Re: libtool/make and sysroot

[Daniel Herring]

On Sun, 21 Mar 2010, Ersin Akinci wrote:
> I've been trying to build DirectFB, and I think that I've narrowed down a bug 
> in the build process to what might be a confusing
> make or libtool behavior.  I've been cross-compiling using --sysroot for gcc so 
> that everything will link against a custom set
> of libraries that I've built.  Here's my full configure line (the important 
> part is to note that
> --sysroot=/home/ersin/vorpo/toolchain):
...
> DirectFB chokes, however, when it starts to build a certain tool, 
> directfb-csource, that requires libpng.  Here's the relevant
> part from the build:
>
> address@hidden DirectFB-1.4.3]$ make directfb-csource
> make -C tools directfb-csource                      
> make[1]: Entering directory `/home/ersin/vorpo/build/DirectFB-1.4.3/tools'
> i386-linux-gcc --sysroot=/home/ersin/vorpo/toolchain -DHAVE_CONFIG_H -I. -I.. 
> -I../lib -I../include -I../include -I../lib
> -I../src -DDATADIR=\"/usr/share/directfb-1.4.3\" -D_REENTRANT  
> -I/usr/include/freetype2   -O3 -ffast-math -pipe -Os
> -D_GNU_SOURCE  -Werror-implicit-function-declaration -MT directfb-csource.o -MD 
> -MP -MF .deps/directfb-csource.Tpo -c -o
> directfb-csource.o directfb-csource.c                                   
> mv -f .deps/directfb-csource.Tpo .deps/directfb-csource.Po                      
>                            
> /bin/sh ../libtool --tag=CC   --mode=link i386-linux-gcc 
> --sysroot=/home/ersin/vorpo/toolchain -I/usr/include/freetype2   -O3
> -ffast-math -pipe -Os -D_GNU_SOURCE  -Werror-implicit-function-declaration   -o 
> directfb-csource directfb-csource.o -lpng12 -ldl
> -lpthread                                                           
> mkdir .libs                                                                     
>                            
> i386-linux-gcc --sysroot=/home/ersin/vorpo/toolchain -I/usr/include/freetype2 
> -O3 -ffast-math -pipe -Os -D_GNU_SOURCE
> -Werror-implicit-function-declaration -o directfb-csource directfb-csource.o  
> /usr/lib/libpng12.so -ldl -lpthread
> /home/ersin/vorpo/build/buildroot-2010.02/output/staging/usr/bin-ccache/../lib/gcc/i386-linux-uclibc/4.3.4/../../../../i386-lin
> ux-uclibc/bin/ld: warning: libm.so.6, needed by /usr/lib/libpng12.so, not found 
> (try using -rpath or -rpath-link)
> /home/ersin/vorpo/build/buildroot-2010.02/output/staging/usr/bin-ccache/../lib/gcc/i386-linux-uclibc/4.3.4/../../../../i386-lin
> ux-uclibc/bin/ld: warning: libc.so.6, needed by /usr/lib/libpng12.so, not found 
> (try using -rpath or -rpath-link)
> /usr/lib/libpng12.so: undefined reference to address@hidden'
...
> collect2: ld returned 1 exit status
> make[1]: *** [directfb-csource] Error 1
> make[1]: Leaving directory `/home/ersin/vorpo/build/DirectFB-1.4.3/tools'
> make: *** [directfb-csource] Error 2
> address@hidden DirectFB-1.4.3]$
>
> Something strange is going on here.  Look at the lines after "mkdir .libs" 
> carefully:

It looks like libtool is reading the wrong .la file and changing paths on 
you.  The output of `libtool --version` might be useful.  For proper 
debugging,

# cd /home/ersin/vorpo/build/DirectFB-1.4.3/tools
# /bin/sh ../libtool --debug --tag=CC   --mode=link i386-linux-gcc 
--sysroot=/home/ersin/vorpo/toolchain -I/usr/include/freetype2 -O3 
-ffast-math -pipe -Os -D_GNU_SOURCE -Werror-implicit-function-declaration  
-o directfb-csource directfb-csource.o -lpng12 -ldl -lpthread > 
libtool-debug.txt

Search this for the first occurrance of /usr/lib/libpng12.so and then look 
backwards for a .la.  Or just grep the /usr/lib/libpng12.la text file. 
If you find this path in an offending .la file, rename that file to 
.la-bak and try recompiling.

These .la files can be absolutely essential in some situations, and a 
complete nightmare in others.

The .la file problem is my first guess.  If its not the issue, then upload 
the libtool-debug.txt file to a paste bin somewhere and submit a link to 
this list.

- Daniel