[ncl-install] grib2c library not linking png and jpeg libraries

[Mary Haley]

Hi May,

I think this was a bug in the ymake system for NCL. You 
need to link in the PNG library if you enable PNG support 
for GRIB2.

To fix this, look at the file $NCARG/config/Project for a 
line that starts with "#define GRIB2lib".

Change this line to be:

#define  GRIB2lib  -lgrib2c -ljasper -lpng -lz

To test if this fix works, type the following:

    cd $NCARG/ni/src/ncl
   make me
   make all install

If this works, then you can finish your NCL/NCAR Graphics 
make with:

   cd $NCARG
   make all install >&! make-output-2

I'm using "$NCARG" to represent the top directory of the 
NCL/NCAR Graphics source tree.

I'll add this to our troubleshooting guide.

--Mary

On Fri, 9 Jan 2009 11:11:05 +0800
  "Tzung-May Fu" <cetmfu at polyu.edu.hk> wrote:
> Hi all -
> 
> I'm trying to build NCL with GRIB2 support.  The OS is 
>Ubuntu linux, and I am using Intel C and Fortran 
>compilers.
> 
> During 'make Everything' for NCL, here's the error 
>message I got:
> 
>        /home/tmfu/testlib/lib/libgrib2c.a(dec_png.o): In 
>function 
> `dec_png':
>        dec_png.c:(.text+0x99): undefined reference to 
> `png_create_read_struct'
>        dec_png.c:(.text+0x11f): undefined reference to 
>`png_set_read_fn'
>        dec_png.c:(.text+0x136): undefined reference to 
>`png_read_png'
>        dec_png.c:(.text+0x149): undefined reference to 
>`png_get_rows'
>        dec_png.c:(.text+0x18a): undefined reference to 
>`png_get_IHDR'
>        dec_png.c:(.text+0x319): undefined reference to 
> `png_destroy_read_struct'
>        dec_png.c:(.text+0x36a): undefined reference to 
> `png_destroy_read_struct'
>        dec_png.c:(.text+0x39d): undefined reference to 
> `png_destroy_read_struct'
>        dec_png.c:(.text+0x3cb): undefined reference to 
> `png_destroy_read_struct'
>        make[4]: *** [ncl] Error 1
> 
> So I read Rick's reply on this thread:
> http://www.ncl.ucar.edu/Support/install_archives/2008/0119.html
> 
> And I checked my libgrib2c.a compilation.  Here's the 
>strange part.  My makefile seems correct:
> 
>        DEFS=-DUSE_JPEG2000 -DUSE_PNG
>        INC=-I/home/tmfu/testlib/include
>        LDFLAGS=-L/home/tmfu/testlib/lib
>        LIBS=-ljpeg -lpng
>        #CFLAGS= $(INC) $(DEFS)   # <----- I also trited 
>this
>        CFLAGS= $(INC) $(DEFS) $(LDFLAGS) $(LIBS)
> 
>        CC=icc
>        LIB=libgrib2c.a
>        ARFLAGS=
> 
> But the resulting 'libgrib2c.a' is somehow not linking 
>PNG and JPEG libraries correctly.  I did an 'nm' on 
>'libgrib2c.a':
> 
>        nm libgrib2c.a | grep png
> 
> Here's what I got:
>                         U pngunpack
>        pngpack.o:
>                         U enc_png
>        0000000000000000 T pngpack
>        pngunpack.o:
>                     U dec_png
>        0000000000000000 T pngunpack
>        dec_png.o:
>        0000000000000030 T dec_png
>                         U png_create_info_struct
>                         U png_create_read_struct
>                         U png_destroy_read_struct
>                         U png_get_IHDR
>                         U png_get_io_ptr
>                         U png_get_rows
>                         U png_read_png
>                         U png_set_read_fn
>                         U png_sig_cmp
>        enc_png.o:
>        0000000000000040 T enc_png
>                         U png_create_info_struct
>                         U png_create_write_struct
>                         U png_destroy_write_struct
>                         U png_get_io_ptr
>                         U png_set_IHDR
>                         U png_set_rows
>                         U png_set_write_fn
>                         U png_write_png
>                         U pngpack
> 
> So it seems that these functions are really NOT defined 
>in 'libgrib2c.a'.  I did check to see the same functions 
>are defined in 'libpng.a'.
> 
> The only clue I can find is during 'make all' for grib2c 
>libraries, the following warning message appeared:
> 
>        icc -c -I/home/tmfu/testlib/include 
>-DUSE_JPEG2000 -DUSE_PNG -L/home/tmfu/testlib/lib 
> -ljpeg -lpng  pngunpack.c
>        pngunpack.c(63): warning #167: argument of type 
>"unsigned char *" is 
> incompatible with parameter of type "char *"
>                   iret=(g2int)dec_png(cpack,&width,&height,ctemp);
>                                                        ^
>        pngunpack.c(72): (col. 10) remark: LOOP WAS 
>VECTORIZED.
> 
> The same problem exists with the JPEG libraries in 
>'libgrib2c.a'.  I've tried using gcc instead of icc, 
>different ways of linking the libraries, and even copying 
>all JPEG and PNG libraries and include files to the 
>grib2c code directory.  Same result every time.
> 
> If anybody have any suggestion, I would very much 
>appreciate it!   Thanks in advance.
> 
> Regards,
> May Fu
> 
> 
> 
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