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--!A cross-platform build utility based on Lua
--
-- 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
--
-- http://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.
--
-- Copyright (C) 2015-present, Xmake Open Source Community.
--
-- @author ruki
-- @file optimization.lua
--
-- imports
import("core.tool.compiler")
import("core.project.project")
-- add lto optimization
function _add_lto_optimization(target, sourcekind)
-- add cflags
local _, cc = target:tool(sourcekind)
local flagnames = {
cc = "cflags",
cxx = "cxxflags",
mm = "mflags",
mxx = "mxxflags"
}
local cflag = flagnames[sourcekind] or (sourcekind == "cxx" and "cxxflags" or "cflags")
if cc == "cl" then
target:add(cflag, "-GL")
elseif cc == "clang" or cc == "clangxx" or cc == "clang_cl" or cc:startswith("zig") then
target:add(cflag, "-flto=thin")
elseif cc == "gcc" or cc == "gxx" then
target:add(cflag, "-flto")
end
-- add ldflags and shflags
local _, ld = target:tool("ld")
if ld == "link" then
target:add("ldflags", "-LTCG")
target:add("shflags", "-LTCG")
elseif ld == "clang" or ld == "clangxx" or ld:startswith("zig") then
target:add("ldflags", "-flto=thin")
target:add("shflags", "-flto=thin")
-- On Darwin, when using -flto along with -g and compiling and linking in separate steps,
-- you also need to pass -Wl,-object_path_lto,<lto-filename>.o at the linking step to instruct
-- the ld64 linker not to delete the temporary object file generated during Link Time Optimization
-- (this flag is automatically passed to the linker by Clang if compilation and linking are done in a single step).
--
-- This allows debugging the executable as well as generating the .dSYM bundle using dsymutil(1).
--
-- @see https://github.com/xmake-io/xmake/issues/7029
-- https://clang.llvm.org/docs/CommandGuide/clang.html
if target:is_plat("macosx", "iphoneos", "watchos") then
local targetfile = target:targetfile()
if targetfile then
local lto_objectfile = target:objectfile(targetfile .. ".lto")
target:add("ldflags", "-Wl,-object_path_lto," .. lto_objectfile)
target:add("shflags", "-Wl,-object_path_lto," .. lto_objectfile)
end
end
elseif ld == "gcc" or ld == "gxx" then
target:add("ldflags", "-flto")
target:add("shflags", "-flto")
-- to use the link-time optimizer, -flto and optimization options should be specified at compile time and during the final link.
-- @see https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
local optimize = target:get("optimize")
if optimize then
local lang_map = {
cc = "c",
cxx = "cxx",
mm = "c",
mxx = "cxx"
}
local lang = lang_map[sourcekind] or "cxx"
local optimize_flags = compiler.map_flags(lang, "optimize", optimize)
target:add("ldflags", optimize_flags)
target:add("shflags", optimize_flags)
end
end
local _, ar = target:tool("ar")
if cc == "clang_cl" then
if ld == "link" then
wprint([[Unsupported toolset(%s) for lto, please use `set_toolset("ld", "lld-link")`]], ld)
target:set("toolset", "ld", "lld-link")
target:set("toolset", "sh", "lld-link")
end
if ar ~= "llvm-ar" and ar ~= "llvm_ar" then
wprint([[Unsupported toolset(%s) for lto, please use `set_toolset("ar", "llvm-ar")`]], ar)
target:set("toolset", "ar", "llvm-ar")
end
end
end
-- main entry
function main(target, sourcekind)
-- handle lto optimization
if target:policy("build.optimization.lto") or project.policy("build.optimization.lto") then
_add_lto_optimization(target, sourcekind)
end
end
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