Issue linking to static boost thread library (Newbie)
I am having a little trouble getting boost to load the static thread library. For some reason it wants to load the dynamic library instead of the static boost_thread library. Everything compiles and builds, but I get a message that it can't find the shared library, when I really want it linked statically. (see below) What did I miss? Thanks much for any help, Graham Boost version: 1.33.1 OS: Linux 2.6 Compiler: GCC 4.1.1 Compiler command line (debug): g++ -I/home/quirk/dev/libraries/boost_1_33_1/ -O0 -g3 -Wall -c -fmessage-length=0 -pthread -MMD -MP -MF"main.d" -MT"main.d" -o"main.o" "../main.cpp" Linker command line (debug): g++ -L/home/quirk/dev/libraries/boost_1_33_1/stage/lib -o"ManagedMakeProject" ./main.o -lpthread -lboost_thread-gcc-mt-d-1_33_1 Code: #include <cstdio> #include "boost/thread/thread.hpp" void foo() { printf("Hello MT World\n"); } int main(int argc, char* argv[]) { printf("Hello World\n"); boost::thread aThread(foo); aThread.join(); return 0; } Output: error while loading shared libraries: libboost_thread-gcc-mt-d-1_33_1.so.1.33.1: cannot open shared object file: No such file or directory ____________________________________________________________________________________ Have a burning question? Go to www.Answers.yahoo.com and get answers from real people who know.
Thanks for the reply. When I change the linker line to this (added the .a extension): g++ -L/home/fejimush/development/libraries/boost_1_33_1/stage/lib -o"ManagedMakeProject" ./main.o -lboost_thread-gcc-mt-d-1_33_1.a I get the follow error: /usr/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../i686-pc-linux-gnu/bin/ld: cannot find -lboost_thread-gcc-mt-d-1_33_1.a The file is there and everything seems to be spelled correctly, path and filename. I am coming from the ms windows world and used to the IDE pretty much doing the makefiles and compiler/linker arguments for you. It's probably something trivial. Thanks again, Graham --- Roland Schwarz <roland.schwarz@chello.at> wrote:
I am having a little trouble getting boost to load
Forever Kid schrieb: the
static thread library.
Hint: Did you try to link in the .a file?
Roland _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org
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Forever Kid escribió:
Thanks for the reply.
When I change the linker line to this (added the .a extension): g++ -L/home/fejimush/development/libraries/boost_1_33_1/stage/lib -o"ManagedMakeProject" ./main.o -lboost_thread-gcc-mt-d-1_33_1.a
I get the follow error: /usr/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../i686-pc-linux-gnu/bin/ld: cannot find -lboost_thread-gcc-mt-d-1_33_1.a
The file is there and everything seems to be spelled correctly, path and filename.
If you want that the linker doesn't search the library, you dont have to use the -l flag. Try linking with this: g++ \ -o"ManagedMakeProject" ./main.o \ /home/fejimush/development/libraries/boost_1_33_1/stage/lib/libboost_thread-gcc-mt-d-1_33_1.a (Assuming that the file libboost_thread-gcc-mt-d-1_33_1.a is in the directory /home/fejimush/development/libraries/boost_1_33_1/stage/lib) The -l flag searches first for the dinamic (.so) library, and only if it can't find it, it searches for the static version. But, returning to your first post, I think that your problem doesn't happens at build time, does it? When do you get the message "error while loading shared libraries"? At link time or at run time? If you are sure that the file /home/quirk/dev/libraries/boost_1_33_1/stage/lib/libboost_thread-gcc-mt-d-1_33_1.so exists and that the problem is at run time, then try this: g++ -L/home/quirk/dev/libraries/boost_1_33_1/stage/lib \ -o"ManagedMakeProject" ./main.o -lpthread \ -lboost_thread-gcc-mt-d-1_33_1 \ -Wl,-rpath,/home/quirk/dev/libraries/boost_1_33_1/stage/lib Regards, Raul.
Thanks Raul, Nat, and Roland, I appreciate the help. I finally found my way here: http://gcc.gnu.org/onlinedocs/gcc-4.1.1/gcc/Link-Options.html#Link-Options It seems these are key for static linking: -static -static-libgcc I am not used to the gcc compiler and it seems like it does dynamic linking by default. Is that correct? I thought that -l specified static linking (it seems I was wrong) ...and are currently using these options for compiling and linking: Compile: g++ -I/home/quirk/dev/lib/boost_1_33_1/ -O0 -g3 -Wall -c -fmessage-length=0 -pthread -MMD -MP -MF"main.d" -MT"main.d" -o"main.o" "../main.cpp" Finished building: ../main.cpp Link: g++ -L/home/quirk/dev/lib/boost_1_33_1/stage/lib -static -static-libgcc -o"ManagedMakeProject" ./main.o -lboost_thread-gcc-mt-d-1_33_1 -lpthread --- Raúl Huertas <raulh39@ya.com> wrote:
Forever Kid escribió:
Thanks for the reply.
When I change the linker line to this (added the .a extension): g++
-L/home/fejimush/development/libraries/boost_1_33_1/stage/lib
-o"ManagedMakeProject" ./main.o -lboost_thread-gcc-mt-d-1_33_1.a
I get the follow error:
/usr/lib/gcc/i686-pc-linux-gnu/4.1.1/../../../../i686-pc-linux-gnu/bin/ld:
cannot find -lboost_thread-gcc-mt-d-1_33_1.a
The file is there and everything seems to be spelled correctly, path and filename.
If you want that the linker doesn't search the library, you dont have to use the -l flag. Try linking with this:
g++ \ -o"ManagedMakeProject" ./main.o \
/home/fejimush/development/libraries/boost_1_33_1/stage/lib/libboost_thread-gcc-mt-d-1_33_1.a
(Assuming that the file libboost_thread-gcc-mt-d-1_33_1.a is in the directory
/home/fejimush/development/libraries/boost_1_33_1/stage/lib)
The -l flag searches first for the dinamic (.so) library, and only if it can't find it, it searches for the static version.
But, returning to your first post, I think that your problem doesn't happens at build time, does it? When do you get the message "error while loading shared libraries"? At link time or at run time?
If you are sure that the file
/home/quirk/dev/libraries/boost_1_33_1/stage/lib/libboost_thread-gcc-mt-d-1_33_1.so
exists and that the problem is at run time, then try this:
g++ -L/home/quirk/dev/libraries/boost_1_33_1/stage/lib \ -o"ManagedMakeProject" ./main.o -lpthread \ -lboost_thread-gcc-mt-d-1_33_1 \
-Wl,-rpath,/home/quirk/dev/libraries/boost_1_33_1/stage/lib
Regards, Raul.
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participants (2)
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Forever Kid -
Raúl Huertas -
Roland Schwarz