[OctDev] Compile failures in octave-forge with CVS octave

[Quentin S. <qsp...@ie...>]

I tried compiling the cvs version of octave-forge with the cvs version 
of octave, and two functions failed to compile:

1. main/fixed/fixedNDArray.cc

fixedNDArray.o
fixedNDArray.cc:407:59: error: macro "MX_ND_REDUCTION" passed 5 
arguments, but takes just 3
fixedNDArray.cc:421:61: error: macro "MX_ND_REDUCTION" passed 5 
arguments, but takes just 3
fixedNDArray.cc:436:61: error: macro "MX_ND_REDUCTION" passed 5 
arguments, but takes just 3

This appears to be caused by recent changes to octave. I don't know 
enough about this code to debug it, but from looking at it, it appears 
that this macro has changed periodically in the past and there is 
already some cruft in the code to handle different cases. To whoever 
fixes this I suggest removing the old stuff since we are trying to clean 
up before octave 3.0.


2. main/image/pngread.cc

/usr/include/pngconf.h:307: error: expected constructor, destructor, or 
type conversion before ‘.’ token
/usr/include/pngconf.h:308: error: ‘__dont__’ does not name a type
pngread.cc: In function ‘canvas* load_canvas(char*)’:
pngread.cc:156: warning: ignoring return value of ‘size_t fread(void*, 
size_t, size_t, FILE*)’, declared with attribute warn_unused_result

I'm not sure what's causing this. I'm using Fedora Core 4, with 
libpng-1.2.8-2 installed, and the compiler is gcc 4.0.1.

I have a related question to this. I see that octave-forge now has the 
option of using ImageMagick++, but I didn't follow the earlier 
discussion about this closely. Is this intended to provide new features 
that are unavailable in libjpg and libpng, or does it provide an 
alternate way of getting the same features? This will influence whether 
I add ImageMagick-c++-devel as a build dependency for the Fedora Extras 
octave-forge package.

-Quentin