[Plplot-devel] Showstopper linking bug; release on hold

[Alan W. I. <ir...@be...>]

Hi Rafael (with questions for Andrew):

I cannot confirm the make check error you found for tcl that you reported
privately to me.  If plplot is installed, then "make check" works without any
problems at all for me.  But it must be an up-to-date version of plplot that
is installed, and I think that must be the source of the make check tcl
troubles on your system.

Before you ask "why should the installed version matter?" this is a new
showstopper bug I just found for make check.  If you have absolutely nothing
related to plplot installed, it won't work.  (Try this for yourself.)
libplplotd.so.9 cannot be found for some (but here is the crazy thing) but
not all of the examples. The C examples are fine.  The C++ examples x01cc
x09 x15 x16 and x22 all fail while the remaining C++ examples are fine (!)
All fortran examples are fine, all the tcl examples fail because pltcl
cannot find libplplotd.so.9.

I concentrated on the C++ examples and in particular on x08 (which works)
and x09 which fails to find the libplplotd.so.9 library.  Setting
LD_LIBRARY_PATH to point to the correct build tree location
fixes the problem or installing plplot fixes the problem for x09, but why
should this be necessary when x08 works fine?  The relink commands are
the same if you look at the x08 and x09 scripts created by make check.

Andrew, can you figure this out?  What is different about the source code
for the working c++ examples compared to the non-working examples that causes
a library not-found problem?  BTW, after make check and execution of the
./x08 and ./x09 scripts try

ldd .libs/lt-x08
ldd .libs/lt-x09

which are created by the relink commands in the scripts.

Here is what I get:

ldd .libs/lt-x08
                 libplplotcxxd.so.9 => /home/software/plplot_cvs/HEAD/plplot_working/bindings/c++/.libs/libplplotcxxd.so.9 (0x40018000)
         libstdc++.so.5 => /usr/lib/libstdc++.so.5 (0x40034000)
         libm.so.6 => /lib/tls/libm.so.6 (0x400ed000)
         libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x40110000)
         libc.so.6 => /lib/tls/libc.so.6 (0x40118000)
         libplplotd.so.9 => /home/software/plplot_cvs/HEAD/plplot_working/src/.libs/libplplotd.so.9 (0x40253000)
         /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
         libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x40298000)
         libcsirocsa.so.0 => /home/software/plplot_cvs/HEAD/plplot_working/lib/csa/.libs/libcsirocsa.so.0 (0x40305000)
         libcsironn.so.0 => /home/software/plplot_cvs/HEAD/plplot_working/lib/nn/.libs/libcsironn.so.0 (0x4030c000)
         libdl.so.2 => /lib/tls/libdl.so.2 (0x40313000)
         libz.so.1 => /usr/lib/libz.so.1 (0x40316000)
         libqhull.so.5 => /usr/lib/libqhull.so.5 (0x40328000)


ldd .libs/lt-x09
                 libplplotcxxd.so.9 => /home/software/plplot_cvs/HEAD/plplot_working/bindings/c++/.libs/libplplotcxxd.so.9 (0x40018000)
         libstdc++.so.5 => /usr/lib/libstdc++.so.5 (0x40034000)
         libm.so.6 => /lib/tls/libm.so.6 (0x400ed000)
         libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x40110000)
         libc.so.6 => /lib/tls/libc.so.6 (0x40118000)
         libplplotd.so.9 => not found
         libplplotd.so.9 => /home/software/plplot_cvs/HEAD/plplot_working/src/.libs/libplplotd.so.9 (0x40254000)
         /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
         libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x40298000)
         libcsirocsa.so.0 => /home/software/plplot_cvs/HEAD/plplot_working/lib/csa/.libs/libcsirocsa.so.0 (0x40305000)
         libcsironn.so.0 => /home/software/plplot_cvs/HEAD/plplot_working/lib/nn/.libs/libcsironn.so.0 (0x4030c000)
         libdl.so.2 => /lib/tls/libdl.so.2 (0x40314000)
         libz.so.1 => /usr/lib/libz.so.1 (0x40317000)
         libqhull.so.5 => /usr/lib/libqhull.so.5 (0x40328000)

Apparently there are two attempts (one failing and one succeeding) to find
libplplotd.so.9 for .libs/lt-x09.  I have never seen that before, and it must
be the result of some bad linking, but I don't see the difference in the
relink commands between x08 and x09 so it must somehow be generated by
the source code.

We are putting in a new fridge this afternoon so it will probably be this
evening before I have time to read my e-mail again.  Meanwhile, though, the
release process is on hold, and Rafael and I have little time to spend on
this (we both have July 1st deadlines looming), and I hope that somebody
else will step forward and solve the above linking problem (when no aspect
of plplot is installed) with make check for a subset of the examples.

Alan
__________________________
Alan W. Irwin
email: ir...@be...
phone: 250-727-2902

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the PLplot scientific plotting software
package (plplot.org), the Yorick front-end to PLplot (yplot.sf.net), the
Loads of Linux Links project (loll.sf.net), and the Linux Brochure Project
(lbproject.sf.net).
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