linux-kernel - [PATCH] kbuild: install-extmod-build: Properly fix CC expansion when ccache is used

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20251110-kbuild-install-extmod-build-fix-cc-expand-third-try-v1-1-5c0ddb1c67a8@linaro.org>
Date: Mon, 10 Nov 2025 00:26:31 +0200
From: Abel Vesa <abel.vesa@...aro.org>
To: Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nsc@...nel.org>, 
 Masahiro Yamada <masahiroy@...nel.org>
Cc: Jeff Johnson <jeff.johnson@....qualcomm.com>, 
 linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Abel Vesa <abel.vesa@...aro.org>
Subject: [PATCH] kbuild: install-extmod-build: Properly fix CC expansion
 when ccache is used

Currently, when cross-compiling and ccache is used, the expanding of CC
turns out to be without any quotes, leading to the following error:

make[4]: *** No rule to make target 'aarch64-linux-gnu-gcc'.  Stop.
make[3]: *** [Makefile:2164: run-command] Error 2

And it makes sense, because after expansion it ends up like this:

make run-command KBUILD_RUN_COMMAND=+$(MAKE) \
HOSTCC=ccache aarch64-linux-gnu-gcc VPATH= srcroot=. $(build)= ...

So add another set of double quotes, this time escaped, to make sure the
aarch64-linux-gnu-gcc isn't expanded to something that looks like an
entirely separate target.

Fixes: 140332b6ed72 ("kbuild: fix linux-headers package build when $(CC) cannot link userspace")
Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
---
 scripts/package/install-extmod-build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/package/install-extmod-build b/scripts/package/install-extmod-build
index 054fdf45cc37a8717444b8094daf3e1150a8ccf5..6cce5c41552d520bf069487352fd26417b0b3899 100755
--- a/scripts/package/install-extmod-build
+++ b/scripts/package/install-extmod-build
@@ -63,7 +63,7 @@ if [ "${CC}" != "${HOSTCC}" ]; then
 	# Clear VPATH and srcroot because the source files reside in the output
 	# directory.
 	# shellcheck disable=SC2016 # $(MAKE) and $(build) will be expanded by Make
-	"${MAKE}" run-command KBUILD_RUN_COMMAND='+$(MAKE) HOSTCC='"${CC}"' VPATH= srcroot=. $(build)='"$(realpath --relative-to=. "${destdir}")"/scripts
+	"${MAKE}" run-command KBUILD_RUN_COMMAND='+$(MAKE) HOSTCC='\""${CC}"\"' VPATH= srcroot=. $(build)='"$(realpath --relative-to=. "${destdir}")"/scripts
 
 	rm -f "${destdir}/scripts/Kbuild"
 fi

---
base-commit: 9c0826a5d9aa4d52206dd89976858457a2a8a7ed
change-id: 20251109-kbuild-install-extmod-build-fix-cc-expand-third-try-2cb1540cadbf

Best regards,
-- 
Abel Vesa <abel.vesa@...aro.org>