improve to fetch package for cross-compilation #4935

xmake/core/package/package.lua

@@ -1729,8 +1729,9 @@ end
 function _instance:_fetch_library(opt)
     opt = opt or {}
     local fetchinfo
+    local is_cross = self:is_cross()
     local on_fetch = self:script("fetch")
-    if on_fetch then
+    if on_fetch and not is_cross() then
         fetchinfo = on_fetch(self, {force = opt.force,
                                     system = opt.system,
                                     external = opt.external,
@@ -1947,7 +1948,7 @@ function _instance:fetch(opt)
             end
         end
 
-        -- fetch it from the system and external package sources (disabled for cross-compilation)
+        -- fetch it from the system and external package sources
         if not fetchinfo and system ~= false then
             fetchinfo = self:_fetch_library({system = true, require_version = require_ver, external = external, force = opt.force})
             if fetchinfo then

xmake/core/sandbox/modules/import/private/core/base/is_cross.lua

@@ -0,0 +1,23 @@
+--!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      ruki
+-- @file        is_cross.lua
+--
+
+return require("base/private/is_cross")
+
+

xmake/modules/package/manager/find_package.lua

@@ -23,6 +23,7 @@ import("core.base.semver")
 import("core.base.option")
 import("core.project.config")
 import("lib.detect.find_tool")
+import("private.core.base.is_cross")
 
 -- Is the current version matched?
 function _is_match_version(current_version, require_version)
@@ -53,37 +54,23 @@ function _find_package_with_builtin_rule(package_name, opt)
 
     -- find system package if be not disabled
     if opt.system ~= false then
-
-        -- find it from homebrew
-        if not is_host("windows") then
+        local plat = opt.plat
+        local arch = opt.arch
+        local find_from_host = not is_cross(plat, arch)
+        if find_from_host and not is_host("windows") then
             table.insert(managers, "brew")
         end
-
-        -- find it from vcpkg (support multi-platforms/architectures)
+        -- vcpkg/conan support multi-platforms/architectures
         table.insert(managers, "vcpkg")
-
-        -- find it from conan (support multi-platforms/architectures)
         table.insert(managers, "conan")
-
-        -- only support the current sub-host platform and sub-architecture, e.g. linux, macosx, or msys (subsystem)
-        local plat = opt.plat
-        local arch = opt.arch
-        if plat == os.subhost() and arch == os.subarch() then
-
-            -- find it from pkg-config
+        if find_from_host then
             table.insert(managers, "pkgconfig")
-
-            -- find it from pacman
             if is_subhost("linux", "msys") and plat ~= "windows" and find_tool("pacman") then
                 table.insert(managers, "pacman")
             end
-
-            -- find it from portage
             if is_subhost("linux", "msys") and plat ~= "windows" and find_tool("emerge") then
                 table.insert(managers, "portage")
             end
-
-            -- find it from system
             table.insert(managers, "system")
         end
     end