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Add handling of MSVC /external:var option and EXTERNAL_INCLUDE env variable. #14205
Description
It look like /external:var and EXTERNAL_INCLUDE are not handled. These should influence IntelliSense configurations by potentially adding include paths. (Identifying include path not previously specified, as external, will implicitly specify them as include paths.)
Some behavior clarification is here, in the context of aligning clang-cl behavior with MSVC: llvm/llvm-project#105738
Related: #14186
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Subham-KRLX commentedon Feb 23, 2026
Colen Garoutte-Carson (@Colengms) i would like to fix this issue can you please assign this to me.
Subham-KRLX commentedon Feb 23, 2026
I have submitted PR #14208 to address this. It implements robust parsing for the specialized MSVC/clang-cl flags and automatically resolves the EXTERNAL_INCLUDE environment variable ensuring these paths are correctly injected into the IntelliSense configuration.
Colengms commentedon Feb 23, 2026
Hi Subham (@Subham-KRLX) . This is something we need to implement in our native component, where we currently support
/external:Iand theINCLUDEenv variable, in common code shared with other projects. I don't think we can take a fix for this in the OpenSource TypeScript component.Subham-KRLX commentedon Feb 24, 2026
Colen Garoutte-Carson (@Colengms) I understand that this needs to be handled in the native component alongside the existing /external:I and INCLUDE support. I will close my PR. Appreciate the context.
huangqinjin commentedon Feb 28, 2026
Colen Garoutte-Carson (@Colengms)
EXTERNAL_INCLUDEshould influence IntelliSense, but looks like it is not possible to setEXTERNAL_INCLUDEbyconfigurationProvider.As
vscode-cmake-toolscan setup custom environment variables byenvironmentSetupScript, I am trying to provideEXTERNAL_INCLUDEto IntelliSense throughcompilerArgswith/external:Iin microsoft/vscode-cmake-tools#4718.Can we handle
/external:Ias system includes or provide a way to setEXTERNAL_INCLUDEbyconfigurationProvider?