Re: [Boost-users] Simple Linking Error

From: Daniel (daniel.cubetek_at_[hidden])
Date: 2007-11-29 13:10:59

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]>
wrote:

> Daniel [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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