Re: [PATCH v2] kbuild: install-extmod-build: Properly fix CC expansion when ccache is used

[Nicolas Schier <nsc@kernel.org>]

On Tue, Nov 11, 2025 at 08:43:51AM +0200, Abel Vesa wrote:
> 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: 140332b6ed72 ("kbuild: fix linux-headers package build when $(CC) cannot link userspace")
> Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
> ---
> Changes in v2:
> - Moved the new double quotes inside of single ones, to be able
>   to drop the escape, like Nathan suggested.
> - Re-worded the commit message according to the above change.
> - Link to v1: https://lore.kernel.org/r/20251110-kbuild-install-extmod-build-fix-cc-expand-third-try-v1-1-5c0ddb1c67a8@linaro.org
> ---
>  scripts/package/install-extmod-build | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Just as a note: the fix is only required for build rpm packages.  For
the Debian package call of install-extmod-build
CC="${DEB_HOST_GNU_TYPE}-gcc" is used, no matter what was given to make
deb-pkg.

Reviewed-by: Nicolas Schier <nsc@kernel.org>