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StoneThrow
Asked: 2024-02-06 02:43:09 +0800 CST

CMakePresets.json configurePreset 可以强制执行其条件和继承的条件吗？

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以下 CMakePresets.json 演示了如何强制使用 configurePresets 条件设置环境变量：

{
  "version": 3,
  "cmakeMinimumRequired": {
    "major": 3,
    "minor": 20
  },
  "configurePresets": [
    {
      "name": "fail_if_no_foo",
      "displayName": "Fail if no FOO",
      "description": "Demo failing if environment variable FOO is unset",
      "binaryDir": "${sourceDir}/build",
      "generator": "Unix Makefiles",
      "condition": {
        "type": "notEquals",
        "lhs": "$penv{FOO}",
        "rhs": ""
      }
    }
  ]
}

$ cmake --preset fail_if_no_foo
CMake Error: Could not use disabled preset "fail_if_no_foo"
$ FOO=bar cmake --preset fail_if_no_foo
-- Configuring done
-- Generating done
-- Build files have been written to: /home/user/dev/cmake_learn/preset_condition/build
$

下面的修改表明条件可以被继承：

{
  "version": 3,
  "cmakeMinimumRequired": {
    "major": 3,
    "minor": 20
  },
  "configurePresets": [
    {
      "name": "fail_if_no_foo",
      "displayName": "Fail if no FOO",
      "description": "Demo failing if environment variable FOO is unset",
      "binaryDir": "${sourceDir}/build",
      "generator": "Unix Makefiles",
      "condition": {
        "type": "notEquals",
        "lhs": "$penv{FOO}",
        "rhs": ""
      }
    },
    {
      "name": "inherited_preset",
      "inherits": "fail_if_no_foo",
      "displayName": "Inherited fail if no FOO",
      "description": "Demo inherited condition to fail if environment variable FOO is unset"
    }
  ]
}

$ cmake --preset inherited_preset
CMake Error: Could not use disabled preset "inherited_preset"
$ FOO=bar cmake --preset inherited_preset
-- Configuring done
-- Generating done
-- Build files have been written to: /home/user/dev/cmake_learn/preset_condition/build
$

但是，如果继承的 conditionPresets 引入了自己的条件，则父条件的继承似乎就会消失：

{
  "version": 3,
  "cmakeMinimumRequired": {
    "major": 3,
    "minor": 20
  },
  "configurePresets": [
    {
      "name": "fail_if_no_foo",
      "displayName": "Fail if no FOO",
      "description": "Demo failing if environment variable FOO is unset",
      "binaryDir": "${sourceDir}/build",
      "generator": "Unix Makefiles",
      "condition": {
        "type": "notEquals",
        "lhs": "$penv{FOO}",
        "rhs": ""
      }
    },
    {
      "name": "inherited_preset",
      "inherits": "fail_if_no_foo",
      "displayName": "Inherited fail if no FOO",
      "description": "Demo inherited condition to fail if environment variable FOO is unset",
      "condition": {
        "type": "equals",
        "lhs": "${hostSystemName}",
        "rhs": "Linux"
      }
    }
  ]
}

$ uname -s
Linux
$ cmake --preset inherited_preset
-- Configuring done
-- Generating done
-- Build files have been written to: /home/user/dev/cmake_learn/preset_condition/build
$

有没有办法在当前configurePreset中实现的条件与继承的configurePreset中的条件之间实现“与”关系？
我想强制执行“Linux”并且父环境定义的inherited_preset条件。 CMake Presets 文档注释了一个关键字，但没有给出如何使用它的示例，而且我还没有弄清楚如何使用它来实现我的需求。${hostSystemName}FOO
allOf

以下是我从文档中解释如何使用的两次尝试allOf：

{
  "version": 3,
  "cmakeMinimumRequired": {
    "major": 3,
    "minor": 20
  },
  "configurePresets": [
    {
      "name": "fail_if_no_foo",
      "displayName": "Fail if no FOO",
      "description": "Demo failing if environment variable FOO is unset",
      "binaryDir": "${sourceDir}/build",
      "generator": "Unix Makefiles",
      "condition": {
        "allOf": {
          "conditions": [
            {
              "type": "notEquals",
              "lhs": "$penv{FOO}",
              "rhs": ""
            }
          ]
        }
      }
    },
    {
      "name": "inherited_preset",
      "inherits": "fail_if_no_foo",
      "displayName": "Inherited fail if no FOO",
      "description": "Demo inherited condition to fail if environment variable FOO is unset",
      "condition": {
        "type": "equals",
        "lhs": "${hostSystemName}",
        "rhs": "Linux"
      }
    }
  ]
}

{
  "version": 3,
  "cmakeMinimumRequired": {
    "major": 3,
    "minor": 20
  },
  "configurePresets": [
    {
      "name": "fail_if_no_foo",
      "displayName": "Fail if no FOO",
      "description": "Demo failing if environment variable FOO is unset",
      "binaryDir": "${sourceDir}/build",
      "generator": "Unix Makefiles",
      "condition": {
        "allOf": {
          "conditions": [
            {
              "type": "notEquals",
              "lhs": "$penv{FOO}",
              "rhs": ""
            }
          ]
        }
      }
    },
    {
      "name": "inherited_preset",
      "inherits": "fail_if_no_foo",
      "displayName": "Inherited fail if no FOO",
      "description": "Demo inherited condition to fail if environment variable FOO is unset",
      "condition": {
        "allOf": {
          "conditions": [
            {
              "type": "equals",
              "lhs": "${hostSystemName}",
              "rhs": "Linux"
            }
          ]
        }
      }
    }
  ]
}

...但是两次尝试都因相同的错误而解析失败：

$ cmake --preset fail_if_no_foo
CMake Error: Could not read presets from /home/user/dev/cmake_learn/preset_condition: Invalid preset condition

更新：我认为我在之前尝试使用allOf. 以下尝试进行解析，但仍然无法实现强制执行子级和父级条件的所需行为：

{
  "version": 3,
  "cmakeMinimumRequired": {
    "major": 3,
    "minor": 20
  },
  "configurePresets": [
    {
      "name": "fail_if_no_foo",
      "displayName": "Fail if no FOO",
      "description": "Demo failing if environment variable FOO is unset",
      "binaryDir": "${sourceDir}/build",
      "generator": "Unix Makefiles",
      "condition": {
        "type": "allOf",
        "conditions": [
          {
            "type": "notEquals",
            "lhs": "$penv{FOO}",
            "rhs": ""
          }
        ]
      }
    },
    {
      "name": "inherited_preset",
      "inherits": "fail_if_no_foo",
      "displayName": "Inherited fail if no FOO",
      "description": "Demo inherited condition to fail if environment variable FOO is unset",
      "condition": {
        "type": "allOf",
        "conditions": [
          {
            "type": "equals",
            "lhs": "${hostSystemName}",
            "rhs": "Linux"
          }
        ]
      }
    }
  ]
}

$ cmake --preset fail_if_no_foo
CMake Error: Could not use disabled preset "fail_if_no_foo"
$ FOO=bar cmake --preset fail_if_no_foo
-- Configuring done
-- Generating done
-- Build files have been written to: /home/user/dev/cmake_learn/preset_condition/build
$ cmake --preset inherited_preset
-- Configuring done
-- Generating done
-- Build files have been written to: /home/user/dev/cmake_learn/preset_condition/build
$
cmake

1 个回答

  1. Best Answer

    在我看来，您想要的是开放功能请求预设中所要求的：条件预设的继承，它要求不是仅在所有继承完成后才评估条件的效果，而是评估每个继承的效果在继承发生之前在继承树中预设。我建议您对该问题票竖起大拇指以表示支持。您还可以订阅它以获取有关讨论和进展的通知。请避免在那里发表嘈杂的评论，比如只包含“+1”/“bump”的评论。

    • 1

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