[Scons-users] Fwd: Help with scons: warning: No dependency generated for file: stdlib.h

[Jason Fritz]

Hi Dirk,

On Tue, Apr 8, 2014 at 12:03 PM, Dirk Bächle <tshortik at gmx.de> wrote:


>

> On 08.04.2014 19:42, Jason Fritz wrote:

>

>> Hi all,

>>

>> It seems the problem is related to turning on all warnings (specifically

>> the DependencyWarning class), but shouldn't that be a safe "best practice"?

>>

>>

> , you mean like everyone compiles his C/CPP files with "-Wall -Wextra

> -Werror" by default? ;)

>


What, doesn't everybody do that?? :)

Seriously, though, to my newbie mind, it seemed like a good/safe thing to
do to enable all warnings.  I would expect you wouldn't get any warnings in
normal situations like including system header files.  Maybe you should
enhance the DependencyWarning class to not report this warning for system
headers?  Otherwise the warning is basically meaningless, because any
"real" warnings about missing header files (i.e. files you actually care
about) will get lost in the clutter.



> I can understand that you'd really like to get rid of warnings, because

> they're often the path to full-grown errors and clutter the output. But

> there is a good reason to simply ignore these warnings in your case.

> As you suggested, you could add the required include paths for the system

> headers to CPPPATH. Then the warnings would go away, but you'd have much

> larger update times because SCons now checks the system headers for changes

> too. Every time, even though they'll never change...well not *never*, but

> the chances for this are rather low.

>

> So, both of your solutions are fine, you just have to pick the best

> tradeoff "no warnings" vs. "update speed" for your case.

>


Thanks a lot for this explanation!  It's now clear to me that I should just
turn off this particular warning.  Yes, I don't care about SCons checking
the system headers for changes.

Best regards,
Jason
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