是否将PreBuildEvent转换为有条件的目标? [英] Convert a PreBuildEvent to a Target with a Condition?

问题描述

我有一个名为cryptdll.vcxproj的项目. cryptdll 取决于解决方案中其他两个项目的构件.其他项目是 cryptlib 和 cryptest .对于那些对 cryptdll 中的元素布局感兴趣的人，它位于

I have a project called cryptdll.vcxproj. cryptdll depends on artifacts from two other projects in the solution. The other projects are cryptlib and cryptest. For those interested in the layout of elements in cryptdll, it is located at cryptdll.

依赖关系有些不寻常，在Visual Studio编辑器中不容易表达.它们不常见，因为策略要求Win32\Output\Debug\cryptest.exe始终用于执行PostBuildEvent cryptdll .

The dependencies are somewhat unusual and not easily expressed in the Visual Studio editor. They are unusual because policy requires Win32\Output\Debug\cryptest.exe always be used to perform a PostBuildEvent cryptdll.

我发现我可以将以下内容添加到 cryptdll 中，以使事情按预期工作:

I found I could add the following to cryptdll to get things working as expected:

<!-- Win32/Debug cryptest.exe for DLL MAC'ing -->
<ItemDefinitionGroup Condition="!Exists('Win32\Output\Debug\cryptest.exe')" Label="MAC tool">
  <PreBuildEvent>
    <Message>Creating Win32/Debug cryptest.exe for MAC computation</Message>
    <Command>
      msbuild /t:Build /p:Configuration=Debug;Platform=Win32 cryptlib.vcxproj
      msbuild /t:Build /p:Configuration=Debug;Platform=Win32 cryptest.vcxproj
    </Command>
  </PreBuildEvent>
</ItemDefinitionGroup>

当我尝试将其转换为目标时，它停止工作.下面是目标规则.

When I attempted to convert it to a Target it stopped working. Below is the target rule.

<!-- Win32/Debug cryptest.exe for DLL MAC'ing -->
<Target Condition="!Exists('Win32\Output\Debug\cryptest.exe')" Name="MAC tool" Label="MAC tool">
  <MSbuild
    Projects="cryptlib.vcxproj"
    Properties="Configuration=Debug;Platform=Win32;"/>
  <MSbuild
    Projects="cryptest.vcxproj"
    Properties="Configuration=Debug;Platform=Win32;"/>
</Target>

我的问题是，转换为目标的代码有什么问题，我该如何解决?

My question is, what is wrong with the code converted to a Target, and how do I fix it?

出于完整性考虑，我想要Makefile人士所说的 先决条件 .我可以从搜索中得知，"MSBuild前提条件" 的每个结果都不相关

For completeness, I want what the Makefile folks call a Prerequisite. The best I can tell from searching, every result for "MSBuild prerequisite" is irrelevant.

这是目标输出的样子.请注意，该任务被跳过，就好像它不存在一样.

Here is what the Target'd output looks like. Notice the task is skipped as if it did not exist.

>del /q /s Win32 x64
...

>msbuild /t:build /p:Configuration=Release;Platform=x64 cryptdll.vcxproj
Microsoft (R) Build Engine version 4.6.1055.0

Build started 10/6/2016 11:40:26 AM.
Project "c:\cryptopp\cryptdll.vcxproj" on node 1 (build target(s)).
PrepareForBuild:
  Creating directory "x64\cryptdll\Release\".
  Creating directory "x64\DLL_Output\Release\".
InitializeBuildStatus:
  Creating "x64\cryptdll\Release\cryptdll.unsuccessfulbuild" because "AlwaysCre
  ate" was specified.
CustomBuild:
  Performing Custom Build Tools
   Assembling: c:\cryptopp\x64dll.asm
ClCompile:
  c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin\AMD64\CL.exe /c /Z
  i /nologo /W4 /WX- /O2 /Ob2 /Oi /Oy /D NDEBUG /D CRYPTOPP_EXPORTS /D CRYPTOPP
  _ENABLE_COMPLIANCE_WITH_FIPS_140_2=1 /D USE_PRECOMPILED_HEADERS /D _WINDLL /G
  F /Gm- /EHsc /MT /GS /Gy /fp:precise /Zc:wchar_t /Zc:forScope /Yc"pch.h" /Fp"
  x64\cryptdll\Release\cryptopp.pch" /Fo"x64\cryptdll\Release\\" /Fd"x64\cryptd
  ll\Release\vc100.pdb" /Gd /TP /errorReport:none pch.cpp
  pch.cpp
  ...

  <rest of the DLL is built>

PostBuildEvent:
  Description: Adding MAC to DLL

          Win32\output\debug\cryptest.exe mac_dll "cryptopp\x64\DLL_Output\Rele
  ase\cryptopp.dll"
          IF %ERRORLEVEL% EQU 0 (echo mac done > "x64\DLL_Output\Release\"\cryp
  topp.mac.done)

  :VCEnd
  The system cannot find the path specified.
C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\Microsoft.CppCommon.targets(1
13,5): error MSB3073: The command "\r [c:\cryptopp\cryptdll.vcxproj]
C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\Microsoft.CppCommon.targets(1
13,5): error MSB3073:         Win32\output\debug\cryptest.exe mac_dll "c:\crypt
opp\x64\DLL_Output\Release\cryptopp.dll"\r [c:\cryptopp\cryptdll.vcxproj]
C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\Microsoft.CppCommon.targets(1
13,5): error MSB3073:         IF %ERRORLEVEL% EQU 0 (echo mac done > "x64\DLL_O
utput\Release\"\cryptopp.mac.done)\r [c:\cryptopp\cryptdll.vcxproj]
C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\Microsoft.CppCommon.targets(1
13,5): error MSB3073:       \r [c:\cryptopp\cryptdll.vcxproj]
C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\Microsoft.CppCommon.targets(1
13,5): error MSB3073: :VCEnd" exited with code 3. [c:\cryptopp\cryptdll.vcxproj
Done Building Project "c:\cryptopp\cryptdll.vcxproj" (build target(s)) -- FAILE
D.

Build FAILED.

推荐答案

当我尝试将其转换为Task 时，您的意思是

When I attempted to convert it to a Task You mean a Target, that is not the same as a Task: the first contains the latter.

请注意，该任务好像不存在一样被跳过.您不会在任何地方告诉msbuild对目标的处理，因此它可能不知道何时调用它.您希望在构建之前调用它，因此您必须以某种方式表示它.在这里，BeforeTargets属性(与上述链接相同的文档中的内容)是规范的方式:

Notice the task is skipped as if it did not exist. Well you don't tell msbuild anywhere what to do with the target so it cannot possibly know when to invoke it. You want it called before the build so you must express that somehow. Here, the BeforeTargets attribute (documentation in same link above) is the canonical way:

<Target Condition="!Exists('Win32\Output\Debug\cryptest.exe')"
        Name="MAC tool"
        BeforeTargets="Build">

边注:为什么要在仅复制名称的目标上添加标签?

sidenote: why bother adding a Label to a target which just duplicates the name?

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