Re: libpng

["Charles S. Wilson" <cwilson at ece dot gatech dot edu>]

The PoV source code contains an outdated version of libpng.  libpng
since 1.06 has contained a "makefile.cygwin" script.  Download the newer
version of libpng and build that. 

Or use the pre-compiled version of libpng and its headers that is part
of the official distribution and is available from your local cygwin
mirror in the "contrib" directory.

--Chuck
libpng maintainer for cygwin

Jonadab the Unsightly One wrote:
> 
> 'ello.
> 
> To get some practice compiling stuff and getting it to work
> in cygwin, I downloaded the Persistence of Vision source
> so I can start with that.  It includes zlib (which seems
> to have built with no problems) and libpng (which seems
> more complicated).  There are a number of makefiles, but
> only three of them use gcc.  Of those three, one is for
> a certain version of Solaris; another is for Linux, and
> the third for OS/2.  I figured cygwin is closer to Linux
> than either of those others (yes?  no?  Is that still not
> close enough?) and chose that one, but partway through I
> get the following:
> 
> cc1.exe: warning: -fPIC ignored for target (all code is position independent)
> cc1.exe: warning: -fPIC ignored for target (all code is position independent)
> cc1.exe: warning: -fPIC ignored for target (all code is position independent)
> cc1.exe: warning: -fPIC ignored for target (all code is position independent)
> cc1.exe: warning: -fPIC ignored for target (all code is position independent)
> cc1.exe: warning: -fPIC ignored for target (all code is position independent)
> cc1.exe: warning: -fPIC ignored for target (all code is position independent)
> cc1.exe: warning: -fPIC ignored for target (all code is position independent)
> cc1.exe: warning: -fPIC ignored for target (all code is position independent)
> cc1.exe: warning: -fPIC ignored for target (all code is position independent)
> cc1.exe: warning: -fPIC ignored for target (all code is position independent)
> cc1.exe: warning: -fPIC ignored for target (all code is position independent)
> cc1.exe: warning: -fPIC ignored for target (all code is position independent)
> cc1.exe: warning: -fPIC ignored for target (all code is position independent)
> cc1.exe: warning: -fPIC ignored for target (all code is position independent)
> Cannot export _bss_end__: symbol not defined
> Cannot export _bss_start__: symbol not defined
> Cannot export _data_end__: symbol not defined
> Cannot export _data_start__: symbol not defined
> collect2: ld returned 1 exit status
> make: *** [libpng.so.2.1.0.3] Error 1
> 
> For context, I think the last couple of things that happened
> before that are as follows:
> 
> gcc -c -I../zlib -Wall -O3 -funroll-loops   -fPIC -o pngpread.pic.o
> pngpread.c
> gcc -shared -Wl,-soname,libpng.so.2 -o libpng.so.2.1.0.3 \
>  png.pic.o pngset.pic.o pngget.pic.o pngrutil.pic.o pngtrans.pic.o
> pngwutil.pic.
> o pngread.pic.o pngrio.pic.o pngwio.pic.o pngwrite.pic.o pngrtran.pic.o
> pngwtran
> .pic.o pngmem.pic.o pngerror.pic.o pngpread.pic.o -L../zlib -lz -lm -lc
> 
> Does anyone have a makefile that works for libpng under cygwin,
> or any advice for how to create one (bearing in mind that my
> experience with make is less than my experience with cygwin)?
> I have gcc version 2.95.2-5
> 
> -- jonadab
> 
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