[ Upstream commit4ab2ee3079] 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 to surround whatever CC expands to to make sure the aarch64-linux-gnu-gcc isn't expanded to something that looks like an entirely separate target. Fixes:140332b6ed("kbuild: fix linux-headers package build when $(CC) cannot link userspace") Signed-off-by: Abel Vesa <abel.vesa@linaro.org> Reviewed-by: Nicolas Schier <nsc@kernel.org> Link: https://patch.msgid.link/20251111-kbuild-install-extmod-build-fix-cc-expand-third-try-v2-1-15ba1b37e71a@linaro.org Signed-off-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>