Re: [Plplot-devel] Splitting off libpltcl and greatly simplifying library linking options

[Maurice L. <mj...@ga...>]

Alan W. Irwin writes:
 > I have just committed my changes to split out the pltcl library and I
 > also greatly simplified the linking flags.  The old model for linking flags
 > was to "throw in everything but the kitchen sink until the sucker worked".
 > The new model is to attempt to link just what is required and nothing more.
 > 
 > With the new model, applications only link libplplot (which is quite
 > convenient); libplplot only links libpltcl, the normal list of dynamic
 > drivers, and libg2c (the library required in Linux for fortran); and finally
 > libpltcl links the tcl, itcl, tk, itk, xwin, libtclmatrix, and the special
 > dynamic drivers.
 > 
 > These changes have been tested (my usual interactive and non-interactive
 > tests) in the plplot/tmp location and also in an arbitrary location with the
 > result installed with prefix = /usr/local/plplot.  I used the configure
 > options --with-double --enable-dyndrivers --enable-java --enable-gnome
 > --enable-ntk --enable-tkwin
 > ...
 > I believe the current scheme will work also for --disable-dyndrivers.  The
 > idea there is the special drivers get absorbed into libpltcl and the rest
 > get absorbed into libplplot.  But I haven't tested this at all.

At least one problem so far.  If enable_png or enable_jpeg are set, nothing
links because the -lgd flag is nowhere to be found.  Here's my output:

cd shared; \
gcc -shared -fPIC -o ../libplplot.so.5.1.0 \
        -Wl,-soname -Wl,libplplot.so.5 \
        pdfutils.o plargs.o plbox.o plbuf.o plcont.o plcore.o plctrl.o plcvt.o pldtik.o plfill.o plhist.o plline.o plmap.o plot3d.o plpage.o plsdef.o plshade.o plsym.o pltick.o plvpor.o plwind.o plstripc.o plimage.o plmeta.o null.o gd.o ps.o tk.o pbm.o pstex.o    -L.. -ltclmatrix -lpltcl 
ln -sf libplplot.so.5.1.0 libplplot.so.5
ln -sf libplplot.so.5 libplplot.so

gcc -g   plrender.o -L. -lplplot -o plrender \
         -Wl,-rpath -Wl,/home/mjl/dev/plplot/latest/tmp
./libplplot.so: undefined reference to `gdImageColorAllocate'
./libplplot.so: undefined reference to `gdImageColorDeallocate'
./libplplot.so: undefined reference to `gdImageDestroy'
./libplplot.so: undefined reference to `gdImageLine'
./libplplot.so: undefined reference to `gdImagePng'
./libplplot.so: undefined reference to `gdImageJpeg'
./libplplot.so: undefined reference to `gdImageCreate'
./libplplot.so: undefined reference to `gdImageFilledPolygon'
collect2: ld returned 1 exit status
make: *** [plrender] Error 1

and ditto for x01c, etc.  I suppose it's an easy fix but I don't see it.
Since you did the change maybe you'll find it quicker than I..

Will let you know if any other problems arise.

-- 
Maurice LeBrun    mj...@ga...
Research Organization for Information Science and Technology of Japan (RIST)