[PATCH] buildchroot: Do not build cross when there are no

[Jan Kiszka <jan.kiszka@siemens.com>]

From: Jan Kiszka <jan.kiszka@siemens.com>

When all binary packages are "Architecture: all", we can avoid the cross
build and use the host architecture directly. This specifically resolves
cross-build issue with dependencies that are not cross-ready.

More concretely, if the build dependency meta package requests an arch-
independent package, this fails because apt seems to look only for
my-dependency:arch, ignoring that there is only :all.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---

I still find this strange that we have to add such an extra measure - 
which isn't even working if there is only one arch-specific binary 
package. This should rather be handled by mk-build-deps or actually apt 
itself.

 meta/recipes-devtools/buildchroot/files/deps.sh | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meta/recipes-devtools/buildchroot/files/deps.sh b/meta/recipes-devtools/buildchroot/files/deps.sh
index 19eb9b7..c04acce 100644
--- a/meta/recipes-devtools/buildchroot/files/deps.sh
+++ b/meta/recipes-devtools/buildchroot/files/deps.sh
@@ -25,6 +25,12 @@ apt-get update \
     -o Dir::Etc::sourceparts="-" \
     -o APT::Get::List-Cleanup="0"
 
+# Do not set an architecture when building only 'all' (generic) packages.
+# This can avoid unneeded cross-build issues.
+if ! grep "^Architecture:" debian/control | grep -qv "all"; then
+	set_arch=""
+fi
+
 # Install all build deps
 mk-build-deps $set_arch -t "${install_cmd}" -i -r debian/control
 
-- 
2.16.4