git - CMake ExternalProject_Add Git

Question

I have a git-bare-repository on my desktop and I would like to clone it with CMake. My repository has this path C:\Users\demoUser\Desktop\learnGIT\prog. My CMakeLists.txt looks like this:

cmake_minimum_required(VERSION 2.8)
project(Demo)
include(ExternalProject)

ExternalProject_Add(demo
  GIT_REPOSITORY C:/Users/demoUser/Desktop/learnGIT/prog
  GIT_TAG master
  UPDATE_COMMAND ""
  INSTALL_COMMAND ""
)

but in the generated folder prog-build is just wast. The generated folder structure doesn't include any of my files from the repository.

Does somebody has an idea?

score 6 · Accepted Answer

您的项目中必须有一个依赖于外部项目的目标
```
add_dependencies(TargetName ExternalProjectName)
```
git clone发生在构建TargetName 时（不是在 CMake 重新加载时）

score 0 · Accepted Answer

您必须告诉 cmake 它需要“演示”来构建您的目标。通过这种方式，您可以强制 cmake 在编译之前下载外部项目“demo”。

例如

set(SRC ${PROJECT_SOURCE_DIR}/src/main.cpp 
    ${PROJECT_SOURCE_DIR}/src/file1.cpp)  
    add_executable(Demobin ${SRC})  
    add_dependencies(Demobin demo)

score 0 · Accepted Answer

您将在此ANSWER中找到一个完整的示例。

当您（通过 git）添加外部项目时，在项目主要部分的构建开始之前获取（并构建）这些依赖项目有时很重要。

您可以通过将选项STEP_TARGETS build添加到ExternalProject_Add部分来实现此目的。见答案。

git - CMake ExternalProject_Add Git

3 回答 3

Related

Reference