Improve rust to support cross build deps

tests/projects/rust/cargo_deps_cross_build/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "demo"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+spin = "^0.9"
+
+[target.'cfg(target_arch = "aarch64")'.dependencies]
+aarch64-cpu = "^9.3"

tests/projects/rust/cargo_deps_cross_build/src/main.rs

@@ -0,0 +1,10 @@
+// src/main.rs
+#![no_main]
+#![no_std]
+
+use core::panic::PanicInfo;
+
+#[panic_handler]
+fn panic(_panic: &PanicInfo<'_>) -> ! {
+    loop {}
+}

tests/projects/rust/cargo_deps_cross_build/xmake.lua

@@ -0,0 +1,14 @@
+-- rustup target add aarch64-unknown-none
+-- xmake f -a aarch64-unknown-none
+
+set_arch("aarch64-unknown-none")
+add_rules("mode.release", "mode.debug")
+add_requires("cargo::test", {configs = {
+    std = false,
+    main = false,
+    cargo_toml = path.join(os.projectdir(), "Cargo.toml")}})
+
+target("test")
+    set_kind("binary")
+    add_files("src/main.rs")
+    add_packages("cargo::test")

xmake/modules/package/manager/cargo/configurations.lua

@@ -22,8 +22,10 @@
 function main()
     return
     {
-        features         = {description = "set the features of dependency."},
-        default_features = {description = "enables or disables any defaults provided by the dependency.", default = true},
-        cargo_toml       = {description = "set Cargo.toml file path"}
+        features         = {description = "Set the features of dependency."},
+        default_features = {description = "Enable or disable any defaults provided by the dependency.", default = true},
+        std              = {description = "Enable or disable std module."},
+        main             = {description = "Enable or disable main entry function."},
+        cargo_toml       = {description = "Set Cargo.toml file path"}
     }
 end

xmake/modules/package/manager/cargo/find_package.lua

@@ -22,10 +22,12 @@
 import("core.base.option")
 import("core.base.semver")
 import("core.base.hashset")
+import("core.base.json")
 import("core.project.config")
 import("core.project.target")
 import("lib.detect.find_tool")
 import("lib.detect.find_file")
+import("private.tools.rust.check_target")
 
 -- get cargo registry directory
 function _get_cargo_registrydir()
@@ -82,30 +84,48 @@ function _get_libname(name)
 end
 
 -- get the name set of libraries
-function _get_names_of_libraries(name, configs)
+function _get_names_of_libraries(name, opt)
+    local configs = opt.configs or {}
     local names = hashset.new()
     if configs.cargo_toml then
-        local dependencies = false
-        local cargo_file = io.open(configs.cargo_toml)
-        for line in cargo_file:lines() do
-            line = line:trim()
-            if not dependencies and line == "[dependencies]" then
-                dependencies = true
-            elseif dependencies then
-                if not line:startswith("[") then
-                    local splitinfo = line:split("=", {plain = true})
-                    if splitinfo and #splitinfo > 1 then
-                        name = splitinfo[1]:trim()
-                        if #name > 0 then
-                            names:insert(_get_libname(name))
-                        end
-                    end
-                else
+        local cargo = assert(find_tool("cargo"), "cargo not found!")
+        local cargo_args = {"metadata", "--format-version", "1", "--manifest-path", configs.cargo_toml, "--color", "never"}
+        local target = check_target(opt.arch, true) and opt.arch or nil
+        if target then
+            table.insert(cargo_args, "--filter-platform")
+            table.insert(cargo_args, target)
+        end
+        if configs.features then
+            table.insert(cargo_args, "--features")
+            table.insert(cargo_args, table.concat(configs.features, ","))
+        end
+        if configs.default_features == false then
+            table.insert(cargo_args, "--no-default-features")
+        end
+
+        local output = os.iorunv(cargo.program, cargo_args)
+        local metadata = json.decode(output)
+
+        -- fetch the direct dependencies list regradless of the target platform
+        table.insert(cargo_args, "--no-deps")
+        output = os.iorunv(cargo.program, cargo_args)
+        local metadata_no_deps = json.decode(output)
+        -- FIXME: should consider the case of multiple packages in a workspace!
+        local direct_deps = metadata_no_deps.packages[1].dependencies
+
+        -- get the intersection of the direct dependencies and all dependencies for the target platform
+        for _, dep in ipairs(direct_deps) do
+            local dep_metadata
+            for _, pkg in ipairs(metadata.packages) do
+                if pkg.name == dep.name then
+                    dep_metadata = pkg
                     break
                 end
             end
+            if dep_metadata then
+                names:insert(_get_libname(dep.name))
+            end
         end
-        cargo_file:close()
     else
         names:insert(_get_libname(name))
     end
@@ -124,7 +144,7 @@ function main(name, opt)
     local configs = opt.configs or {}
 
     -- get names of libraries
-    local names = _get_names_of_libraries(name, configs)
+    local names = _get_names_of_libraries(name, opt)
     assert(not names:empty())
 
     local frameworkdirs

xmake/modules/package/manager/cargo/install_package.lua

@@ -22,6 +22,7 @@
 import("core.base.option")
 import("core.project.config")
 import("lib.detect.find_tool")
+import("private.tools.rust.check_target")
 
 -- install package
 --
@@ -52,6 +53,11 @@ function main(name, opt)
         require_version = "*"
     end
 
+    -- get target
+    -- e.g. x86_64-pc-windows-msvc, aarch64-unknown-none
+    -- @see https://github.com/xmake-io/xmake/issues/4049
+    local target = check_target(opt.arch, true) and opt.arch or nil
+
     -- generate Cargo.toml
     local sourcedir = path.join(opt.cachedir, "source")
     local cargotoml = path.join(sourcedir, "Cargo.toml")
@@ -86,12 +92,38 @@ function main(name, opt)
         tomlfile:close()
     end
 
+    -- generate .cargo/config.toml
+    local configtoml = path.join(sourcedir, ".cargo", "config.toml")
+    if target then
+        io.writefile(configtoml, format([[
+[build]
+target = "%s"
+]], target))
+    end
+
     -- generate main.rs
-    io.writefile(path.join(sourcedir, "src", "main.rs"), [[
-fn main() {
-    println!("Hello, world!");
-}
-    ]])
+    local file = io.open(path.join(sourcedir, "src", "main.rs"), "w")
+    if configs.main == false then
+        file:print("#![no_main]")
+    end
+    if configs.std == false then
+        file:print("#![no_std]")
+    end
+    if configs.main == false then
+        file:print([[
+    use core::panic::PanicInfo;
+
+    #[panic_handler]
+    fn panic(_panic: &PanicInfo<'_>) -> ! {
+        loop {}
+    }]])
+    else
+        file:print([[
+    fn main() {
+        println!("Hello, world!");
+    }]])
+    end
+    file:close()
 
     -- do build
     local argv = {"build"}
@@ -106,5 +138,9 @@ fn main() {
     -- do install
     local installdir = opt.installdir
     os.tryrm(path.join(installdir, "lib"))
-    os.vcp(path.join(sourcedir, "target", opt.mode == "debug" and "debug" or "release", "deps"), path.join(installdir, "lib"))
+    if target then
+        os.vcp(path.join(sourcedir, "target", target, opt.mode == "debug" and "debug" or "release", "deps"), path.join(installdir, "lib"))
+    else
+        os.vcp(path.join(sourcedir, "target", opt.mode == "debug" and "debug" or "release", "deps"), path.join(installdir, "lib"))
+    end
 end

xmake/modules/private/tools/rust/check_target.lua

@@ -0,0 +1,76 @@
+--!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, TBOOX Open Source Group.
+--
+-- @author      w568w
+-- @file        check_target.lua
+--
+
+-- imports
+import("lib.detect.find_tool")
+
+-- get rustc supported targets
+--
+-- @return          the supported target list. If rustc not found, return nil
+function _get_rustc_supported_target()
+    local rustc = find_tool("rustc")
+    if not rustc then
+        return nil
+    end
+    local output = os.iorunv(rustc.program, {"--print", "target-list"})
+    return output:split('\n')
+end
+
+-- check whether the target is supported by rustc
+--
+-- @param arch      the target name, e.g. x86_64-unknown-linux-gnu
+-- @param precise   whether to check the target precisely (i.e. check by rustc), otherwise only by syntax
+--
+-- @return          true if arch != nil and the target is supported by rustc, otherwise false
+function main(arch, precise)
+
+    if not arch then
+        return false
+    end
+
+    -- 1: check by syntax
+    local result = false
+    local archs = arch:split("%-")
+    if #archs >= 2 then
+        result = true
+    else
+        wprint("the arch \"%s\" is NOT a valid target triple, will be IGNORED and may cause compilation errors, please check it again", arch)
+    end
+
+    -- 2: check by rustc
+    if not precise then
+        return result
+    end
+    result = false
+    local rustc_supported_target = _get_rustc_supported_target()
+    if rustc_supported_target then
+        for _, v in ipairs(rustc_supported_target) do
+            if v == arch then
+                result = true
+                break
+            end
+        end
+        if not result then
+            wprint("the arch \"%s\" is NOT supported by rustc, will be IGNORED and may cause compilation errors, please check it again", arch)
+        end
+    end
+
+    return result
+end

xmake/toolchains/rust/xmake.lua

@@ -18,21 +18,24 @@
 -- @file        xmake.lua
 --
 
--- define toolchain
 toolchain("rust")
 
-    -- set homepage
     set_homepage("https://www.rust-lang.org/")
     set_description("Rust Programming Language Compiler")
 
-    -- set toolset
     set_toolset("rc",   "$(env RC)", "rustc")
     set_toolset("rcld", "$(env RC)", "rustc")
     set_toolset("rcsh", "$(env RC)", "rustc")
     set_toolset("rcar", "$(env RC)", "rustc")
 
-    -- on load
     on_load(function (toolchain)
-        toolchain:set("rcshflags", "")
-        toolchain:set("rcldflags", "")
+        -- e.g. x86_64-pc-windows-msvc, aarch64-unknown-none
+        local arch = toolchain:arch()
+        if arch and #arch:split("%-") > 1 then
+            toolchain:add("rcshflags", "--target=" .. arch)
+            toolchain:add("rcldflags", "--target=" .. arch)
+        else
+            toolchain:set("rcshflags", "")
+            toolchain:set("rcldflags", "")
+        end
     end)

xmake/toolchains/xcode/load_macosx.lua

@@ -78,7 +78,8 @@ function main(toolchain)
     -- init flags for c/c++
     toolchain:add("ldflags", "-stdlib=libc++")
     toolchain:add("shflags", "-stdlib=libc++")
-    toolchain:add("syslinks", "z")
+    toolchain:add("ldflags", "-lz")
+    toolchain:add("shflags", "-lz")
 
     -- init flags for objc/c++ (with ldflags and shflags)
     -- we can use `add_mxflags("-fno-objc-arc")` to override it in xmake.lua