Re: ld & my Makefile

[Mohsen Pahlevanzadeh <mohsen at pahlevanzadeh dot org>]

I used g++ instead gcc -x c++. When i use -llibstdc++ at the end of link
line , i receive following lines:
////////////////////////////////////////////////////////////////////
g++ -o urldump  urldump.o base64.o buf.o pcaputil.o chksum_ctl.o
postgres.o linked_list.o   -lresolv -lnsl -lrpcsvc  -lpcap -lnet -lnids
-L. -lpq -lpthread -llibstdc++  
postgres.o:(.data+0x0): multiple definition of `conninfo'
urldump.o:/home/mohsen/workspace/urldump/./urldump.c:309: first defined
here
/usr/bin/ld: cannot find -llibstdc++
collect2: ld returned 1 exit status
make: *** [urldump] Error 1

////////////////////////////////////////////////////////////////////////


And when i remove -llibstdc++ from the end of link line , i receive
following lines:

//////////////////////////////////////////////////////////////////////////////
urldump.o: In function `flushing(void*)':
urldump.c:(.text+0xce): undefined reference to `flush_to_db(int)'
urldump.o: In function `process_http_request(tuple4*, unsigned char*,
int)':
urldump.c:(.text+0x359): undefined reference to `buf_init(buf*, unsigned
char*, int)'
urldump.c:(.text+0x378): undefined reference to `buf_tok(buf*, void*,
int)'
urldump.c:(.text+0x3a7): undefined reference to `buf_seek(buf*, int,
int)'
urldump.c:(.text+0x4f0): undefined reference to `base64_pton(char
const*, unsigned char*, unsigned int)'
urldump.c:(.text+0x5fe): undefined reference to `buf_tok(buf*, void*,
int)'
urldump.c:(.text+0x653): undefined reference to
`libnet_host_lookup(unsigned long, unsigned short)'
urldump.c:(.text+0x693): undefined reference to
`libnet_host_lookup(unsigned long, unsigned short)'
urldump.c:(.text+0x6b1): undefined reference to
`libnet_host_lookup(unsigned long, unsigned short)'
urldump.c:(.text+0x6d1): undefined reference to `filling_node(char*,
char*, char*, char*, char*)'
urldump.c:(.text+0x6ec): undefined reference to `buf_index(buf*, void*,
int)'
urldump.o: In function `main':
urldump.c:(.text+0x8d9): undefined reference to `strconcat(char*, ...)'
urldump.c:(.text+0x8e3): undefined reference to `pg_connect()'
urldump.c:(.text+0xa15): undefined reference to `copy_argv(char**)'
collect2: ld returned 1 exit status
make: *** [urldump] Error 1
///////////////////////////////////////////////////////////////////

What's happen?
On Tue, 2009-10-13 at 14:25 -0700, Ian Lance Taylor wrote:
> Mohsen Pahlevanzadeh <mohsen@pahlevanzadeh.org> writes:
> 
> > On Tue, 2009-10-13 at 08:05 -0700, Ian Lance Taylor wrote:
> >> Mohsen Pahlevanzadeh <mohsen@pahlevanzadeh.org> writes:
> >> 
> >> > I wrote a program in C, Not C++.It work good.But when i use "-x c++" in
> >> > Makefile, i receive following errors:
> >> 
> >> You have to link with the g++ driver.  Yes, this is confusing.
> >> 
> >> > CC      = gcc
> >> > CFLAGS  =  -g  -Wall  -pthread -DHAVE_NET_ETHERNET_H -DLIBNET_LIL_ENDIAN
> >> > -DDSNIFF_LIBDIR=\"$(libdir)/\" 
> >> > CPP     = -x c++ -llibstcd++
> >> 
> >> If you use this approach, -llibstdc++ must come at the end of the link
> >> line.
> >
> >
> > How do i solve my problem?I must use C++ not C,So i mandatory use g++ or
> > -x c++.
> 
> I recommend that you use "g++" rather than "gcc -x c++".
> 
> Ian
>