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Makefile: add $(srctree) to dependency of compile_commands.json target

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When trying to build compile_commands.json for an external module against
the kernel built in a separate output directory, the following error is
displayed:

  make[1]: *** No rule to make target 'scripts/clang-tools/gen_compile_commands.py',
  needed by 'compile_commands.json'. Stop.

This is because gen_compile_commands.py was previously looked up using a
relative path to $(srctree), but commit b1992c3772 ("kbuild: use
$(src) instead of $(srctree)/$(src) for source directory") stopped
defining VPATH for external module builds.

Prefixing gen_compile_commands.py with $(srctree) fixes the problem.

Fixes: b1992c3772 ("kbuild: use $(src) instead of $(srctree)/$(src) for source directory")
Signed-off-by: Alexandre Courbot <gnurou@gmail.com>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Alexandre Courbot 2024-08-04 14:50:57 +09:00 committed by Masahiro Yamada
parent 8fcd8d1e63
commit 6fc9aacad4
1 changed files with 1 additions and 1 deletions
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Makefile
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@ -1980,7 +1980,7 @@ nsdeps: modules
quiet_cmd_gen_compile_commands = GEN $@
cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
$(extmod_prefix)compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \
$(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
$(if $(CONFIG_MODULES), $(MODORDER)) FORCE
$(call if_changed,gen_compile_commands)