[gst-devel] helloworld build problems

Rajesh K gstdoubts at gmail.com
Tue Dec 23 11:20:11 CET 2008 

Hi,
I made the following modification in my Makefile posted in the previous
mail( I looked at the Makefile generated by configure and picked the ideas
from there)

libtool --tag=CC --mode=link $(CC) $(GST_INCLUDE_DIR) $(GLIB_INCLUDE_DIR) -o
playbin playbin.c  $(GST_LIB_DIR) $(GLIB_LIB_DIR) $(GST_GLIB_LIBS) -pthread

and this is the command that runs at the prompt.


gcc -I/users/rajesh/gstreamer_build/GST/include/gstreamer-0.10/
-I/usr/include/libxml2/
-I/users/rajesh/gstreamer_build/GLIB/include/glib-2.0
-I/users/rajesh/gstreamer_build/GLIB/lib/glib-2.0/include -o playbin
playbin.c  -L/users/rajesh/gstreamer_build/GST/lib
-L/users/rajesh/gstreamer_build/GLIB/lib/
/users/rajesh/gstreamer_build/GST/lib/libgstreamer-0.10.so-L/users/rajesh/gstreamer_build/GLIB/lib
/users/rajesh/gstreamer_build/GLIB/lib/libgobject-2.0.so/users/rajesh/gstreamer_build/GLIB/lib/
libgthread-2.0.so -lrt /users/rajesh/gstreamer_build/GLIB/lib/
libgmodule-2.0.so -ldl
/users/rajesh/gstreamer_build/GLIB/lib/libglib-2.0.so/usr/lib/libxml2.so
-lpthread -lz -lm -pthread -Wl,--rpath
-Wl,/users/rajesh/gstreamer_build/GST/lib -Wl,--rpath
-Wl,/users/rajesh/gstreamer_build/GLIB/lib -Wl,--rpath
-Wl,/users/rajesh/gstreamer_build/GST/lib -Wl,--rpath
-Wl,/users/rajesh/gstreamer_build/GLIB/lib

That means make is some how resolving the library paths and setting them to
user defined locations rather than system specified paths.
I read somewhere that -Wl,--rpath results in hardcoding of the library
locations and hence  the implementation is not portable.

*Can somebody please explain, what exactly happened when I included the
libtool --tag=CC --mode=link ?

*
Now if I do
$ldd ./playbin
        libgstreamer-0.10.so.0 =>
/users/rajesh/gstreamer_build/GST/lib/libgstreamer-0.10.so.0 (0x005a1000)
        libgobject-2.0.so.0 =>
/users/rajesh/gstreamer_build/GLIB/lib/libgobject-2.0.so.0 (0x00e5b000)
        libgthread-2.0.so.0 =>
/users/rajesh/gstreamer_build/GLIB/lib/libgthread-2.0.so.0 (0x00ead000)
        librt.so.1 => /lib/tls/librt.so.1 (0x00111000)
        libgmodule-2.0.so.0 =>
/users/rajesh/gstreamer_build/GLIB/lib/libgmodule-2.0.so.0 (0x00125000)
        libdl.so.2 => /lib/libdl.so.2 (0x008c9000)
        libglib-2.0.so.0 =>
/users/rajesh/gstreamer_build/GLIB/lib/libglib-2.0.so.0 (0x002a8000)
        libxml2.so.2 => /usr/lib/libxml2.so.2 (0x07d22000)
        libpthread.so.0 => /lib/tls/libpthread.so.0 (0x009ba000)
        libz.so.1 => /usr/lib/libz.so.1 (0x008cf000)
        libm.so.6 => /lib/tls/libm.so.6 (0x008a4000)
        libc.so.6 => /lib/tls/libc.so.6 (0x00778000)
        /lib/ld-linux.so.2 (0x0075b000)
All of them have the specified paths
Regards
Rajesh



On Tue, Dec 23, 2008 at 11:57 AM, Rajesh K <gstdoubts at gmail.com> wrote:

> Hi,
> I have installed the glib and gstreamer-0.10.21 in
> /users/rajesh/gstreamer_build/GLIB and /users/rajesh/gstreamer_build/GSt
> respectively
> I am trying to build the helloworld example in
> gstreamer-0.10.21/tests/examples/manual/
> I have written my own make file as follows.
> where $HOME is /users/rajesh/
> MAKEFILE
>
> ****************************************************************************************
>
> CC = gcc
> GLIB_INCLUDE_DIR =-I/users/rajesh/gstreamer_build/GLIB/include/glib-2.0
> -I/users/rajesh/gstreamer_build/GLIB/lib/glib-2.0/include
> GLIB_LIB_DIR = -L/users/rajesh/gstreamer_build/GLIB/lib/
>
> GST_INCLUDE_DIR=-I$(HOME)/gstreamer_build/GST/include/gstreamer-0.10/
> -I/usr/include/libxml2/
> GST_LIB_DIR=-L$(HOME)/gstreamer_build/GST/lib
>
> PKG_CONFIG_PATH=$(HOME)/gstreamer_build/GST/lib/pkgconfig/
> GST_GLIB_LIBS= -lgstreamer-0.10 -lgobject-2.0 -lgthread-2.0 -lrt
> -lgmodule-2.0 -ldl -lglib-2.0 -lxml2
>
> all: clean playbin
> playbin:
>         $(CC) $(GST_INCLUDE_DIR) $(GLIB_INCLUDE_DIR) -o playbin playbin.c
> $(GST_LIB_DIR) $(GLIB_LIB_DIR) $(GST_GLIB_LIBS) -pthread
> clean:
>         rm -rf playbin *.o
>
> **********************************************************************************************************************
> the executable playbin is built
> The I set the LD_LIBRARY_PATH as follows
> $set
> LD_LIBRARY_PATH=($HOME/gstreamer_build/GST/include/gstreamer-0.10/:$HOME/gstreamer_build/GST/lib/:$LD_LIBRARY_PATH)
> when I try to run playbin
> It says it cannot find the shared library libgstreamer-0.10.21
> ldd produces the following output
> $ldd ./playbin
>         libgstreamer-0.10.so.0 => not found
>         libgobject-2.0.so.0 => /usr/lib/libgobject-2.0.so.0 (0x00c65000)
>         libgthread-2.0.so.0 => /usr/lib/libgthread-2.0.so.0 (0x00688000)
>         librt.so.1 => /lib/tls/librt.so.1 (0x005bf000)
>         libgmodule-2.0.so.0 => /usr/lib/libgmodule-2.0.so.0 (0x00c60000)
>         libdl.so.2 => /lib/libdl.so.2 (0x008c9000)
>         libglib-2.0.so.0 => /usr/lib/libglib-2.0.so.0 (0x00af6000)
>         libxml2.so.2 => /usr/lib/libxml2.so.2 (0x07d22000)
>         libpthread.so.0 => /lib/tls/libpthread.so.0 (0x009ba000)
>         libc.so.6 => /lib/tls/libc.so.6 (0x00778000)
>         /lib/ld-linux.so.2 (0x0075b000)
>         libz.so.1 => /usr/lib/libz.so.1 (0x008cf000)
>         libm.so.6 => /lib/tls/libm.so.6 (0x008a4000)
>
> I don't understand
> 1.why it is not able to detect libgstreamer-0.10.21
> 2.why the default library paths are being set for other libarires
>
> Any clues on this?
> Regards
> Rajesh
>
>
>
>
>
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