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Among the files generated by meson is compile_commands.json. It is not used by bitbake during the build. However, if the devtool workspace is opened inside an IDE, that IDE can use compile_commands.json to configure linting and code completion. This is notably relied on by the new devtool ide-sdk command. The problem is that the IDE using compile_commands.json does not know the $PATH set-up by bitbake, so it won't find the compiler. This results in linting errors, like missing headers. We can fix this by expliciting the absolute compiler paths in meson.cross. The compile_commands.json specification expressly states: "All paths specified in the command or file fields must be either absolute or relative to this directory." Link: https://clang.llvm.org/docs/JSONCompilationDatabase.html An alternative way to implement this is to directly change CXX inside bitbake.conf to make all recipes use absolute compiler paths.Since this would affect all recipes, so I would like to have the maintainers' opinion on this. It could make sense to use absolute compiler paths for all toolchain binaries, we already do so for the sysroot TOOLCHAIN_OPTIONS. Discussions have been opened with meson/ninja maintainers to implement this at their level: - https://github.com/ninja-build/ninja/issues/2383 - https://github.com/mesonbuild/meson/issues/12834 These tools have even less information on the environment so it makes sense for Yocto to provide the absolute paths. (From OE-Core rev: b4e00248049c2627b05eafa9313a48cf253623fa) Signed-off-by: Enguerrand de Ribaucourt <enguerrand.de-ribaucourt@savoirfairelinux.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>