在CMake中如何创建具有相同名称的目标？ [英] In CMake how to create targets with identical names?

问题描述

我对 CMake 有疑问，我需要帮助来解决以下错误：

I have a question regarding CMake and I need help to solve the following error I'm getting:

CMake Error at :::: (add_custom_target):
  add_custom_target cannot create target "generate" because another target
  with the same name already exists.  The existing target is a custom target
  created in source directory :::::.

这里是两个相同级别的目标名称 CMakeLists.txt 是相同的，我想保持它们相同，没有任何冲突。有人可以帮我吗？

Here the target names of the two same level CMakeLists.txt are the same and I want to keep them identical, without any conflict. Can anyone help me out?

推荐答案

根据CMake政策 CMP0002 （由CMake 2.6引入，重点是我的）：

According with CMake policy CMP0002 (introduced by CMake 2.6, emphasis mine):

使用 add_executable，add_library或 add_custom_target 创建的目标名称是逻辑构建目标名称。逻辑目标名称必须是全局唯一的 [...]

Targets names created with add_executable, add_library, or add_custom_target are logical build target names. Logical target names must be globally unique [...]

以下注释值得一提，并且可以可能仍然可以帮助您：

The following note deserves a mention and could probably help you anyway:

自定义目标必须简单地具有全局唯一名称（除非有人使用全局属性 ALLOW_DUPLICATE_CUSTOM_TARGETS 和Makefiles生成器。）

Custom targets must simply have globally unique names (unless one uses the global property ALLOW_DUPLICATE_CUSTOM_TARGETS with a Makefiles generator).

这意味着存在一个名为 ALLOW_DUPLICATE_CUSTOM_TARGETS 正在找。它用途有限，您应该仔细阅读文档，但是值得一试。

最相关的部分如下：

It means that there exists a global property named ALLOW_DUPLICATE_CUSTOM_TARGETS that is probably what you are looking for. It has a limited use and you should read carefully the documentation, but it's worth a try.
The most relevant part follows:

Makefile生成器能够支持重复的自定义目标名称。 [...]但是，设置此属性将导致非Makefile生成器产生错误并拒绝生成项目。

Makefile generators are capable of supporting duplicate custom target names. [...] However, setting this property will cause non-Makefile generators to produce an error and refuse to generate the project.

为了能够使用重复的自定义目标，请将以下行放入您的 CMakeLists.txt ：

To be able to use duplicate custom targets put the following line in your CMakeLists.txt:

set(ALLOW_DUPLICATE_CUSTOM_TARGETS TRUE)

如果能解决您的问题，主要取决于实际问题，所以我不能说。

If it solves your issue mainly depends on the actual problem, so I cannot say.

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