Masahiro Yamada ed79c34d3c kbuild: deb-pkg: support DEB_BUILD_OPTIONS=parallel=N in debian/rules ... 'make srcdeb-pkg' generates a source package, which you can build later by using dpkg-buildpackage. In older dpkg versions, 'dpkg-buildpackage --jobs=N' sets not only DEB_BUILD_OPTIONS but also MAKEFLAGS. Hence, passing -j or --jobs to dpkg-buildpackage was enough for kicking the parallel execution. The behavior was changed by commit 1d0ea9b2ba3f ("dpkg-buildpackage: Change -j, --jobs semantics to non-force mode") of dpkg project. [1] Since then, 'dpkg-buildpackage --jobs=N' sets only DEB_BUILD_OPTIONS, which is not parsed by the current debian/rules. To build the package in parallel, you need to pass the alternative --jobs-force option or set the MAKEFLAGS environment variable. Debian policy [2] suggests the following code snippet for debian/rules. ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS))) NUMJOBS = $(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS))) MAKEFLAGS += -j$(NUMJOBS) endif I tweaked the code to filter out parallel=1 and passed --jobs=1 to dpkg-buildpackage from scripts/Makefile.package. It is needed to force 'make deb-pkg' without the -j option to run in serial. Please note that dpkg-buildpackage sets parallel=<nproc> in DEB_BUILD_OPTIONS by default (that is, --jobs=auto is the default) and --jobs=1 is needed to restore the serial execution. When dpkg-buildpackage is invoked from Kbuild, the number of jobs is inherited from the top level Makefile. Passing --jobs=1 to dpkg-buildpackage allows debian/rules to skip parsing DEB_BUILD_OPTIONS. [1] 1d0ea9b2ba [2] https://www.debian.org/doc/debian-policy/ch-source.html#s-debianrules-options Reported-by: Bastian Germann <bage@linutronix.de> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>		2023-08-29 22:29:35 +09:00
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rules	kbuild: deb-pkg: support DEB_BUILD_OPTIONS=parallel=N in debian/rules	2023-08-29 22:29:35 +09:00