[Scons-users] Has anyone seen anything like this

[Bill Deegan]

Did you try using --debug=explain first?
That's the builtin logic to help figure out they why's..
(though it's not perfect)

Is that header file generated? or just static in the filesystem?

On Tue, May 24, 2022 at 10:20 AM Olivier, Jeffrey V <
jeffrey.v.olivier at intel.com> wrote:

> I am building the DAOS project from github.com/daos-stack/daos and
> hitting the following issue
>
> And I've noticed that when I change a header file
> (src/include/daos_errno.h), dependent targets do not get rebuilt (e.g.
> src/gurt/errno.c).  The only thing that does get built is the Install
> builder for the file.  But the other targets which add src/include to the
> CPPPATH do not get built.  I've been trying to track down why it doesn't
> get rebuilt so I narrowed it down a bit by adding some of my own debug
> prints down in the SCons code.  I found that the csig for the Include case
> for the same file differs from the csig for the various cases of implicit
> dependencies returned by the scanner.
>
> To illustrate this, I've added these prints in SCons/Node/FS.py
>
> 3327     def changed_content(self, target, prev_ni, repo_node=None):
> 3328         cur_csig = self.get_csig()
> 3329         check = str(self) == 'src/include/daos_errno.h'
> 3330         if check:
> 3331             print("\nChecking %s" % str(self))
> 3332         try:
> 3333             if check:
> 3334                 print(" new_sig=%s old_sig=%s changed=%s" %
> (cur_csig, prev_ni.csig, str(cur_csig != prev_ni.csig)))
> 3335             return cur_csig != prev_ni.csig
> 3336         except AttributeError:
> 3337             return 1
>
> When I do this, I see this in the output for all of the checks for
> implicit dependencies:
>
> Checking src/include/daos_errno.h
>  new_sig=0ffda7577e533f682945b5d4c508cdd6
> old_sig=0ffda7577e533f682945b5d4c508cdd6 changed=False
>
> But the sequence surrounding the Install builder looks like this:
> Checking src/include/daos_errno.h
>  new_sig=b2b4b801f3f4ee78151223fa2b2d3e98
> old_sig=4baa3b48b7e1cc339227b11676299434 changed=True
> Checking src/include/daos_errno.h
>  new_sig=b2b4b801f3f4ee78151223fa2b2d3e98
> old_sig=4baa3b48b7e1cc339227b11676299434 changed=Tru
> Install file: "src/include/daos_errno.h" as "install/include/daos_errno.h"
>
> As you can see, the signature for the same file differs between these two
> cases.  Does anyone here know what might be happening here?
>
> A few other details:
>
>    - The DAOS build uses VariantDir with duplicate=0
>    - CPPPATH includes src/include
>
> I'm at a loss as to why this would happen and any help would be
> appreciated.  I've not been able to reproduce with a simpler build.
> Admittedly, the DAOS build is fairly complicated as we have some optional
> options to prebuild a bunch of external dependencies that may not be
> installed.
>
> -Jeff
>
>
>
>
> ______________________
> Jeff Olivier, DAOS engineer
> ASE/SCP/AXG/Intel
> +1 720-487-7145
> _______________________________________________
> Scons-users mailing list
> Scons-users at scons.org
> https://pairlist4.pair.net/mailman/listinfo/scons-users
>
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