140332b6ed
Since commit5f73e7d038("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 $(CC). Hence, the variable 'CC' must be expanded in this shell script instead of in the top-level Makefile. Commitf354fc88a7("kbuild: install-extmod-build: add missing quotation marks for CC variable") was not a correct fix because CC="ccache gcc" should be unrelated when rebuilding userspace tools. Fixes:5f73e7d038("kbuild: refactor cross-compiling linux-headers package") Reported-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com> Closes: https://lore.kernel.org/linux-kbuild/CAK7LNARb3xO3ptBWOMpwKcyf3=zkfhMey5H2KnB1dOmUwM79dA@mail.gmail.com/T/#t Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Tested-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
71 lines
2.1 KiB
Bash
Executable file
71 lines
2.1 KiB
Bash
Executable file
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0-only
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set -eu
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destdir=${1}
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is_enabled() {
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grep -q "^$1=y" include/config/auto.conf
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}
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find_in_scripts() {
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find scripts \
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\( -name atomic -o -name dtc -o -name kconfig -o -name package \) -prune -o \
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! -name unifdef -a ! -name mk_elfconfig -a \( -type f -o -type l \) -print
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}
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mkdir -p "${destdir}"
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(
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cd "${srctree}"
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echo Makefile
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find "arch/${SRCARCH}" -maxdepth 1 -name 'Makefile*'
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find "arch/${SRCARCH}" -name generated -prune -o -name include -type d -print
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find "arch/${SRCARCH}" -name Kbuild.platforms -o -name Platform
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find include \( -name config -o -name generated \) -prune -o \( -type f -o -type l \) -print
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find_in_scripts
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) | tar -c -f - -C "${srctree}" -T - | tar -xf - -C "${destdir}"
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{
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if is_enabled CONFIG_OBJTOOL; then
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echo tools/objtool/objtool
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fi
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echo Module.symvers
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echo "arch/${SRCARCH}/include/generated"
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echo include/config/auto.conf
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echo include/config/kernel.release
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echo include/generated
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find_in_scripts
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if is_enabled CONFIG_GCC_PLUGINS; then
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find scripts/gcc-plugins -name '*.so'
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fi
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} | tar -c -f - -T - | tar -xf - -C "${destdir}"
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# When ${CC} and ${HOSTCC} differ, rebuild host programs using ${CC}.
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#
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# This caters to host programs that participate in Kbuild. objtool and
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# resolve_btfids are out of scope.
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if [ "${CC}" != "${HOSTCC}" ]; then
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cat "${destdir}/scripts/Makefile" - <<-'EOF' > "${destdir}/scripts/Kbuild"
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subdir-y += basic
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hostprogs-always-y += mod/modpost
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mod/modpost-objs := $(addprefix mod/, modpost.o file2alias.o sumversion.o symsearch.o)
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EOF
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# HOSTCXX is not overridden. The C++ compiler is used to build:
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# - scripts/kconfig/qconf, which is unneeded for external module builds
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# - GCC plugins, which will not work on the installed system even after
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# being rebuilt.
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#
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# Clear VPATH and srcroot because the source files reside in the output
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# directory.
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# shellcheck disable=SC2016 # $(MAKE) and $(build) will be expanded by Make
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"${MAKE}" run-command KBUILD_RUN_COMMAND='+$(MAKE) HOSTCC='"${CC}"' VPATH= srcroot=. $(build)='"${destdir}"/scripts
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rm -f "${destdir}/scripts/Kbuild"
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fi
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find "${destdir}" \( -name '.*.cmd' -o -name '*.o' \) -delete
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