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qemu: stop reconfiguring, and so rebuilding, QEMU on every build #343

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qemu: stop reconfiguring, and so rebuilding, QEMU on every build #343

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qemu: stop reconfiguring, and so rebuilding, QEMU on every build
daniel-rossier Oct 2, 2026
87426b4
qemu: shorten the configure comments, and set them apart from the code
daniel-rossier Oct 3, 2026
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23 changes: 19 additions & 4 deletions build/meta-qemu/classes/qemu.bbclass
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Original file line number Diff line number Diff line change
Expand Up @@ -11,15 +11,30 @@ qemu_do_configure () {
# per IB_PLATFORM), but PRESERVE any other arch already built in a prior
# run — otherwise meson would drop it. So building arm-softmmu then
# aarch64-softmmu (or vice-versa) keeps both qemu-system-* binaries.
tlist="${QEMU_TARGET}"
#
# Fixed order, so the same targets always give the same configure line.

tlist=""
for t in arm-softmmu aarch64-softmmu; do
if [ "$t" != "${QEMU_TARGET}" ] && ls build/$t/qemu-system-* >/dev/null 2>&1; then
tlist="$tlist,$t"
if [ "$t" = "${QEMU_TARGET}" ] || ls build/$t/qemu-system-* >/dev/null 2>&1; then
tlist="${tlist:+$tlist,}$t"
fi
done

# QEMU's configure wipes build/, so re-running it means a full rebuild.
# Only run it when the options changed; meson/ninja handle the rest.

args="--target-list=$tlist ${QEMU_OPTS}"
stamp=build/.ib-configure-args

if [ -f $stamp ] && [ "$(cat $stamp)" = "$args" ]; then
echo "QEMU already configured (target-list=$tlist), skipping configure"
return
fi

echo "Configuring QEMU (target-list=$tlist)..."
./configure --target-list=$tlist ${QEMU_OPTS}
./configure $args
echo "$args" > $stamp

}

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