[Scons-users] Scons Implicity Dependency not found issue

[Hua Yanghao]

Config.h does not include any other headers. And the problem is it is not
easily reproducible. However once it happens it is sticky. I will try
harder tomorrow and get back to you. Thanks.

On Tue 16. Oct 2018 at 23:06, Bill Deegan <bill at baddogconsulting.com> wrote:

> Try running with
>
> --taskmastertrace=trace.log
>
> You'll get a pretty verbose log there, and search for io.h it should show
> more information about what's happening.
>
> Is io.h included via "-include config.h" ?
>
> -Bill
>
> On Tue, Oct 16, 2018 at 5:01 PM Hua Yanghao <huayanghao at gmail.com> wrote:
>
>> Hi Bill,
>> Sorry I missed that one.
>>
>> The full command line when hit the failure:
>> gcc -o build/configs/pangu/usw/firmware/arch/pangu/test.os -c -g -Wall
>> -Werror -include config.h -Wno-error=main -Wno-main -Wno-format-security
>> -Wno-format -std=gnu99 -D_USW_FLAGS_TEST_0 -D_USW_FLAGS_TEST_1
>> -D_USW_FLAGS_TEST_2 -fPIC -Ibuild/configs/pangu/usw/config
>> -Ibuild/configs/pangu/usw/firmware/arch/pangu/include
>> -Ibuild/configs/pangu/usw/firmware/include
>> -Ibuild/configs/pangu/usw/firmware/arch/include
>> -Ibuild/configs/pangu/usw/firmware/common/include
>> -Ibuild/configs/pangu/usw/firmware/lib/cmd/include
>> -Ibuild/configs/pangu/usw/firmware/lib/simple_pipe/include
>> -Ibuild/configs/pangu/usw/firmware/lib/fio/include
>> -Ibuild/configs/pangu/usw/firmware/lib/simple_console/include
>> -Ibuild/configs/pangu/usw/firmware/test/example/include
>> -Ibuild/configs/pangu/usw/firmware/test/console/include
>> -Ibuild/configs/pangu/usw/firmware/boards/include
>> -Ibuild/configs/pangu/usw/firmware/boards/pangu/include
>> -Ibuild/configs/pangu/usw/firmware/drivers/pcie/include
>> -Ibuild/configs/pangu/usw/config
>> -Ibuild/configs/pangu/usw/firmware/arch/pangu/include
>> -Ibuild/configs/pangu/usw/firmware/include
>> -Ibuild/configs/pangu/usw/firmware/arch/include
>> -Ibuild/configs/pangu/usw/firmware/common/include
>> -Ibuild/configs/pangu/usw/firmware/lib/cmd/include
>> -Ibuild/configs/pangu/usw/firmware/lib/simple_pipe/include
>> -Ibuild/configs/pangu/usw/firmware/lib/fio/include
>> -Ibuild/configs/pangu/usw/firmware/lib/simple_console/include
>> -Ibuild/configs/pangu/usw/firmware/test/example/include
>> -Ibuild/configs/pangu/usw/firmware/test/console/include
>> -Ibuild/configs/pangu/usw/firmware/boards/include
>> -Ibuild/configs/pangu/usw/firmware/boards/pangu/include
>> -Ibuild/configs/pangu/usw/firmware/drivers/pcie/include
>> build/configs/pangu/usw/firmware/arch/pangu/test.c
>>
>> And my CPPPATH seems also matching the command line:
>> ['/home/hua/git/usw/build/configs/pangu/usw/config',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/arch/pangu/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/arch/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/common/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/lib/cmd/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/lib/simple_pipe/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/lib/fio/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/lib/simple_console/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/test/example/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/test/console/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/boards/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/boards/pangu/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/drivers/pcie/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/config',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/arch/pangu/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/arch/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/common/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/lib/cmd/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/lib/simple_pipe/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/lib/fio/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/lib/simple_console/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/test/example/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/test/console/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/boards/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/boards/pangu/include',
>> '/home/hua/git/usw/build/configs/pangu/usw/firmware/drivers/pcie/include']
>>
>> Note the firmware/include is in both command line and CPPPATH, that's
>> where my io.h is located.
>>
>> Best Regards,
>> Yanghao
>>
>>
>> On Tue, Oct 16, 2018 at 8:07 PM Bill Deegan <bill at baddogconsulting.com>
>> wrote:
>>
>>> You've still not replied with the compile command line.
>>> Also what's your CPPPATH?
>>>
>>>
>>> On Tue, Oct 16, 2018 at 1:25 PM Hua Yanghao <huayanghao at gmail.com>
>>> wrote:
>>>
>>>> it is the correct path and io.h is actually duplicated from
>>>> firmware/include/io.h
>>>>
>>>> On Tue 16. Oct 2018 at 17:34, Bill Deegan <bill at baddogconsulting.com>
>>>> wrote:
>>>>
>>>>> Is `build/configs/pangu/usw/firmware/arch/pangu/include/io.h' the
>>>>> correct path to io.h?
>>>>> Are you using duplicate=0, or not specifying in you SConscript()?
>>>>> Are you using chdir somewhere in your SCons logic?
>>>>>
>>>>> Also, please paste the compile line for the compile which should find
>>>>> io.h when it's passing?
>>>>>
>>>>> On Tue, Oct 16, 2018 at 11:14 AM Hua Yanghao <huayanghao at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> no it is static file.
>>>>>>
>>>>>> On Tue 16. Oct 2018 at 17:08, Bill Deegan <bill at baddogconsulting.com>
>>>>>> wrote:
>>>>>>
>>>>>>> Is io.h a generated file?
>>>>>>> Paste the compile line for the compile which should find io.h when
>>>>>>> it's passing?
>>>>>>>
>>>>>>>
>>>>>>> On Tue, Oct 16, 2018 at 8:54 AM Hua Yanghao <huayanghao at gmail.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Hi Bill,
>>>>>>>> Yes io.h is on my CPPPATH. And I am using variant_dir="build" for
>>>>>>>> SConscript files. So normally all used header files will end up in
>>>>>>>> the
>>>>>>>> build folder too. But occasionally scons seems missed it. I am
>>>>>>>> struggling to reproduce it ...
>>>>>>>>
>>>>>>>> BR, Yanghao
>>>>>>>> On Tue, Oct 16, 2018 at 2:51 PM Bill Deegan <
>>>>>>>> bill at baddogconsulting.com> wrote:
>>>>>>>> >
>>>>>>>> > Yes. Headers are scanned recursively.
>>>>>>>> > Implicit cache should only be enable by command line flag or
>>>>>>>> SetOption()
>>>>>>>> >
>>>>>>>> > Where is io.h located? is it in your CPPPATH?
>>>>>>>> >
>>>>>>>> > On Tue, Oct 16, 2018 at 6:43 AM Hua Yanghao <huayanghao at gmail.com>
>>>>>>>> wrote:
>>>>>>>> >>
>>>>>>>> >> By the way, is scons scanner scans C file headers recursively?
>>>>>>>> Thanks.
>>>>>>>> >> On Tue, Oct 16, 2018 at 12:40 PM Hua Yanghao <
>>>>>>>> huayanghao at gmail.com> wrote:
>>>>>>>> >> >
>>>>>>>> >> > scons: ***
>>>>>>>> [build/configs/pangu/usw/firmware/arch/pangu/test.os]
>>>>>>>> >> > Implicit dependency
>>>>>>>> >> > `build/configs/pangu/usw/firmware/arch/pangu/include/io.h' not
>>>>>>>> found,
>>>>>>>> >> > needed by target
>>>>>>>> `build/configs/pangu/usw/firmware/arch/pangu/test.os'
>>>>>>>> >> >
>>>>>>>> >> > I recently run into this odd problem, and it is very difficult
>>>>>>>> to
>>>>>>>> >> > reproduce. I did not explicitly enable the "implicit_cache"
>>>>>>>> option
>>>>>>>> >> > anywhere in my code. If I simply remove the build folder and
>>>>>>>> then
>>>>>>>> >> > re-build everything works as normal. the problem happens when
>>>>>>>> there is
>>>>>>>> >> > a old build, and then I pulled in some new code where this
>>>>>>>> "test.c"
>>>>>>>> >> > has included an additional header io.h and scons seems not
>>>>>>>> re-scanning
>>>>>>>> >> > the file by default.
>>>>>>>> >> >
>>>>>>>> >> > I am using scons 3.0.1, is the implict_cache by default
>>>>>>>> enabled there
>>>>>>>> >> > and I have to disable it manually?
>>>>>>>> >> >
>>>>>>>> >> > Thanks,
>>>>>>>> >> > Yanghao Hua
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