Re: [PATCH 3/3] build: add compile_commands.json target

On Wed, Aug 05, 2026 at 11:52:40AM +1000, George Dunlap wrote:
> Add a phony convenience target generating the compilation database

"phony convenience target", that a funny way to put it :-) the target
isn't phony, it just use the Make keyword "phony" to have it ignore the
existing target.

> from a built object tree, alongside the other developer conveniences
> (tags, cscope, cloc -- the last of which already walks the same .cmd
> files):
> 
>     make -C xen compile_commands.json
> 
> The output lands in the object tree root, where clangd and other
> consumers discover it automatically when opening files from an
> in-tree build.

What about out-of-tree build? :-) that first part of the sentence
almost seems to acknowledge their existence. Anyway, one can create a
symlink.

> Note the database records the compiler invocations actually used.
> With a clang build it is consumable by clangd as-is; for a gcc build,
> clang-based tools may need a small .clangd configuration
> (CompileFlags: Remove/Add) dropping gcc-only flags.
> 
> Also add the generated file to .gitignore.
> 
> Assisted-by: LLM
> Signed-off-by: George Dunlap <[email protected]>
> ---
>  .gitignore   | 1 +
>  xen/Makefile | 4 ++++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/.gitignore b/.gitignore
> index bfc7bdf043..0aa9b801de 100644
> --- a/.gitignore
> +++ b/.gitignore
> @@ -192,6 +192,7 @@ xen/arch/*/include/generated
>  xen/build-dir-cppcheck/
>  xen/common/config_data.S
>  xen/common/config.gz
> +xen/compile_commands.json
>  xen/cppcheck-htmlreport/
>  xen/cppcheck-report/
>  xen/cppcheck-misra.*
> diff --git a/xen/Makefile b/xen/Makefile
> index d39bdfdd53..f87240f33c 100644
> --- a/xen/Makefile
> +++ b/xen/Makefile
> @@ -685,6 +685,10 @@ cloc:
>  	    done; \
>  	done | cloc --list-file=-
>  
> +.PHONY: compile_commands.json
> +compile_commands.json:

Could you use FORCE instead .PHONY? That is just:

    +compile_commands.json: FORCE

Thanks,


-- 
Anthony Perard | Vates XCP-ng Developer

XCP-ng & Xen Orchestra - Vates solutions

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