cmake if or
时间: 2023-10-19 19:25:23 浏览: 49
在CMake中,你可以使用if或者elseif语句来执行条件判断。以下是一个示例:
```cmake
if(condition)
# 条件为真时执行的代码
elseif(condition2)
# condition为假而condition2为真时执行的代码
else()
# 所有条件都为假时执行的代码
endif()
```
在这个示例中,你可以根据条件的布尔值来指定要执行的代码块。如果第一个条件为真,则执行第一个代码块;如果第一个条件为假而第二个条件为真,则执行第二个代码块;如果所有条件都为假,则执行else代码块中的内容。
在实际使用中,你需要将`condition`和`condition2`替换为你自己的条件表达式。例如,你可以使用变量、函数返回值或其他比较表达式作为条件。
希望这能帮到你!如果还有其他问题,请随时提问。
相关问题
tesseract cmake
Tesseract is an open-source optical character recognition (OCR) engine. It is widely used for text recognition from images and scanned documents. CMake, on the other hand, is a cross-platform build system that helps in managing the build process of software projects.
To build Tesseract using CMake, you can follow these steps:
1. Install CMake: Download and install CMake from the official website (https://cmake.org/download/) based on your operating system.
2. Download Tesseract source code: Clone or download the Tesseract source code from the official GitHub repository (https://github.com/tesseract-ocr/tesseract).
3. Create a build directory: Create a separate directory to build Tesseract. This step is optional but recommended to keep the source code directory clean.
4. Configure the build: Open a terminal or command prompt, navigate to the build directory, and run the CMake configure command:
```
cmake /path/to/tesseract/source/code
```
Replace `/path/to/tesseract/source/code` with the actual path to the Tesseract source code directory.
5. Build Tesseract: After successful configuration, run the following command to build Tesseract:
```
cmake --build .
```
This command will start the build process using the default build tool for your platform (e.g., make on Linux, Visual Studio on Windows).
6. Install Tesseract (optional): If you want to install Tesseract system-wide, you can run the following command:
```
cmake --install .
```
This will install Tesseract and its dependencies on your system.
Note that these steps provide a general overview of building Tesseract using CMake. The actual commands may vary depending on your specific environment and requirements.
cmake BUILD_INTERFACE
CMake's `BUILD_INTERFACE` is a generator expression that is used to specify build-time dependencies or paths. It allows you to control the behavior of targets during the build process.
When using `BUILD_INTERFACE`, you can specify paths or include directories that are only relevant during the build phase of your project. These paths or directories will not be propagated to consuming projects when they link against your target.
For example, if you have a library target and you want to include some header files only during the build process, you can use `BUILD_INTERFACE` in conjunction with `target_include_directories()`. This ensures that the headers are only included when building your target, but not when using your library as a dependency.
Here's an example:
```cmake
target_include_directories(my_library
PUBLIC
$<INSTALL_INTERFACE:include>
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
)
```
In this example, `${CMAKE_CURRENT_SOURCE_DIR}/include` is included only during the build process, while `include` is included when using the installed library.
Note that `BUILD_INTERFACE` is evaluated during the configuration step, so any paths or dependencies specified with it should be available at configure time.