Re: [Boost-users] Simple Linking Error

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 mailto:aholden@charteroaksystems.com> wrote:

Daniel [daniel.cubetek@gmail.com mailto:daniel.cubetek@gmail.com] 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 _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org mailto:Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users http://lists.boost.org/mailman/listinfo.cgi/boost-users

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