[PATCH v3 1/1] builddeb: generate multi-arch friendly linux-libc-dev package

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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>
---
 scripts/package/builddeb | 8 ++++++++
 scripts/package/mkdebian | 5 +++--
 2 files changed, 11 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..2d670ae2cabc 100755
--- a/scripts/package/mkdebian
+++ b/scripts/package/mkdebian
@@ -197,6 +197,7 @@ Architecture: $debarch
 Description: Linux support headers for userspace development
  This package provides userspaces headers from the Linux kernel.  These headers
  are used by the installed headers for GNU glibc and other system libraries.
+Multi-Arch: same
 
 Package: $dbg_packagename
 Section: debug
@@ -212,11 +213,11 @@ 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




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