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[Josephine Kakande <jnkakande@xxxxxxxxx>]

Hi Yasser,

Thanks for the update.


> 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
>
>
There is still an error, and I notice it is because the .o file is not
created in the first step:


This in the new 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:50:
/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:50:
headers.h:14:1: warning: "ETHER_ADDR_LEN" redefined
In file included from /usr/include/libnet.h:57,
                 from packetforwardrohc.c:49:
/usr/include/net/ethernet.h:52:1: warning: this is the location of the
previous definition
packetforwardrohc.c: In function ‘got_packet’:
packetforwardrohc.c:535: 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

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

gcc: packetforwardrohc.o: No such file or directory

Any suggestions?

Thanks a lot,
Josephine


>
> 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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> >
> >
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>
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