Re: [Boost-users] Simple Linking Error

From: jayc.lawrence_at_[hidden]
Date: 2007-11-29 13:20:22

Daniel,

This may be some use to you:

http://svn.boost.org/trac/boost/browser/branches/libs/system

Best,
Jay

Daniel wrote:
> Tried, didn't make any difference.
> $ g++ -v -s -I/usr/include/boost -pthread timer.cpp -o timer 
> -lboost_date_time
> Using built-in specs.
> Target: i486-pc-linux-gnu
> Configured with: /var/tmp/portage/sys-devel/gcc- 
> 4.1.2/work/gcc-4.1.2/configure --prefix=/usr 
> --bindir=/usr/i486-pc-linux-gnu/gcc-bin/4.1.2 
> --includedir=/usr/lib/gcc/i486-pc-linux-gnu/4.1.2/include 
> --datadir=/usr/share/gcc-data/i486-pc-linux-gnu/4.1.2 
> --mandir=/usr/share/gcc-data/i486-pc-linux-gnu/4.1.2/man 
> --infodir=/usr/share/gcc-data/i486-pc-linux-gnu/4.1.2/info 
> --with-gxx-include-dir=/usr/lib/gcc/i486-pc-linux-gnu/4.1.2/include/g++-v4 
> --host=i486-pc-linux-gnu --build=i486-pc-linux-gnu --disable-altivec 
> --enable-nls --without-included-gettext --with-system-zlib 
> --disable-checking --disable-werror --enable-secureplt 
> --disable-libunwind-exceptions --disable-multilib --enable-libmudflap 
> --disable-libssp --disable-libgcj --with-arch=i486 
> --enable-languages=c,c++,fortran --enable-shared --enable-threads=posix 
> --enable-__cxa_atexit --enable -clocale=gnu
> Thread model: posix
> gcc version 4.1.2 (Gentoo 4.1.2 p1.0.2)
>  /usr/libexec/gcc/i486-pc-linux-gnu/4.1.2/cc1plus -quiet -v 
> -I/usr/include/boost -D_GNU_SOURCE -D_REENTRANT timer.cpp -quiet 
> -dumpbase timer.cpp -march=i486 -auxbase timer -version -o /tmp/ccMTaEv0.s
> ignoring nonexistent directory 
> "/usr/lib/gcc/i486-pc-linux-gnu/4.1.2/../../../../i486-pc-linux-gnu/include"
> #include "..." search starts here:
> #include <...> search starts here:
>  /usr/include/boost
>  /usr/lib/gcc/i486-pc-linux-gnu/4.1.2/include/g++-v4
>  /usr/lib/gcc/i486-pc-linux-gnu/4.1.2/include/g++-v4/i486-pc-linux-gnu
>  /usr/lib/gcc/i486-pc-linux-gnu/4.1.2/include/g++-v4/backward
>  /usr/local/include
>  /usr/lib/gcc/i486-pc-linux-gnu/4.1.2/include
>  /usr/include
> End of search list.
> GNU C++ version 4.1.2 (Gentoo 4.1.2 p1.0.2) (i486-pc-linux-gnu)
>         compiled by GNU C version 4.1.2 (Gentoo 4.1.2 p1.0.2).
> GGC heuristics: --param ggc-min-expand=46 --param ggc-min-heapsize=30755
> Compiler executable checksum: 4ca4b00b3bea7fbbb8f68a78703ea1b5
>  /usr/lib/gcc/i486-pc-linux-gnu/4.1.2/../../../../i486-pc-linux-gnu/bin/as 
> -V -Qy -o /tmp/ccHiGaC0.o /tmp/ccMTaEv0.s
> GNU assembler version 2.16.1 (i486-pc-linux-gnu) using BFD version 2.16.1
>  /usr/libexec/gcc/i486-pc-linux-gnu/4.1.2/collect2 --eh-frame-hdr -m 
> elf_i386 -dynamic-linker /lib/ld-linux.so.2 -o timer -s 
> /usr/lib/gcc/i486-pc-linux-gnu/4.1.2/../../../crt1.o 
> /usr/lib/gcc/i486-pc-linux-gnu/4.1.2/../../../crti.o 
> /usr/lib/gcc/i486-pc-linux-gnu/4.1.2/crtbegin.o 
> -L/usr/lib/gcc/i486-pc-linux-gnu/4.1.2 
> -L/usr/lib/gcc/i486-pc-linux-gnu/4.1.2 
> -L/usr/lib/gcc/i486-pc-linux-gnu/4.1.2/../../../../i486-pc-linux-gnu/lib 
> -L/usr/lib/gcc/i486-pc-linux-gnu/4.1.2/../../.. /tmp/ccHiGaC0.o 
> -lboost_date_time -lstdc++ -lm -lgcc_s -lgcc -lpthread -lc -lgcc_s -lgcc 
> /usr/lib/gcc/i486-pc-linux-gnu/4.1.2/crtend.o 
> /usr/lib/gcc/i486-pc-linux-gnu/4.1.2/../../../crtn.o
> /tmp/ccHiGaC0.o: In function 
> `__static_initialization_and_destruction_0(int, int)':
> timer.cpp:(.text+0x13b): undefined reference to 
> `boost::system::get_system_category()'
> timer.cpp:(.text+0x145): undefined reference to 
> `boost::system::get_posix_category()'
> timer.cpp:(.text+0x14f): undefined reference to 
> `boost::system::get_posix_category()'
> timer.cpp:(.text+0x159): undefined reference to 
> `boost::system::get_system_category()'
> collect2: ld returned 1 exit status
> 
> On Nov 29, 2007 1:01 PM, Andrew Holden <aholden_at_[hidden] 
> <mailto:aholden_at_[hidden]>> wrote:
> 
>     Daniel [daniel.cubetek_at_[hidden] <mailto:daniel.cubetek_at_[hidden]>]
>     wrote:
>      > Here's the output:
>      > $  g++ -v -s -I/usr/include/boost -lboost_date_time -pthread
>     ./timer.cpp -o ./timer
> 
>     I notice you're putting the library name at the beginning of the command
>     line.  Because of the way g++ parses command lines, it will not actually
>     link in the library.  It goes from left to right and only links in
>     library components that it already knows it needs.  -lboost_date_time is
>     the first source mentioned, and the linker sees no need to bother with
>     it, because it hasn't yet seen anything that needs it.
> 
>     It is best to put libraries at the end of the command line, and you may
>     need to play with their order if one library depends on another.
> 
>     Try this:
> 
>     g++ -v -s -I/usr/include/boost -pthread timer.cpp -o timer
>     -lboost_date_time
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