(C++ modules) cleanup module rules

1 files changed, 58 insertions, 0 deletions

diff --git a/xmake/rules/c++/modules/config.lua b/xmake/rules/c++/modules/config.lua
new file mode 100644
index 000000000..a39e4c4e0
--- /dev/null
+++ b/xmake/rules/c++/modules/config.lua
@@ -0,0 +1,58 @@
+--!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, Arthapz
+-- @file        config.lua
+--
+
+import("support")
+    
+function main(target)
+
+    -- we disable to build across targets in parallel, because the source files may depend on other target modules
+    -- @see https://github.com/xmake-io/xmake/issues/1858
+    if support.contains_modules(target) then
+        -- @note this will cause cross-parallel builds to be disabled for all sub-dependent targets,
+        -- even if some sub-targets do not contain C++ modules.
+        --
+        -- maybe we will have a more fine-grained configuration strategy to disable it in the future.
+        target:set("policy", "build.fence", true)
+
+        -- disable ccache for this target
+        --
+        -- Caching can affect incremental compilation, for example
+        -- by interfering with the results of depfile generation for msvc.
+        --
+        -- @see https://github.com/xmake-io/xmake/issues/3000
+        target:set("policy", "build.ccache", false)
+
+        -- load compiler support
+        support.load(target)
+
+        -- mark this target with modules
+        target:data_set("cxx.has_modules", true)
+
+        -- moduleonly modules are implicitly public
+        if target:is_moduleonly() then
+            local sourcebatch = target:sourcebatches()["c++.build.modules.builder"]
+            if sourcebatch then
+                for _, sourcefile in ipairs(sourcebatch.sourcefiles) do
+                    target:fileconfig_add(sourcefile, {public = true})
+                end
+            end
+        end
+    end
+end