On Tue, Jan 30, 2024 at 3:32 PM David F. <df7729@xxxxxxxxx> wrote: > > Hello, > > resending this because it doesn't show that it made it to the archives. > > I've been building an out-of-tree linux kernel module that has a .cpp > module (plus a library that is built) for well over a decade using the > basic method outlined at https://github.com/veltzer/kcpp. There was > a patch needed (provided here) in the 5.x version to be able to link > to the .a file generated. That patch I've been able to modify as > slight changes occured, but now in 6.6.14 things have changed a lot, > I'm not sure if I'll need something like it to get to the final link > but I don't think I'm at that point yet. > > My main issue now is this: > > LD [M] /media/sf_SRC_DRIVE/mymodule/l > inux/driver/6.6.14-686-mine/mymodule.o > ld -m elf_i386 -z noexecstack -r -o > /media/sf_SRC_DRIVE/mymodule/linux/driver/6.6.14-686-mine/mymodule.o > @/media/sf_SRC_DRIVE/mymodule/linux/driver/6.6.14-686-mine/mymodule.mod > # cmd_modules_order > /media/sf_SRC_DRIVE/mymodule/linux/driver/6.6.14-686-mine/modules.order > { echo /media/sf_SRC_DRIVE/mymodule/linux/driver/6.6.14-686-mine/mymodule.o; > :; } > /media/sf_SRC_DRIVE/mymodule/linux/driver/6.6.14-686-mine/modules.order > sh ./scripts/modules-check.sh > /media/sf_SRC_DRIVE/mymodule/linux/driver/6.6.14-686-mine/modules.order > make -f ./scripts/Makefile.modpost > # MODPOST /media/sf_SRC_DRIVE/mymodule/linux/driver/6.6.14-686-mine/Module.symvers > scripts/mod/modpost -M -m -o > /media/sf_SRC_DRIVE/mymodule/linux/driver/6.6.14-686-mine/Module.symvers > -T /media/sf_SRC_DRIVE/mymodule/linux/driver/6.6.14-686-mine/modules.order > -i Module.symvers -e > /media/sf_SRC_DRIVE/mymodule/linux/driver/6.6.14-686-mine/.mymodulelindrivercpp.o.cmd: > No such file or directory > > It has never built a *.o.cmd file for the .cpp module and still > doesn't, but the new system is looking for it. Could someone > familiar with kbuild tell me what I can patch / do to allow the system > to complete the build like it used to? > > Thank You. > Presumably, the relevant commit is f292d875d0dc700b3af0bef04c5abc1dc7b3b62c modpost requires .*.cmd files, when CONFIG_MODVERSIONS=y. This project does not produce .*.cmd file when building *.o from *.cc https://github.com/veltzer/kcpp/blob/177ea052f3c52c9f85bb091235061a0e620f51bd/Makefile#L68 -- Best Regards Masahiro Yamada
