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From:	"Jonadab the Unsightly One" <jonadab AT bright DOT net>
Organization:	There is no organisation.
To:	cygwin AT cygwin DOT com
Date:	Thu, 5 Apr 2001 09:16:59 -0400
MIME-Version:	1.0
Subject:	libpng
Reply-to:	jonadab AT bright DOT net
Message-ID:	<3ACC380B.17460.433A2EC@localhost>
X-Eric-Conspiracy:	My name is not Eric.
X-Platform:	Windows '95 OSR2 (heavily adjusted and customised)
X-mailer:	Pegasus Mail for Win32 (v3.12)

'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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