Re: build failure under pkgsrc

[Greg Troxel]

I cleaned and rebuilt; the --debug=explain,prepare is now in the build
recipe.

(I suspect this is a latent problem exposed by pkgsrc and thus it will be
good to fix it for everyone.  But as always we'll see when we find it.)

The invocation of scons has a ton of env vars to set things up, but the
basic invocation is:

  /usr/pkg/bin/scons  prefix=/usr/pkg mandir=/usr/pkg/man  leapfetch=no 
python_shebang=/usr/pkg/bin/python3.8 target_python=/usr/pkg/bin/python3.8 
manbuild=yes docdir=share/doc/gpsd --debug=explain,prepare  -j1

and then all seems normal and finally:

  scons: building `gpsd-3.23~rc1/www/troubleshooting.html' because it doesn't 
exist
  Preparing target gpsd-3.23~rc1/www/troubleshooting.html...
  Creating 'gpsd-3.23~rc1/www/troubleshooting.html'
  chmod -w gpsd-3.23~rc1/www/troubleshooting.html
  scons: building `gpsd-3.23~rc1/www/NEWS' because it doesn't exist
  Preparing target gpsd-3.23~rc1/www/NEWS...
  cp gpsd-3.23~rc1/NEWS gpsd-3.23~rc1/www/NEWS
  scons: building `gpsd-3.23~rc1/www/TODO' because it doesn't exist
  Preparing target gpsd-3.23~rc1/www/TODO...
  cp gpsd-3.23~rc1/TODO gpsd-3.23~rc1/www/TODO
  scons: building `gpsd-3.23~rc1/www/gpsdebuginfo' because it doesn't exist
  Preparing target gpsd-3.23~rc1/www/gpsdebuginfo...
  cp gpsd-3.23~rc1/clients/gpsdebuginfo gpsd-3.23~rc1/www/gpsdebuginfo
  scons: building `gpsd-3.23~rc1/gps-3.23~rc1.egg-info' because it doesn't exist
  Preparing target gpsd-3.23~rc1/gps-3.23~rc1.egg-info...
  Creating 'gpsd-3.23~rc1/gps-3.23~rc1.egg-info'
  scons: Cannot explain why `/usr/pkg/include/gps.h' is being rebuilt: No 
previous build information found
  Preparing target /usr/pkg/include/gps.h...
  scons: *** [/usr/pkg/include/gps.h] /usr/pkg/include/gps.h: Permission denied
  scons: building terminated because of errors.
  Ensure your PYTHONPATH includes /usr/pkg/lib/python3.8/site-packages/
  *** Error code 2

What I don't understand is why scons is trying to do what is an
installation step during the build step, and I can't find any reference
in SConscript.

Tracing the system calls of scons, it seems to be trying to unlink the
installed header:

   21199      1 python3.8 CALL  write(1,0x7025c9131800,0x69)
   21199      1 python3.8 GIO   fd 1 wrote 105 bytes
         "scons: Cannot explain why `/usr/pkg/include/gps.h' is being rebuilt: 
No previous build information found\n"
   21199      1 python3.8 RET   write 105/0x69
   21199      1 python3.8 CALL  write(1,0x7025c9131800,0x2a)
   21199      1 python3.8 GIO   fd 1 wrote 42 bytes
         "Preparing target /usr/pkg/include/gps.h..."
   21199      1 python3.8 RET   write 42/0x2a
   21199      1 python3.8 CALL  write(1,0x7025c9131800,1)
   21199      1 python3.8 GIO   fd 1 wrote 1 bytes
         "\n"
   21199      1 python3.8 RET   write 1
   21199      1 python3.8 CALL  unlink(0x7025c409b860)
   21199      1 python3.8 NAMI  "/usr/pkg/include/gps.h"
   21199      1 python3.8 RET   unlink -1 errno 13 Permission denied


When I build gpsd without pkgsrc, I haven't been passing prefix=/usr/pkg
(because I don't intend to install from that build), but it's still
calling stat on /usr/pkg/include/gps.h

Probably next I'll bisect some.

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