Visual Studio Code: IntelliSense stopped finding core c++ includes in MacOS

Issue

This Content is from Stack Overflow. Question asked by trbabb

In OSX Monterey, after upgrading a Homebrew install of clang, something about the default C++ headers got screwed up.

I am able to compile from the terminal just fine; it works both if I use the system clang (/usr/bin/clang, which is still the default and the result of which clang), or if I use Homebrew’s more recent clang (/usr/local/Cellar/llvm/14.0.6_1/bin/clang).

However, in VSCode, none of the default C++ headers can be found.

For example, if I #include <iostream>, IntelliSense red-squiggles it and complains cannot open source file "iostream" C/C++(1696).

I have tried restarting VSCode and my machine, I’ve tried Reset IntelliSense Database from the command palette. To the C_Cpp > System Include Path setting, I’ve tried adding /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/; and to the C_Cpp > Mac Framework Path setting I’ve tried explicitly adding /System/Library/Frameworks/. None of these things have fixed the issue.

After upgrading, I also had some issues with clang not finding the system includes which were fixed by reinstalling the XCode developer tools.

  • How do I debug why IntelliSense can’t find the standard headers?
  • How do repair this problem?



Solution

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