Eclipse on MAC OS X Does not detect LLVM toolchain

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In Xcode app menu > Toolchains > set the one you want to use.

And set the environment variable export TOOLCHAINS=org.llvm.12.0.1. See the following steps to find the correct value of the env var.

If you just downloaded the compiler, headers etc., and no xctoolchain, then do this:

  • Copy /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain to ~/Library/Developer/Toolchains/

  • Delete the contents of ~/Library/Developer/Toolchains/XcodeDefault.xctoolchain/usr.

  • Either copy the share, libexec, lib, include, bin folders from the LLVM binaries to these locations inside ~/Library/Developer/Toolchains/XcodeDefault.xctoolchain/usr. Or you can create symlinks.

  • Edit the ~/Library/Developer/Toolchains/XcodeDefault.xctoolchain/ToolchainInfo.plist to change the Identifier to whatever you want.

Simply downloading the binaries doesn’t make it a “toolchain” that Xcode expects like in /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain

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