linux-kernel - [PATCH] kbuild: fix 'make modules' error when CONFIG_DEBUG_INFO_BTF

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Message-Id: <20230110054800.119222-1-masahiroy@kernel.org>
Date:   Tue, 10 Jan 2023 14:48:00 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>
Subject: [PATCH] kbuild: fix 'make modules' error when CONFIG_DEBUG_INFO_BTF_MODULES=y

When CONFIG_DEBUG_INFO_BTF_MODULES=y, running 'make modules'
in the clean kernel tree will get the following error.

  $ grep CONFIG_DEBUG_INFO_BTF_MODULES .config
  CONFIG_DEBUG_INFO_BTF_MODULES=y
  $ make -s clean
  $ make modules
    [snip]
    AR      vmlinux.a
  ar: ./built-in.a: No such file or directory
  make: *** [Makefile:1241: vmlinux.a] Error 1

'modules' depends on 'vmlinux', but builtin objects are not built.

Define KBUILD_BUILTIN.

Fixes: f73edc8951b2 ("kbuild: unify two modpost invocations")
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index 760640162db6..2ee3ab599477 100644
--- a/Makefile
+++ b/Makefile
@@ -1525,6 +1525,7 @@ endif
 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES
 # is an exception.
 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
+KBUILD_BUILTIN := 1
 modules: vmlinux
 endif
 
-- 
2.34.1