Hi, I'm wondering what's the objective of the Mac devkit and how much is it being kept up to date.
I've been finding it useful to create a devkit that works for me to build the jdk inside a Nix shell on a mac. Nix shells easily allow me to capture all the dependencies building jdks have (e.g. capstone) in a reproducable way independent of global installations at the mac level. With the latest XCode 26 and Metal separation, I've been finding that the current mac devkit is not fully suited for this changes. As you might have seen in [1], Metal is no longer part of XCode 26 and now needs to be installed separately. The location where Metal gets installed by default is not inside /Applications/XCode.app but a rather different place. On my system this is: ``` % xcrun --find metallib /var/run/com.apple.security.cryptexd/mnt/com.apple.MobileAsset.MetalToolchain-v17.2.54.0.mgWMUd/Metal.xctoolchain/usr/bin/metallib ``` To be able to carry on building the JDK on a Nix shell, I manually moved the Metal.xctoolchain folder to /Applications/Xcode.app/Contents/Developer/Toolchains and then invoked the mac devkit script. This alone however was not enough to get the jdk to build, but the XCode 26 itself does have the `metal` executable and the jdk was picking it up. So, on top of that manual move, I tweaked the `DEVKIT_TOOLCHAIN_PATH` so that the Metal binaries would resolve out of the Metal.xctoolchain/usr/bin folder: ``` echo-info "DEVKIT_TOOLCHAIN_PATH=\"\$DEVKIT_ROOT/Xcode/Contents/Developer/Toolchains/Metal.xctoolchain/usr/bin:\$DEVKIT_ROOT/Xcode/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin:\$DEVKIT_ROOT/Xcode/Contents/Developer/usr/bin\"" ``` After doing this I rebuilt the devkit and I was able to build the jdk once again inside a Nix shell on mac. Of course, the devkit could have been modified to avoid the need for the manual move and instead resolve the `/var/run/...` folder. But I do wonder how much this devkit really is kept up to date and what's the use case that ended up creating it. Thanks Galder [1] https://bugs.openjdk.org/browse/JDK-8372393 [2] https://medium.com/%40sergey-pekar/how-to-fix-annoying-xcode-26-not-building-swiftui-previews-error-cannot-execute-tool-metal-due-49564e20357c -- Galder Zamarreño Software Developer IBM Software [email protected] IBM
