[Pkg-utopia-maintainers] Bug#946303: dbus-glib: Please make autopkgtests cross-test-friendly

[Steve Langasek]

Package: dbus-glib
Version: 0.110-4
Severity: minor
Tags: patch
User: ubuntu-devel at lists.ubuntu.com
Usertags: origin-ubuntu focal ubuntu-patch

Dear maintainers,

In Ubuntu, we are in the process of moving the i386 architecture to a
compatibility-only layer on amd64, and therefore we are also moving our
autopkgtest infrastructure to test i386 binaries in a cross-environment.

This requires changes to some tests so that they are cross-aware and can do
the right thing.

The dbus-glib tests currently fail in this environment, because they are
build tests that do not invoke the toolchain in a cross-aware manner.  I've
verified that the attached patch lets the tests successfully build (and run)
i386 tests on an amd64 host.

Note that upstream autopkgtest doesn't currently set DEB_HOST_ARCH so this
is a complete no-op in Debian for the moment.  Support for cross-testing in
autopkgtest is currently awaiting review at
https://salsa.debian.org/ci-team/autopkgtest/merge_requests/69 and once
landed, will still have no effect unless autopkgtest is invoked with a '-a'
option.  So this change should be safe to land in your package despite this
not being upstream in autopkgtest.

Thanks for considering,
-- 
Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
Ubuntu Developer                                   https://www.debian.org/
slangasek at ubuntu.com                                     vorlon at debian.org
-------------- next part --------------
diff -Nru dbus-glib-0.110/debian/tests/build dbus-glib-0.110/debian/tests/build
--- dbus-glib-0.110/debian/tests/build	2019-01-29 01:44:28.000000000 -0800
+++ dbus-glib-0.110/debian/tests/build	2019-12-06 11:47:56.000000000 -0800
@@ -12,6 +12,10 @@
 
 cd "$AUTOPKGTEST_TMP"
 
+if [ -n "$DEB_HOST_GNU_TYPE" ]; then
+    CROSS_COMPILE="$DEB_HOST_GNU_TYPE-"
+fi
+
 echo "1..2"
 
 cat > connect.c <<'EOF'
@@ -42,7 +46,7 @@
 
 # Deliberately word-splitting, that's how pkg-config works:
 # shellcheck disable=SC2046
-gcc -o connect connect.c $(pkg-config --cflags --libs dbus-glib-1)
+${CROSS_COMPILE}gcc -o connect connect.c $(${CROSS_COMPILE}pkg-config --cflags --libs dbus-glib-1)
 test -x connect
 dbus-run-session -- ./connect
 echo "ok 1"