Re: [kbuild-all] make[2]: *** No rule to make target 'tools/testing/nvdimm//config_check.o', needed by 'tools/testing/nvdimm//dax.o'.

[Dan Williams]

On Mon, Aug 15, 2016 at 6:26 PM, Fengguang Wu <fengguang.wu@xxxxxxxxx> wrote:
> On Mon, Aug 15, 2016 at 05:58:36PM -0700, Dan Williams wrote:
>>
>> On Mon, Aug 15, 2016 at 3:03 AM, kbuild test robot
>> <fengguang.wu@xxxxxxxxx> wrote:
>>>
>>> tree:
>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>>> head:   694d0d0bb2030d2e36df73e2d23d5770511dbc8d
>>> commit: ab68f26221366f92611650e8470e6a926801c7d4 /dev/dax, pmem: direct
>>> access to persistent memory
>>> date:   3 months ago
>>> config: i386-randconfig-i1-201633 (attached as .config)
>>> compiler: gcc-4.8 (Debian 4.8.4-1) 4.8.4
>>> reproduce:
>>>         git checkout ab68f26221366f92611650e8470e6a926801c7d4
>>>         # save the attached .config to linux build tree
>>>         make ARCH=i386
>>>
>>> All errors (new ones prefixed by >>):
>>>
>>>>> make[2]: *** No rule to make target
>>>>> 'tools/testing/nvdimm//config_check.o', needed by
>>>>> 'tools/testing/nvdimm//dax.o'.
>>>
>>>    make[2]: Target '__build' not remade because of errors.
>>
>>
>> I think this is an invalid build test.  tools/testing/nvdimm/ uses a
>> external module Kbuild environment, not Kconfig.  So, there's nothing
>> I can do to prevent this compile error, unless there's some other way
>> 0-day could determine the configuration dependencies?
>
>
> Yeah if you can offer a concrete rule for the dependency, we'll add
> it to 0-day.

Sounds good.  The config_check.c file itself lists the dependencies:

void check(void)
{
        /*
         * These kconfig symbols must be set to "m" for nfit_test to
         * load and operate.
         */
        BUILD_BUG_ON(!IS_MODULE(CONFIG_LIBNVDIMM));
        BUILD_BUG_ON(!IS_MODULE(CONFIG_BLK_DEV_PMEM));
        BUILD_BUG_ON(!IS_MODULE(CONFIG_ND_BTT));
        BUILD_BUG_ON(!IS_MODULE(CONFIG_ND_PFN));
        BUILD_BUG_ON(!IS_MODULE(CONFIG_ND_BLK));
        BUILD_BUG_ON(!IS_MODULE(CONFIG_ACPI_NFIT));
        BUILD_BUG_ON(!IS_MODULE(CONFIG_DEV_DAX));
        BUILD_BUG_ON(!IS_MODULE(CONFIG_DEV_DAX_PMEM));
}