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[Yasser Nour El-Din <ynour@xxxxxxxxxxxx>]

Sorry, i missed in linking adding the object of the the application,
generated from compilation step that's why it give error "undefined
reference to `main'".

In linking statically use this command for linking:

gcc -static -L./../rohc-1.2.0/ -o packetforwardrohc packetforwardrohc.o
-lrohc_decomp -lrohc_comp -lrohc_common -lm

Thanks
-
Yasser Nour El-Din

On Thu, 2009-10-08 at 14:27 +0200, Josephine Kakande wrote:
> Hi Yasser,
> 
> Thanks a lot for the feedback and suggestions.
> 
>         
>         Hello,
>         
>         I had a problem similar to this when trying to link statically
>         with rohc
>         libraries, and found that the order of libraries to link is
>         important.
>         
>         Here is the commands i use to link with rohc libraries:
>         
>         Compiling my application (rohc_proc.c):
>         
>         gcc -I./../RoHC-1.1.0 -I./../RoHC-1.1.0/include -c rohc_proc.c
>         -o
>         rohc_proc.o
>         
>         Then, Linking my application with rohc libraries:
>         
>         gcc -static -L./../RoHC-1.1.0/lib -lrohc_decomp -lrohc_comp
>         -lrohc_common -lm
>         
>         I noticed also you use absolute path in includes used in your
>         application:
>         
>         #include "/home/josie/rohc-1.2.0/src/common/rohc.h"
>         #include "/home/josie/rohc-1.2.0/src/comp/rohc_comp.h"
>         
>         i think it should be replaced by:
>         
>         #include "rohc.h"
>         #include "rohc_comp.h"
> 
> Thanks for the suggestion, I made the changes to the includes.
>  
> 
>         
>         and -I./../RoHC-1.2.0/include in the compilation flags should
>         take care
>         of translating this includes to absolute path.
>         
>         Can you please provide the commands or makefile you use for
>         building
>         your application with rohc library, and if you try to build it
>         statically?
> 
> 
> I've recompiled with this command and this is the error output:
> 
> 
> $ gcc packetforwardrohc.c -o packetforwardrohc -I/usr/include
> -L/usr/lib -lpcap `libnet-config --defines --cflags --libs`
> -lrohc_comp -lrohc_common -lm
> 
> 
> In file included from headers.h:8,
>                  from packetforwardrohc.c:24:
> /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:197: warning: ‘struct
> ip_packet’ declared inside parameter list
> /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:197: warning: its scope is
> only this definition or declaration, which is probably not what you
> want
> /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:205: warning: ‘struct
> ip_packet’ declared inside parameter list
> /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:210: warning: ‘struct
> ip_packet’ declared inside parameter list
> /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:279: warning: ‘struct
> ip_packet’ declared inside parameter list
> /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:280: warning: ‘struct
> ip_packet’ declared inside parameter list
> /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:290: warning: ‘struct
> ip_packet’ declared inside parameter list
> In file included from packetforwardrohc.c:24:
> headers.h:14:1: warning: "ETHER_ADDR_LEN" redefined
> In file included from /usr/include/libnet.h:57,
>                  from packetforwardrohc.c:23:
> /usr/include/net/ethernet.h:52:1: warning: this is the location of the
> previous definition
> packetforwardrohc.c: In function ‘got_packet’:
> packetforwardrohc.c:509: warning: passing argument 2 of
> ‘rohc_compress’ discards qualifiers from pointer target type
> /usr/lib/gcc/i486-linux-gnu/4.2.4/../../../../lib/crt1.o: In function
> `_start':
> (.text+0x18): undefined reference to `main'
> collect2: ld returned 1 exit status
> 
> Statically
> 
> 
> $ gcc -I./../rohc-1.2.0 -I./../rohc-1.2.0/src -c packetforward.c -o
> packetforward.o
> 
> In file included from packetforward.c:8:
> /usr/include/libnet.h:87:2: error: #error "byte order has not been
> specified, you'll" "need to #define either LIBNET_LIL_ENDIAN or
> LIBNET_BIG_ENDIAN.  See the" "documentation regarding the
> libnet-config script."
> In file included from headers.h:8,
>                  from packetforward.c:9:
> /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:197: warning: ‘struct
> ip_packet’ declared inside parameter list
> /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:197: warning: its scope is
> only this definition or declaration, which is probably not what you
> want
> /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:205: warning: ‘struct
> ip_packet’ declared inside parameter list
> /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:210: warning: ‘struct
> ip_packet’ declared inside parameter list
> /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:279: warning: ‘struct
> ip_packet’ declared inside parameter list
> /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:280: warning: ‘struct
> ip_packet’ declared inside parameter list
> /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:290: warning: ‘struct
> ip_packet’ declared inside parameter list
> packetforward.c:648:2: warning: no newline at end of file
> 
> 
> $ gcc -static -L./../rohc-1.2.0/ -lrohc_decomp -lrohc_comp
> -lrohc_common -lm
> 
> /usr/lib/gcc/i486-linux-gnu/4.2.4/../../../../lib/crt1.o: In function
> `_start':
> (.text+0x18): undefined reference to `main'
> collect2: ld returned 1 exit status
> josie@josie-laptop:~/packetforward$ 
> 
> Kindly advise.
> 
> Thanks,
> Josephine
> 
>         
>         
>         
>         On Wed, 2009-10-07 at 22:49 +0200, Josephine Kakande wrote:
>         > Hello,
>         >
>         > I'm wondering if anyone has been able to figure out a
>         solution to my
>         > problem.
>         >
>         > I'd really appreciate your feedback.
>         >
>         > Thanks and regards,
>         > Josephine
>         >
>         > On Wed, Sep 23, 2009 at 11:27 AM, Josephine Kakande
>         > <jnkakande@xxxxxxxxx> wrote:
>         >
>         >         Hello,
>         >
>         >         I'm trying to use the rohc-compressor in a program
>         I'm using
>         >         for packet injection.
>         >
>         >         However I get the following error when i attempt to
>         compile :
>         >
>         >
>         >         In file included from headers.h:8,
>         >                          from packetforwardrohc.c:9:
>         >         /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:197:
>         warning:
>         >         ‘struct ip_packet’ declared inside parameter list
>         >         /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:197:
>         warning: its
>         >         scope is only this definition or declaration, which
>         is
>         >         probably not what you want
>         >         /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:205:
>         warning:
>         >         ‘struct ip_packet’ declared inside parameter list
>         >         /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:210:
>         warning:
>         >         ‘struct ip_packet’ declared inside parameter list
>         >         /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:279:
>         warning:
>         >         ‘struct ip_packet’ declared inside parameter list
>         >         /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:280:
>         warning:
>         >         ‘struct ip_packet’ declared inside parameter list
>         >         /home/josie/rohc-1.2.0/src/comp/rohc_comp.h:290:
>         warning:
>         >         ‘struct ip_packet’ declared inside parameter list
>         >         In file included from packetforwardrohc.c:9:
>         >         headers.h:14:1: warning: "ETHER_ADDR_LEN" redefined
>         >         In file included from /usr/include/libnet.h:57,
>         >                          from packetforwardrohc.c:8:
>         >         /usr/include/net/ethernet.h:52:1: warning: this is
>         the
>         >         location of the previous definition
>         >         packetforwardrohc.c: In function ‘got_packet’:
>         >         packetforwardrohc.c:494: warning: passing argument 2
>         of
>         >         ‘rohc_compress’ discards qualifiers from pointer
>         target type
>         >
>           /usr/lib/gcc/i486-linux-gnu/4.2.4/../../../../lib/crt1.o: In
>         >         function `_start':
>         >         (.text+0x18): undefined reference to `main'
>         >         /tmp/cc2r5eZ0.o: In function `got_packet':
>         >         packetforwardrohc.c:(.text+0xd38): undefined
>         reference to
>         >         `rohc_compress'
>         >         /tmp/cc2r5eZ0.o: In function `main.5994':
>         >         packetforwardrohc.c:(.text+0xe08): undefined
>         reference to
>         >         `crc_get_polynom'
>         >         packetforwardrohc.c:(.text+0xe16): undefined
>         reference to
>         >         `crc_table_3'
>         >         packetforwardrohc.c:(.text+0xe1b): undefined
>         reference to
>         >         `crc_init_table'
>         >         packetforwardrohc.c:(.text+0xe27): undefined
>         reference to
>         >         `crc_get_polynom'
>         >         packetforwardrohc.c:(.text+0xe35): undefined
>         reference to
>         >         `crc_table_7'
>         >         packetforwardrohc.c:(.text+0xe3a): undefined
>         reference to
>         >         `crc_init_table'
>         >         packetforwardrohc.c:(.text+0xe46): undefined
>         reference to
>         >         `crc_get_polynom'
>         >         packetforwardrohc.c:(.text+0xe54): undefined
>         reference to
>         >         `crc_table_8'
>         >         packetforwardrohc.c:(.text+0xe59): undefined
>         reference to
>         >         `crc_init_table'
>         >         packetforwardrohc.c:(.text+0xe7d): undefined
>         reference to
>         >         `rohc_alloc_compressor'
>         >         packetforwardrohc.c:(.text+0xffa): undefined
>         reference to
>         >         `rohc_activate_profile'
>         >         packetforwardrohc.c:(.text+0x1010): undefined
>         reference to
>         >         `rohc_activate_profile'
>         >         packetforwardrohc.c:(.text+0x1026): undefined
>         reference to
>         >         `rohc_activate_profile'
>         >         packetforwardrohc.c:(.text+0x103c): undefined
>         reference to
>         >         `rohc_activate_profile'
>         >         packetforwardrohc.c:(.text+0x1052): undefined
>         reference to
>         >         `rohc_activate_profile'
>         >         packetforwardrohc.c:(.text+0x121f): undefined
>         reference to
>         >         `rohc_alloc_compressor'
>         >         packetforwardrohc.c:(.text+0x13a1): undefined
>         reference to
>         >         `rohc_free_compressor'
>         >         collect2: ld returned 1 exit status
>         >
>         >
>         >         Could you tell me what I might be doing wrong?
>         Attached is the
>         >         sample code.
>         >
>         >         Would really appreciate your feedback, thanks.
>         >
>         >         Regards,
>         >         Josephine
>         >
>         >
>         >
>         >
>         >
>         >
>         
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