunction-sections.
"-Wl,--gc-sections",
]
}
_link_command = string_join(" ", _link_flags)
tool("link") {
command = _link_command
description = "ld $_link_outfile"
outputs = [
_link_outfile,
]
default_output_dir = "{{target_out_dir}}"
default_output_extension = ""
}
tool("solink") {
command = _link_command + " -shared"
description = "ld -shared $_link_outfile"
outputs = [
_link_outfile,
]
default_output_dir = "{{target_out_dir}}"
default_output_extension = ".so"
}
tool("stamp") {
if (host_os == "win") {
command = "cmd /c type nul > \"{{output}}\""
} else {
command = "touch {{output}}"
}
description = "stamp {{output}}"
}
tool("copy") {
command = "cp -af {{source}} {{output}}"
description = "cp {{source}} {{output}}"
}
}
}