Problem with libpng

--- Quote Start ---

originally posted by leewood@Jul 31 2006, 02:27 AM

hi,

i compiled the kernel with building libpng (kernel/library/defaul tselection->customize vendor /user settings->library configuration->build libpng).i have selected building libz which was needed by libpng.

but it failed.the error as follow:

.......

make[2]: entering directory `/home/leewood/uclinux-dist-test/include'

find . -depth -type l -a ! -name makefile | xargs rm > /dev/null 2>&1 || exit 0

find . -depth -type d | xargs rmdir > /dev/null 2>&1 || exit 0

making symlinks in include/

making include/c++ symlink to compiler c++ includes

make[2]: leaving directory `/home/leewood/uclinux-dist-test/include'

make[2]: entering directory `/home/leewood/uclinux-dist-test/lib'

making symlinks in lib/

make[2]: leaving directory `/home/leewood/uclinux-dist-test/lib'

make[2]: entering directory `/home/leewood/uclinux-dist-test/include'

find . -depth -type l -a ! -name makefile | xargs rm > /dev/null 2>&1 || exit 0

find . -depth -type d | xargs rmdir > /dev/null 2>&1 || exit 0

making symlinks in include/

making include/c++ symlink to compiler c++ includes

make[2]: leaving directory `/home/leewood/uclinux-dist-test/include'

make[2]: entering directory `/home/leewood/uclinux-dist-test/lib'

making symlinks in lib/

make[2]: leaving directory `/home/leewood/uclinux-dist-test/lib'

make[2]: entering directory `/home/leewood/uclinux-dist-test/lib/zlib'

make[2]: nothing to be done for `all'.

make[2]: leaving directory `/home/leewood/uclinux-dist-test/lib/zlib'

make[2]: entering directory `/home/leewood/uclinux-dist-test/lib'

making symlinks in lib/

make[2]: leaving directory `/home/leewood/uclinux-dist-test/lib'

make[2]: entering directory `/home/leewood/uclinux-dist-test/lib/libpng'

nios2-linux-uclibc-gcc -shared -wl,-soname,libpng.so.2 -o libpng.so.2.1.0.12

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

nios2-linux-uclibc-gcc: unrecognized option `-shared'

/opt/nios2/lib/gcc/nios2-linux-uclibc/3.4.6/../../../../nios2-linux-uclibc/lib/crt1.o(.text+0x10): in function `_start':

: undefined reference to `main'

/opt/nios2/lib/gcc/nios2-linux-uclibc/3.4.6/../../../../nios2-linux-uclibc/lib/crt1.o(.text+0x14): in function `_start':

: undefined reference to `main'

collect2: ld returned 1 exit status

make[2]: *** [libpng.so.2.1.0.12] 错误 1

make[2]: leaving directory `/home/leewood/uclinux-dist-test/lib/libpng'

make[1]: *** [all] 错误 2

make[1]: leaving directory `/home/leewood/uclinux-dist-test/lib'

make: *** [subdirs] 错误 1

[leewood@localhost uclinux-dist-test]$

pls help.thanks!

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=17277)

--- quote end ---

--- Quote End ---

hi leewood,

You might have solved problem by your self, but if not, then here is the reason......

nios2-linux-uclibc-gcc: unrecognized option `-shared'

nios2-linux-uclibc-gcc does not compile shared libraries, you need to compile libpng lib as static.

nios2-linux-uclibc-gcc will not take "-g", "-shared" options.

What you need to do is ..... in configure script either give "static" option or either remove "-shared" from your all Makefiles.

Do remember to make distclean your code : ).

thanks,

Ankur

Hi, Ankur

I have done what you told me......"in configure script either give "static" option or either remove "-shared" from your all Makefiles."

But the result is

.......

make[2]: Entering directory `/home/leewood/uClinux-dist-test/lib/libpng&#39;

nios2-linux-uclibc-gcc -static -Wl,-soname,libpng.so.2 -o libpng.so.2.1.0.12

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

/opt/nios2/lib/gcc/nios2-linux-uclibc/3.4.6/../../../../nios2-linux-uclibc/lib/c rt1.o(.text+0x10): In function `_start&#39;:

: undefined reference to `main&#39;

/opt/nios2/lib/gcc/nios2-linux-uclibc/3.4.6/../../../../nios2-linux-uclibc/lib/c rt1.o(.text+0x14): In function `_start&#39;:

: undefined reference to `main&#39;

collect2: ld returned 1 exit status

make[2]: *** [libpng.so.2.1.0.12] &#38169;&#35823; 1

make[2]: Leaving directory `/home/leewood/uClinux-dist-test/lib/libpng&#39;

make[1]: *** [all] &#38169;&#35823; 2

make[1]: Leaving directory `/home/leewood/uClinux-dist-test/lib&#39;

make: *** [subdirs] &#38169;&#35823; 1

[leewood@localhost uClinux-dist-test]$

In fact,I want to add the application "vidcat" (Miscellaneous Application->Video tools->vidcat) into my kernel. It needs libz,libpng and libjpeg builded before. The libz and libjpeg have been builded, but libpng always failed.

Pls help.Thanks!

--- Quote Start ---

originally posted by leewood@Jul 31 2006, 05:16 PM

in fact,i want to add the application "vidcat" (miscellaneous application->video tools->vidcat) into my kernel. it needs libz,libpng and libjpeg builded before. the libz and libjpeg have been builded, but libpng always failed.

pls help.thanks!

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=17296)

--- quote end ---

--- Quote End ---

Take a look at your two successful library builds and find out what command was used to create the static library. (something like libpng.a)

Also, it&#39;s pretty likely that the libpng makefile already knows how to build the archive library (.a extension) as that is a typical build target on systems that are capable of building and using shared libraries.

Cheers,

- slacker

Hi,slacker

I do not understand...."it&#39;s pretty likely that the libpng makefile already knows how to build the archive library (.a extension) as that is a typical build target on systems that are capable of building and using shared libraries."

So I paste the Makefile as follow:

# makefile for libpng on Linux ELF with gcc# Copyright © 1998, 1999 Greg Roelofs# Copyright © 1996, 1997 Andreas Dilger# For conditions of distribution and use, see copyright notice in png.h

# CC=gcc

# where "make install" puts libpng.a, libpng.so*, png.h and pngconf.h

prefix=/usr/local

# Where the zlib library and include files are located# ZLIBLIB=/usr/local/lib# ZLIBINC=/usr/local/include

ZLIBLIB=../zlib

ZLIBINC=../zlib

ALIGN=# for i386:# ALIGN=-malign-loops=2 -malign-functions=2

WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow

-Wmissing-declarations -Wtraditional -Wcast-align

-Wstrict-prototypes -Wmissing-prototypes# -Wconversion

# for pgcc version 2.95.1, -O3 is buggy; don&#39;t use it.

CFLAGS += -I$(ZLIBINC) -Wall -O3 -funroll-loops

$(ALIGN)# $(WARNMORE) -g -DPNG_DEBUG=5# LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz -lm

# RANLIB=ranlib# RANLIB=echo

# read libpng.txt or png.h to see why PNGMAJ is 2. You should not# have to change it.

PNGMAJ = 2

PNGMIN = 1.0.12

PNGVER = $(PNGMAJ).$(PNGMIN)

INCPATH=$(prefix)/include

LIBPATH=$(prefix)/lib

OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o

pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o

pngwtran.o pngmem.o pngerror.o pngpread.o

OBJSDLL = $(OBJS:.o=.pic.o)

.SUFFIXES: .c .o .pic.o

.c.pic.o:

$(CC) -c $(CFLAGS) -fPIC -o $@ $*.c

# all: libpng.a libpng.so pngtest

all: libpng.a libpng.so

libpng.a: $(OBJS)

ar rc $@ $(OBJS)

$(RANLIB) $@

libpng.so: libpng.so.$(PNGMAJ)

ln -sf libpng.so.$(PNGMAJ) libpng.so

libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)

ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)

libpng.so.$(PNGVER): $(OBJSDLL)

$(CC) -Wl,-soname,libpng.so.$(PNGMAJ) -o libpng.so.$(PNGVER)

$(OBJSDLL) -L$(ZLIBLIB) -lz -lm -lc

pngtest: pngtest.o libpng.so

$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)

test: pngtest

./pngtest

install: libpng.a libpng.so.$(PNGVER)

-@if [ ! -d $(INCPATH) ]; then mkdir $(INCPATH); fi

-@if [ ! -d $(LIBPATH) ]; then mkdir $(LIBPATH); fi

cp png.h pngconf.h $(INCPATH)

chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h

cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)

chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)

-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so

(cd $(LIBPATH); ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ);

ln -sf libpng.so.$(PNGMAJ) libpng.so)

romfs:

if [ "$(CONFIG_X86)" = "y" ]; then

[ -d $(ROMFSDIR)/lib ] || mkdir -p $(ROMFSDIR)/lib ;

$(ROMFSINST) libpng.so.2 /lib/libpng.so.2 ;

fi

clean:

-/bin/rm -f *.o libpng.so* pngtest pngout.png

DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO

writelock:

chmod a-w *.[ch35] $(DOCS) scripts/*

# DO NOT DELETE THIS LINE -- make depend depends on it.

png.o png.pic.o: png.h pngconf.h

pngerror.o pngerror.pic.o: png.h pngconf.h

pngrio.o pngrio.pic.o: png.h pngconf.h

pngwio.o pngwio.pic.o: png.h pngconf.h

pngmem.o pngmem.pic.o: png.h pngconf.h

pngset.o pngset.pic.o: png.h pngconf.h

pngget.o pngget.pic.o: png.h pngconf.h

pngread.o pngread.pic.o: png.h pngconf.h

pngrtran.o pngrtran.pic.o: png.h pngconf.h

pngrutil.o pngrutil.pic.o: png.h pngconf.h

pngtrans.o pngtrans.pic.o: png.h pngconf.h

pngwrite.o pngwrite.pic.o: png.h pngconf.h

pngwtran.o pngwtran.pic.o: png.h pngconf.h

pngwutil.o pngwutil.pic.o: png.h pngconf.h

pngpread.o pngpread.pic.o: png.h pngconf.h

pngtest.o: png.h pngconf.h

What is wrong in it??Pls hlep.

Thanks

--leewood

--- Quote Start ---

originally posted by leewood@Jul 31 2006, 07:21 PM

what is wrong in it??pls hlep.

thanks

--leewood

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=17299)

--- quote end ---

--- Quote End ---

Your all target reads

all: libpng.a libpng.so

try changing it to read

all: libpng.a

.

If the compiler doesn&#39;t understand how to build "shared objects", then it doesn&#39;t make any sense to include the shared object (.so) target.

Cheers,

- slacker