[Scons-users] Scons Implicity Dependency not found issue

[Bill Deegan]

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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