d/rules: set job flag for make based on DEB_BUILD_OPTIONS

Copied from Debian's QEMU package's d/rules. Otherwise, ninja will end
up using only a single job (in Debian Bookworm/Proxmox VE 8).

Suggested-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

diff --git a/debian/rules b/debian/rules
index e69ba47d2df5b1002b0124dcc7641d0235a15923..dd757b11dd99087b56b27089e17d68e25915b426 100755 (executable)
--- a/debian/rules
+++ b/debian/rules
@@ -40,6 +40,9 @@ endif
 
 export CFLAGS
 
+# DEB_BUILD_OPTIONS=parallel=N
+MAKEFLAGS += $(subst parallel=,-j,$(filter parallel=%,${DEB_BUILD_OPTIONS}))
+
 ${BUILDDIR}/config.status: configure
        dh_testdir
        # Add here commands to configure the package.