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Message-ID: <20240804055057.262682-1-gnurou@gmail.com>
Date: Sun,  4 Aug 2024 14:50:57 +0900
From: Alexandre Courbot <gnurou@...il.com>
To: Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>
Cc: linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Alexandre Courbot <gnurou@...il.com>
Subject: [PATCH v2] Makefile: add $(srctree) to dependency of compile_commands.json target

When trying to build the compile_commands.json target from an external
module's 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 b1992c3772e6 ("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: b1992c3772e6 ("kbuild: use $(src) instead of $(srctree)/$(src) for source directory")
Signed-off-by: Alexandre Courbot <gnurou@...il.com>
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 8ad55d6e7b60..52d7dfe4212a 100644
--- a/Makefile
+++ b/Makefile
@@ -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)
-- 
2.46.0


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