Fix cmake.installPrefix not being passed to CMake when using presets

[Copilot]

This change addresses item #4358

This changes visible behavior

The following changes are proposed:

• Move installPrefix expansion in _refreshExpansions() out of the if (!this.useCMakePresets) block so this._installDir is populated regardless of preset usage
• Add CMAKE_INSTALL_PREFIX to generateConfigArgsFromPreset(), following the same precedence pattern as CMAKE_EXPORT_COMPILE_COMMANDS: preset cacheVariables > configureArgs > cmake.installPrefix setting
• Include installPrefix in checkConfigureOverridesPresent() so the override notification fires when this setting is active with presets

The purpose of this change

cmake.installPrefix was silently ignored when using presets because:

1. _refreshExpansions() only expanded it inside the non-preset branch, leaving _installDir null
2. generateConfigArgsFromPreset() never read installDir to emit -DCMAKE_INSTALL_PREFIX

The non-preset path in generateConfigArgsFromSettings() → generateCMakeSettingsFlags() already handled this correctly.

Other Notes/Information

Precedence (highest → lowest):

1. Preset's cacheVariables.CMAKE_INSTALL_PREFIX
2. -DCMAKE_INSTALL_PREFIX in cmake.configureArgs
3. cmake.installPrefix VS Code setting

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

• 2wrvsblobprodwus2180.vsblob.vsassets.io
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node /usr/local/bin/yarn install (dns block)
• 40vvsblobprodwus2135.vsblob.vsassets.io
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node /usr/local/bin/yarn install (dns block)
• b15vsblobprodwus2164.vsblob.vsassets.io
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• d94vsblobprodwus2119.vsblob.vsassets.io
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• k4pvsblobprodwus2140.vsblob.vsassets.io
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• n6wvsblobprodwus2123.vsblob.vsassets.io
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• p2tvsblobprodwus2189.vsblob.vsassets.io
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• v41vsblobprodwus2175.vsblob.vsassets.io
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Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Bug] cmake.installPrefix is not passed to CMake when using presets</issue_title>
<issue_description>### Brief Issue Summary

cmake.installPrefix is not passed to CMake as CMAKE_INSTALL_PREFIX when using presets. Here is the minimal project setting for reproducing the problem.

CMakeLists.txt

cmake_minimum_required(VERSION 3.24)
project(my_project VERSION 0.1)

message("CMAKE_INSTALL_PREFIX: ${CMAKE_INSTALL_PREFIX}")

CMakePresets.json

{
  "version": 6,
  "cmakeMinimumRequired": {
    "major": 3,
    "minor": 25,
    "patch": 0
  },
  "configurePresets": [
    {
      "name": "default"
    }
  ]
}

.vscode/setting.json

{
    "cmake.installPrefix": "/some_path",
    "cmake.loggingLevel": "debug"
}

I expect message("CMAKE_INSTALL_PREFIX: ${CMAKE_INSTALL_PREFIX}") this line shows /some_path, but it show the system(cmake)'s default value (/usr/local in my case).

CMake Tools Diagnostics

{
  "os": "linux",
  "vscodeVersion": "1.98.2",
  "cmtVersion": "1.19.52",
  "configurations": [
    {
      "folder": "~/test_cmake_installdir",
      "cmakeVersion": "3.26.4",
      "configured": true,
      "generator": "Unix Makefiles",
      "usesPresets": true,
      "compilers": {
        "C": "~/anaconda3/bin/x86_64-conda-linux-gnu-cc",
        "CXX": "~/anaconda3/bin/x86_64-conda-linux-gnu-c++"
      }
    }
  ],
  "cpptoolsIntegration": {
    "isReady": true,
    "hasCodeModel": false,
    "activeBuildType": "",
    "buildTypesSeen": [
      ""
    ],
    "requests": [],
    "responses": [],
    "partialMatches": [],
    "targetCount": 0,
    "executablesCount": 0,
    "librariesCount": 0,
    "targets": []
  },
  "settings": [
    {
      "communicationMode": "automatic",
      "useCMakePresets": "auto",
      "configureOnOpen": true
    }
  ]
}

Debug Log

[main] Configuring project: test_cmake_installdir 
[main] Saving open files before configure/build
[driver] Start configure 
[driver] Running pre-configure checks and steps
[cmakefileapi-driver] Configuring using preset
[cmakefileapi-driver] Invoking CMake ~/anaconda3/bin/cmake with arguments ["-S~/test_cmake_installdir","-B~/test_cmake_installdir/out/build/default"]
[proc] Executing command: ~/anaconda3/bin/cmake -S~/test_cmake_installdir -B~/test_cmake_installdir/out/build/default
[proc]   with environment: {"CONDA_SHLVL":"1","DWP":"~/anaconda3/bin/x86_64-conda-linux-gnu-dwp","CONDA_EXE":"~/anaconda3/bin/conda","SSH_CONNECTION":"114.43.134.107 12819 140.112.101.71 22","host_alias":"x86_64-conda-linux-gnu","GPROF":"~/anaconda3/bin/x86_64-conda-linux-gnu-gprof","GXX":"~/anaconda3/bin/x86_64-conda-linux-gnu-g++","OLDPWD":"~/.vscode-server","LD_GOLD":"~/anaconda3/bin/x86_64-conda-linux-gnu-ld.gold","CMAKE_ARGS":"-DCMAKE_AR=~/anaconda3/bin/x86_64-conda-linux-gnu-ar -DCMAKE_CXX_COMPILER_AR=~/anaconda3/bin/x86_64-conda-linux-gnu-gcc-ar -DCMAKE_C_COMPILER_AR=~/anaconda3/bin/x86_64-conda-linux-gnu-gcc-ar -DCMAKE_RANLIB=~/anaconda3/bin/x86_64-conda-linux-gnu-ranlib -DCMAKE_CXX_COMPILER_RANLIB=~/anaconda3/bin/x86_64-conda-linux-gnu-gcc-ranlib -DCMAKE_C_COMPILER_RANLIB=~/anaconda3/bin/x86_64-conda-linux-gnu-gcc-ranlib -DCMAKE_LINKER=~/anaconda3/bin/x86_64-conda-linux-gnu-ld -DCMAKE_STRIP=~/anaconda3/bin/x86_64-conda-linux-gnu-strip -DCMAKE_BUILD_TYPE=Release","DEBUG_CPPFLAGS":"-D_DEBUG -D_FORTIFY_SOURCE=2 -Og -isystem ~/anaconda3/include","DEBUG_CFLAGS":"-march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-all -fno-plt -Og -g -Wall -Wextra -fvar-tracking-assignments -ffunction-sections -pipe -isystem ~/anaconda3/include","GCC_NM":"~/anaconda3/bin/x86_64-conda-linux-gnu-gcc-nm","GSETTINGS_SCHEMA_DIR_CONDA_BACKUP":"","CONDA_PREFIX":"~/anaconda3","GCC_RANLIB":"~/anaconda3/bin/x86_64-conda-linux-gnu-gcc-ranlib","CFLAGS":"-march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe -isystem ~/anaconda3/include","GCC_AR":"~/anaconda3/bin/x86_64-conda-linux-gnu-gcc-ar","FC_FOR_BUILD":"~/anaconda3/bin/x86_64-conda-linux-gnu-gfortran","SSH_AUTH_SOCK":"/run/user/1227/vscode-ssh-auth-sock-208288784","CONDA_TOOLCHAIN_HOST":"x86_64-conda-linux-gnu","_CE_M":"","CC":"~/anaconda3/bin/x86_64-conda-linux-gnu-cc","READELF":"~/anaconda3/bin/x86_64-conda-linux-gnu-readelf","XDG_SESSION_ID":"57","USER":"ivanac","CONDA_TOOLCHAIN_BUILD":"x86_64-conda-linux-gnu","CXXFLAGS":"-fvisibility-inlines-hidden -fmessage-length=0 -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe -isystem ~/anaconda3/include","STRIP":"~/anaconda3/bin/x86_64-conda-linux-gnu-strip","DEBUG_FFLAGS":"-march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe -isystem ~/anaconda3/include -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-all -fno-plt -Og -g...

</details>



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- Fixes microsoft/vscode-cmake-tools#4358

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