[PATCH L-C v3 6/7] buildchroot-host: install qemu-static to support hybrid cross-compiles

[Cedric Hombourger <Cedric_Hombourger@mentor.com>]

The Linux kernel has great support for cross-compiling the kernel image
and modules. There is however no support/mechanism for cross-compiling the
build tools from its "scripts" directory. While HOSTCC may be set to use
our cross-compiler, the kernel build infrasture would then try to run
foreign-arch binaries such as fixdep. The easiest and least intrusive way
to support this is to enable execution of such binaries via binfmt/qemu
like we do in the buildchroot-target environment.

Signed-off-by: Cedric Hombourger <Cedric_Hombourger@mentor.com>
---
 meta/recipes-devtools/buildchroot/buildchroot-host.bb | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meta/recipes-devtools/buildchroot/buildchroot-host.bb b/meta/recipes-devtools/buildchroot/buildchroot-host.bb
index 408ad39..2e76acb 100644
--- a/meta/recipes-devtools/buildchroot/buildchroot-host.bb
+++ b/meta/recipes-devtools/buildchroot/buildchroot-host.bb
@@ -15,3 +15,9 @@ BUILDCHROOT_PREINSTALL ?= " \
     ${BUILDCHROOT_PREINSTALL_COMMON} \
     libc6:${DISTRO_ARCH} \
     crossbuild-essential-${DISTRO_ARCH}"
+
+buildchroot_install_files_append() {
+    if [ -e '/usr/bin/qemu-${QEMU_ARCH}-static' ]; then
+       sudo cp '/usr/bin/qemu-${QEMU_ARCH}-static' '${BUILDCHROOT_DIR}/usr/bin/qemu-${QEMU_ARCH}-static'
+    fi
+}
-- 
2.20.1