点击状态栏build，会触发大量重新编译（可能与msvc的runtime有关）

[Wzshun]

Xmake 版本

2.8.3

操作系统版本和架构

windows10

描述问题

对应的源文件没改动，相关的编译flags也没改动。。但就会发现大量源文件重新编译。

可能的复现方法：
环境：

1. 使用msvc编译平台
2. 项目有使用库（内建库）
3. 新打开vscode，进行项目编译（或者切换下mode？）

使用--policies = "diagnosis.check_build_deps"查看改动。

如图所示，项目中未指定runtimes，按照xmake文档说明，默认都是走MT，但这里不知道为何出现了个MD的比较？

还有个类似的情况，切换成debug，出现MDd的比较？没保留截图。。

暂时较忙，未能提供复现demo，见谅。

期待的结果

尽可能少的重新编译。。太耗时了。。

工程配置

无

附加信息和错误日志

无

[waruqi]

加 -vD 看下 logs

然后 看下 xmake show -t target 看下 target 的配置

[Wzshun]

目前正在赶功能就不触发重编了。。-vD 晚些时候，我再写个复现demo吧。。

这是我目前的xmake show -t App 的信息，target比较多，也不清楚你想看那个target。

The information of target(App):
    at: E:\DevelopSpaces\Projects\QT5.6\vCanvasSln\vCanvas\src\App\xmake.lua
    kind: binary
    targetfile: build\windows\x64\debug\vCanvas.exe
    deps:
      -> UI -> .\src\App\xmake.lua:10
    rules:
      -> mode.release -> .\xmake.lua:10
      -> mode.debug -> .\xmake.lua:10
      -> qt.widgetapp -> .\src\App\xmake.lua:8
    links:
      -> CAD -> dep(vCanvas) -> packages
      -> CADViewer -> dep(vCanvas) -> packages
    ldflags:
      -> /subsystem:console -> .\src\App\xmake.lua:36
    frameworks:
      -> QtGui -> .\xmake.lua:39
      -> QtSvg -> dep(UI)
      -> QtWidgets -> dep(vCanvas)
    cflags:
      -> cl::/utf-8 -> .\xmake.lua:18
    cxxflags:
      -> cl::/utf-8 -> .\xmake.lua:19
      -> cl::/wd4819 -> .\xmake.lua:21
    linkdirs:
      -> E:\DevelopSpaces\Projects\IFA_Projects\vCanvasCoreSln\build\packages\c\cad\windows\x64\debug\lib -> dep(vCanvas) -> packages
      -> E:\DevelopSpaces\Projects\IFA_Projects\vCanvasCoreSln\build\packages\c\cad\windows\x64\release\lib -> dep(vCanvas) -> packages
      -> E:\DevelopSpaces\Projects\IFA_Projects\vCanvasCoreSln\build\packages\c\cadviewer\windows\x64\debug\lib -> dep(vCanvas) -> packages
    includedirs:
      -> build -> .\src\App\xmake.lua:18
      -> src\UI -> dep(UI)
      -> src\Libs\GCode -> dep(GCode)
      -> src\Libs\CAM -> dep(CAM)
      -> src\Libs\vCanvas -> dep(vCanvas)
    sysincludedirs:
      -> E:\DevelopSpaces\Projects\IFA_Projects\vCanvasCoreSln\build\packages\c\cad\windows\x64\debug\include -> dep(vCanvas) -> packages
      -> E:\DevelopSpaces\Projects\IFA_Projects\vCanvasCoreSln\build\packages\c\cadviewer\windows\x64\debug\include -> dep(vCanvas) -> packages
      -> E:\DevelopSpaces\Projects\IFA_Projects\vCanvasCoreSln\build\packages\c\cad\windows\x64\release\include -> dep(vCanvas) -> packages
    files:
      -> src\App\*.cpp -> .\src\App\xmake.lua:9
      -> src\App\app.rc -> .\src\App\xmake.lua:32
    compiler (mrc): C:\Program Files (x86)\Windows Kits\10\bin\10.0.17763.0\x64\rc.exe
      -> -nologo
    compiler (cxx): C:\Program Files (x86)\Windows Kits\10\bin\10.0.17763.0\x64\rc.exe
      -> -nologo
    linker (ld): I:\DevelopmentTools\VS2017\Enterprise\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\link.exe
      -> -nologo -dynamicbase -nxcompat -machine:x64
    compflags (mrc):
      -> -nologo -Ibuild -Isrc\UI -Isrc\Libs\vCanvas -Isrc\Libs\CAM -Isrc\Libs\GCode -IE:\DevelopSpaces\Projects\IFA_Projects\vCanvasCoreSln\build\packages\c\cad\windows\x64\debug\include -IE:\DevelopSpaces\Projects\IFA_Projects\vCanvasCoreSln\build\packages\c\cadviewer\windows\x64\debug\include -IE:\DevelopSpaces\Projects\IFA_Projects\vCanvasCoreSln\build\packages\c\cad\windows\x64\release\include
    compflags (cxx):
      -> -nologo -Ibuild -Isrc\UI -Isrc\Libs\vCanvas -Isrc\Libs\CAM -Isrc\Libs\GCode -IE:\DevelopSpaces\Projects\IFA_Projects\vCanvasCoreSln\build\packages\c\cad\windows\x64\debug\include -IE:\DevelopSpaces\Projects\IFA_Projects\vCanvasCoreSln\build\packages\c\cadviewer\windows\x64\debug\include -IE:\DevelopSpaces\Projects\IFA_Projects\vCanvasCoreSln\build\packages\c\cad\windows\x64\release\include
    linkflags (ld):
      -> -nologo -dynamicbase -nxcompat -machine:x64 -libpath:E:\DevelopSpaces\Projects\IFA_Projects\vCanvasCoreSln\build\packages\c\cad\windows\x64\debug\lib -libpath:E:\DevelopSpaces\Projects\IFA_Projects\vCanvasCoreSln\build\packages\c\cadviewer\windows\x64\debug\lib -libpath:E:\DevelopSpaces\Projects\IFA_Projects\vCanvasCoreSln\build\packages\c\cad\windows\x64\release\lib CADViewer.lib CAD.lib /subsystem:console