[Octave-bug-tracker] [bug #63462] sscanf reports incorrect number of output values.

[Rik]

Follow-up Comment #11, bug #63462 (project octave):

I believe the PCRE linkage question is a red herring.  The code for scanf
relies on Octave hand-rolled code as well as the C/C++ standard library, but
not on regular expressions.  However, the linkage question should be
investigated and probably deserves its own bug report.

Also, the decimal format "%d" uses a different code path than the code for
floating point values ("%f", "%g") so this, unfortunately, doesn't help narrow
things down.

The system seems to be fairly generic Linux, X86_64 and 5.4 kernel.  The gcc
is version 9.4.0 while mine 11.2.  Maybe there is a bug reported against
libstdc++ for this version?

This could be hard to debug.

I notice from the config.log that you are setting some compilation flags to
point to "/usr/local/XXX" versions.  


  $ ../octave/configure --prefix=/opt/octave-default LDFLAGS=-L/usr/local/lib
-Wl,-rpath=/usr/local/lib CPPFLAGS=-I/usr/local/include
--with-umfpack-includedir=/usr/local/include
--with-umfpack-libdir=/usr/local/lib


This shouldn't be a problem, but I don't do that for my compilation so that is
one difference.  Is it possible that you are picking up some different
versions of libraries in /usr/local/lib?

Another thing is that my ldd output is much smaller. My output is


ldd src/.libs/octave-gui
        linux-vdso.so.1 (0x00007ffebadfd000)
        liboctgui.so.8 => not found
        liboctinterp.so.10 => not found
        liboctave.so.9 => not found
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6
(0x00007f39887f1000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1
(0x00007f39887d1000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f39885a7000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f39884c0000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f3988a43000)


By contrast, your setup seems to be picking up some installed libraries


       liboctgui.so.8 => /opt/octave-default/lib/octave/9.0.0/liboctgui.so.8
(0x00007f238063e000)
        liboctinterp.so.10 =>
/opt/octave-default/lib/octave/9.0.0/liboctinterp.so.10 (0x00007f237f1b8000)
        liboctave.so.9 => /opt/octave-default/lib/octave/9.0.0/liboctave.so.9
(0x00007f237dffa000)


Grasping at straws here, but maybe you need to do "make install" to replace
existing versions of Octave libraries on the hard drive which still have the
bug in them.



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