[xen staging] build: add compile_commands.json target

[patchbot@xxxxxxx]

commit ad82632486e72a05dce928434739f663da005f62
Author:     George Dunlap <gwd@xxxxxxxxxxxxxx>
AuthorDate: Mon Aug 10 10:49:45 2026 +0100
Commit:     Anthony PERARD <anthony.perard@xxxxxxxxxx>
CommitDate: Tue Aug 11 11:07:16 2026 +0200

    build: add compile_commands.json target
    
    Add a convenience target generating the compilation database 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.  For an in-tree build,
    clangd and other consumers discover it there automatically when
    opening files; for an out-of-tree build, symlink it into the source
    tree root (consumers search the ancestors of the file being edited).
    
    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 <gwd@xxxxxxxxxxxxxx>
    Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 .gitignore   | 1 +
 xen/Makefile | 3 +++
 2 files changed, 4 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..d10c29162f 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -685,6 +685,9 @@ cloc:
            done; \
        done | cloc --list-file=-
 
+compile_commands.json: FORCE
+       $(PYTHON) $(srctree)/scripts/gen_compile_commands.py -d $(objtree)
+
 # Target used by xen-analysis.sh script to retrieve Xen build system variables
 export-variable-%:
        $(info $*=$($*))
--
generated by git-patchbot for /home/xen/git/xen.git#staging