[Scons-users] Has anyone seen anything like this

[Olivier, Jeffrey V]

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
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