Since commit 5f73e7d0386d ("kbuild: refactor cross-compiling
linux-headers package"), the linux-headers Debian package fails to
build when $(CC) cannot build userspace applications, for example,
when using toolchains installed by the 0day bot.
The host programs in the linux-headers package should be rebuilt using
the disto's cross-compiler, ${DEB_HOST_GNU_TYPE}-gcc instead of $(CC).
Hence, the variable 'CC' must be expanded in this shell script instead
of in the top-level Makefile.
Commit f354fc88a72a ("kbuild: install-extmod-build: add missing
quotation marks for CC variable") was not a correct fix because
CC="ccache gcc" should be unrelated when rebuilding userspace tools.
Fixes: 5f73e7d0386d ("kbuild: refactor cross-compiling linux-headers package")
Reported-by: Jeff Johnson <jeff.johnson@xxxxxxxxxxxxxxxx>
Closes: https://lore.kernel.org/linux-kbuild/CAK7LNARb3xO3ptBWOMpwKcyf3=zkfhMey5H2KnB1dOmUwM79dA@xxxxxxxxxxxxxx/T/#t
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
---
Changes in v2:
- Fix the comment line because 'CC' needs expanding in this script
scripts/package/install-extmod-build | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/scripts/package/install-extmod-build b/scripts/package/install-extmod-build
index b724626ea0ca..2966473b4660 100755
--- a/scripts/package/install-extmod-build
+++ b/scripts/package/install-extmod-build
@@ -62,8 +62,8 @@ if [ "${CC}" != "${HOSTCC}" ]; then
#
# Clear VPATH and srcroot because the source files reside in the output
# directory.
- # shellcheck disable=SC2016 # $(MAKE), $(CC), and $(build) will be expanded by Make
- "${MAKE}" run-command KBUILD_RUN_COMMAND='+$(MAKE) HOSTCC="$(CC)" VPATH= srcroot=. $(build)='"${destdir}"/scripts
+ # shellcheck disable=SC2016 # $(MAKE) and $(build) will be expanded by Make
+ "${MAKE}" run-command KBUILD_RUN_COMMAND='+$(MAKE) HOSTCC='"${CC}"' VPATH= srcroot=. $(build)='"${destdir}"/scripts
rm -f "${destdir}/scripts/Kbuild"
fi
--
2.43.0
