On Sat, Jan 16, 2021 at 5:15 AM <jjohnson@xxxxxxxxxxxxxx> wrote: > > On 2021-01-14 17:12, Masahiro Yamada wrote: > > On Fri, Jan 15, 2021 at 6:50 AM Jeff Johnson <jjohnson@xxxxxxxxxxxxxx> > > wrote: > >> > >> From: Mahesh Kumar Kalikot Veetil <mkalikot@xxxxxxxxxxxxxx> > >> > >> Modules with a large number of compilation units may be > >> exceeding AR and LD command argument list. Handle this gracefully by > >> writing the long argument list in a file. The command line options > >> read from file are inserted in place of the original @file option. > >> > >> The usage is well documented at > >> https://www.gnu.org/software/make/manual/html_node/File-Function.html > >> > >> Signed-off-by: Mahesh Kumar Kalikot Veetil <mkalikot@xxxxxxxxxxxxxx> > >> Signed-off-by: Jeff Johnson <jjohnson@xxxxxxxxxxxxxx> > >> --- > > > > > > > > > > First, is this a real problem? > > If so, which module is exceeding the command line limit? > > On 2021-01-14 17:12, Masahiro Yamada wrote: > > First, is this a real problem? > > If so, which module is exceeding the command line limit? > > Mahesh & I appreciate all of the feedback. > > The issue is seen in an Android environment with an out-of-tree > driver. The combination of long path names and a large number > of source files is leading to the issue. > > Since Mahesh & I are not Kbuild gurus, is there an alternative > solution to this issue? > > Jeff I see. The support for out-of-tree modules is not nice in this regard, but fixing it would need many changes. The long-term solution might be to upstream your driver, but it might not be possible. One cheesy workaround might be to point the module path via a symbolic link. Let's say your module is located in a very deep directory, /home/foo/long/long/.../path/to/your/module make M=/home/foo/long/long/.../path/to/your/module modules would fail due to the too long command line. First, create a symbolic link as follows: ln -s /home/foo/long/long/.../path/to/your/module mod_dir Then, pass the symbolic link to M= option. make M=mod_dir modules -- Best Regards Masahiro Yamada
