[PATCH v2] builddeb: generate multi-arch friendly linux-libc-dev package

[Cedric Hombourger]

Debian-based distributions place libc header files in a machine
specific directory (/usr/include/<libc-machine>) instead of
/usr/include/asm to support installation of the linux-libc-dev
package from multiple architectures. Move headers installed by
"make headers_install" accordingly using Debian's tuple from
dpkg-architecture.

Signed-off-by: Cedric Hombourger <Cedric_Hombourger@xxxxxxxxxx>
Reviewed-by: Henning Schild <henning.schild@xxxxxxxxxxx>
Reviewed-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 scripts/package/builddeb | 8 ++++++++
 scripts/package/mkdebian | 4 ++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/scripts/package/builddeb b/scripts/package/builddeb
index b03dd56a4782..15a034e18c37 100755
--- a/scripts/package/builddeb
+++ b/scripts/package/builddeb
@@ -132,6 +132,14 @@ fi
 if [ "$ARCH" != "um" ]; then
 	$MAKE -f $srctree/Makefile headers_check
 	$MAKE -f $srctree/Makefile headers_install INSTALL_HDR_PATH="$libc_headers_dir/usr"
+	if [ -n "$debarch" ]; then
+		# move asm headers to /usr/include/<libc-machine>/asm to match the structure
+		# used by Debian-based distros (to support multi-arch) but only if ARCH was
+		# translated to Debian's (debarch) - this is done by mkdebian
+		host_arch=$(dpkg-architecture -a$debarch -qDEB_HOST_MULTIARCH)
+		mkdir $libc_headers_dir/usr/include/$host_arch
+		mv $libc_headers_dir/usr/include/asm $libc_headers_dir/usr/include/$host_arch/
+	fi
 fi
 
 # Install the maintainer scripts
diff --git a/scripts/package/mkdebian b/scripts/package/mkdebian
index 8351584cb24e..8ebcb7d67fd2 100755
--- a/scripts/package/mkdebian
+++ b/scripts/package/mkdebian
@@ -212,11 +212,11 @@ cat <<EOF > debian/rules
 srctree ?= .
 
 build:
-	\$(MAKE) KERNELRELEASE=${version} ARCH=${ARCH} \
+	\$(MAKE) KERNELRELEASE=${version} ARCH=${ARCH} debarch=${debarch} \
 	KBUILD_BUILD_VERSION=${revision} -f \$(srctree)/Makefile
 
 binary-arch:
-	\$(MAKE) KERNELRELEASE=${version} ARCH=${ARCH} \
+	\$(MAKE) KERNELRELEASE=${version} ARCH=${ARCH} debarch=${debarch} \
 	KBUILD_BUILD_VERSION=${revision} -f \$(srctree)/Makefile intdeb-pkg
 
 clean:
-- 
2.11.0