CMake：在脚本中打印出所有可访问的变量

Question

我想知道是否有办法在CMake中打印出所有可访问的变量。我对CMake变量不感兴趣 - 就像在--help-variables选项中一样。我在谈论我定义的变量，或者包含脚本定义的变量。

我目前正在加入

INCLUDE (${CMAKE_ROOT}/Modules/CMakeBackwardCompatibilityCXX.cmake)

我希望我能打印出这里的所有变量，而不是必须浏览所有文件并阅读可用内容 - 我可能会发现一些我不知道的变量可能有用。帮助学习和帮助是好的。发现。它严格用于调试/开发。

这类似于 Print all local variables accessible to the current scope in Lua 中的问题，但是对于CMake来说！

有没有人这样做过？

Answer 1

使用get_cmake_property函数，以下循环将打印出定义的所有CMake变量及其值：

get_cmake_property(_variableNames VARIABLES)
list (SORT _variableNames)
foreach (_variableName ${_variableNames})
    message(STATUS "${_variableName}=${${_variableName}}")
endforeach()

要打印环境变量，请使用CMake的command mode：

execute_process(COMMAND "${CMAKE_COMMAND}" "-E" "environment")

Answer 2

另一种方法是简单地使用：

cmake -LAH

来自manpage：

  

-L[A][H]

     

列出非高级缓存变量。

     

列表缓存变量将运行CMake并列出CMake缓存中未标记为INTERNAL或ADVANCED的所有变量。这将有效地显示当前的CMake设置[...]。

     

如果指定了A，那么它也会显示高级变量。

     

如果指定了H，它还将显示每个变量的帮助。

Answer 3

ccmake 是交互式检查缓存变量（option(或set( CACHE的良好互动选项：

sudo apt-get install cmake-curses-gui
mkdir build
cd build
cmake ..
ccmake ..

Answer 4

基于@sakra

/**
 * send_body___receive_response.js
 *
 * Can of-course be in <script> tags in HTML or PHP
 */

async function postData( url='', data={ } ) {
  // *starred options in comments are default values
  const response = await fetch(
    url,
    {
      method: "POST", // *GET, POST, PUT, DELETE, etc.
      mode: "same-origin", // no-cors, *cors, same-origin
      cache: 'no-cache', // *default, no-cache, reload, force-cache, only-if-cached
      credentials: "same-origin", // include, *same-origin, omit
      headers: {
        "Content-Type": "application/json",  // sent request
        "Accept":       "application/json"   // expected data sent back
      },
      redirect: 'follow', // manual, *follow, error
      referrerPolicy: 'no-referrer', // no-referrer, *no-referrer-when-downgrade, origin, origin-when-cross-origin, same-origin, strict-origin, strict-origin-when-cross-origin, unsafe-url
      body: JSON.stringify( data ), // body data type must match "Content-Type" header
    },
  );

  return response.json( ); // parses JSON response into native JavaScript objects
}

const data = {
  'key1': 'value1',
  'key2': 'value2'
};

postData( 'receive_body___send_response.php', JSON.stringify( data ) )
  .then( response => {
    // Manipulate response here
    console.log( "response: ", response ); // JSON data parsed by `data.json()` call
    // In this case where I send entire $decoded from PHP you could arbitrarily use this
    console.log( "response.data: ", JSON.parse( response.data ) );
  } );

变量名称区分大小写

如果您对Boost感兴趣，那就是/** * receive_body___send_response.php */ $contentType = isset($_SERVER["CONTENT_TYPE"]) ? trim($_SERVER["CONTENT_TYPE"]) : ''; // Set initial response $response = [ 'value' => 0, 'error' => 'Nothing happened', 'data' => null, ]; if ($contentType === "application/json") { // Receive the RAW post data. $content = trim(file_get_contents("php://input")); // $decoded can be used the same as you would use $_POST in $.ajax $decoded = json_decode($content, true); if(! is_array($decoded)) { // NOTE: Sometimes for some reason I have to add the next line as well /* $decoded = json_decode($decoded, true); */ // Do something with received data and include it in reponse /* perhaps database manipulation here */ $response['data'] = $decoded; // Success $response['value'] = 1; $response['error'] = null; } else { // The JSON is invalid. $response['error'] = 'Received JSON is improperly formatted'; } } else { // Content-Type is incorrect $response['error'] = 'Content-Type is not set as "application/json"'; } // echo response for fetch API echo json_encode($response); 而不是function(dump_cmake_variables) get_cmake_property(_variableNames VARIABLES) list (SORT _variableNames) foreach (_variableName ${_variableNames}) if (ARGV0) unset(MATCHED) #case sensitive match # string(REGEX MATCH ${ARGV0} MATCHED ${_variableName}) # #case insenstitive match string( TOLOWER "${ARGV0}" ARGV0_lower ) string( TOLOWER "${_variableName}" _variableName_lower ) string(REGEX MATCH ${ARGV0_lower} MATCHED ${_variableName_lower}) if (NOT MATCHED) continue() endif() endif() message(STATUS "${_variableName}=${${_variableName}}") endforeach() endfunction() dump_cmake_variables("^Boost") ，它是Boost_INCLUDE_DIRS而不是BOOST_INCLUDE_DIRS，并且错误地我使用了BOOST_LIBRARIES而不是Boost_LIBRARIES， https://cmake.org/cmake/help/v3.0/module/FindBoost.html，是增强效果的更好示例：

Boost_LIBRARIES

Answer 5

查看所有cmake内部变量的另一种方法是通过使用--trace-expand选项执行cmake。

这将使您跟踪所有已执行的.cmake文件以及在每一行上设置的变量。

Answer 6

您可以使用 message :

message([STATUS] "SUB_SOURCES : ${SUB_SOURCES}")

Answer 7

当前的所有答案都不允许我看到项目子目录中的变量。这是一个解决方案：

function(print_directory_variables dir)
    # Dump variables:
    get_property(_variableNames DIRECTORY ${dir} PROPERTY VARIABLES)
    list (SORT _variableNames)
    foreach (_variableName ${_variableNames})
        get_directory_property(_variableValue DIRECTORY ${dir} DEFINITION ${_variableName})
        message(STATUS "DIR ${dir}: ${_variableName}=${_variableValue}")
    endforeach()
endfunction(print_directory_variables)

# for example
print_directory_variables(.)
print_directory_variables(ui/qt)