Hi Jens, (related to https://lkml.org/lkml/2019/11/15/1152) I received questions about single builds not working properly some times in the past. For example, the following is a post from Christoph to kbuild ML, and my reply to it. On Wed, May 29, 2019 at 10:12 AM Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> wrote: > > On Tue, May 28, 2019 at 9:12 PM Christoph Hellwig <hch@xxxxxx> wrote: > > > > A few kernel modules have source files in multiple subdirectories. > > Trying to build just a single object of a source file in such a > > subdirectory currently doesn't work. > > > > For example: > > > > hch@brick:~/work/xfs$ make fs/xfs/libxfs/xfs_alloc.o > > CALL scripts/checksyscalls.sh > > CALL scripts/atomic/check-atomics.sh > > DESCEND objtool > > scripts/Makefile.build:42: fs/xfs/libxfs/Makefile: No such file or directory > > make[1]: *** No rule to make target 'fs/xfs/libxfs/Makefile'. Stop. > > make: *** [Makefile:1747: fs/xfs/libxfs/xfs_alloc.o] Error 2 > > > > Is there any reasonably easy way to get this to work? > > > While single targets are useful, > they never work correctly. > subdir-ccflags-y from upper Makefiles > are not inherited. > > I want to implement single targets correctly, but > I have never got around to it. > > "make fs/xfs/" is an alternative solution > although it will compile much more than you want. > > Another solution is to put a dummy > fs/xfs/libxfs/Makefile > > -- > Best Regards > Masahiro Yamada -- Best Regards Masahiro Yamada
