-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Mohsen Pahlevanzadeh wrote: > 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@xxxxxxxxxxxxxxxxx> writes: >> >>> On Tue, 2009-10-13 at 08:05 -0700, Ian Lance Taylor wrote: >>>> Mohsen Pahlevanzadeh <mohsen@xxxxxxxxxxxxxxxxx> 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 Ian is right, though I think your getting confused in how this works a little you might want to try using automake to generate makefiles for your project, so to make sure its done right. - --Phil -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkrV52cACgkQAhcOgIaQQ2FdnACeKEXZvCNgyeptuLNStjasrGYC ynIAn3Vaw7BHlyIdsAfaVGW/qqK7P2lN =vUyS -----END PGP SIGNATURE-----
