[zeromq-dev] Problems building zmq

Arnaud Loonstra arnaud at sphaero.org
Wed Nov 20 17:54:40 CET 2019


If I issue

pkg-config --libs libczmq

I get

-L/usr/local/lib -lczmq

So I guess you should do

gcc zmqserver.c -o zmqserver -lczmq -L.

instead of libcmzq. This is on Debian but I guess Ubuntu is the same.

Rg,

Arnaud


On 20-11-2019 17:23, Bill Engelke wrote:
> Hello all:
> 
> I would like to work with zmq in C, and I have hit problems trying to 
> compile and link the server/client example here 
> <https://zeromq.org/get-started/?language=c> and trying to build any of 
> the zguide examples here 
> <https://github.com/booksbyus/zguide/tree/master/examples/C>.
> 
> Platform: Ubuntu (tried all of this using first the ARM libraries on an 
> Odroid, then the x86_64 libraries on a PC running Ubuntu); same results
> 
> I used sudo-apt-get install libczmq-dev   (this is the only package I 
> can find available for Ubuntu)
> 
> sudo ldconfig
> 
> I have verified that the shared library is present in 
> /usr/lib/x86_64-linux-gnu/     (libczmq, that is libczmq.so)
> 
> When I use this:
> 
> gcc zmqserver.c -o zmqserver -llibczmq -L.
> 
> I get:
> 
> /usr/bin/ld: cannot find -llibczmq
> 
> collect2: error: ld returned 1 exit status
> 
> I have tried referencing the library directly:
> 
> /usr/bin/ld: cannot find -l:/usr/lib/x86_64-linux-gnu/libczmq
> 
> collect2: error: ld returned 1 exit status
> 
> I have tried every possible combination of the order of the link 
> references I can come up with, all with the same result.
> 
> Running using the verbose flag, we get:
> 
> gcc zmqserver.c -o zmqserver -llibczmq -L. -v
> 
> Using built-in specs.
> 
> COLLECT_GCC=gcc
> 
> COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
> 
> OFFLOAD_TARGET_NAMES=nvptx-none
> 
> OFFLOAD_TARGET_DEFAULT=1
> 
> Target: x86_64-linux-gnu
> 
> Configured with: ../src/configure -v --with-pkgversion='Ubuntu 
> 7.4.0-1ubuntu1~18.04.1' 
> --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs 
> --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ 
> --prefix=/usr --with-gcc-major-version-only --program-suffix=-7 
> --program-prefix=x86_64-linux-gnu- --enable-shared 
> --enable-linker-build-id --libexecdir=/usr/lib 
> --without-included-gettext --enable-threads=posix --libdir=/usr/lib 
> --enable-nls --with-sysroot=/ --enable-clocale=gnu 
> --enable-libstdcxx-debug --enable-libstdcxx-time=yes 
> --with-default-libstdcxx-abi=new --enable-gnu-unique-object 
> --disable-vtable-verify --enable-libmpx --enable-plugin 
> --enable-default-pie --with-system-zlib --with-target-system-zlib 
> --enable-objc-gc=auto --enable-multiarch --disable-werror 
> --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 
> --enable-multilib --with-tune=generic 
> --enable-offload-targets=nvptx-none --without-cuda-driver 
> --enable-checking=release --build=x86_64-linux-gnu 
> --host=x86_64-linux-gnu --target=x86_64-linux-gnu
> 
> Thread model: posix
> 
> gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
> 
> COLLECT_GCC_OPTIONS='-o' 'zmqserver' '-L.' '-v' '-mtune=generic' 
> '-march=x86-64'
> 
> /usr/lib/gcc/x86_64-linux-gnu/7/cc1 -quiet -v -imultiarch 
> x86_64-linux-gnu zmqserver.c -quiet -dumpbase zmqserver.c -mtune=generic 
> -march=x86-64 -auxbase zmqserver -version -fstack-protector-strong 
> -Wformat -Wformat-security -o /tmp/cc2R1v53.s
> 
> GNU C11 (Ubuntu 7.4.0-1ubuntu1~18.04.1) version 7.4.0 (x86_64-linux-gnu)
> 
>                  compiled by GNU C version 7.4.0, GMP version 6.1.2, 
> MPFR version 4.0.1, MPC version 1.1.0, isl version isl-0.19-GMP
> 
> GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
> 
> ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
> 
> ignoring nonexistent directory 
> "/usr/lib/gcc/x86_64-linux-gnu/7/../../../../x86_64-linux-gnu/include"
> 
> #include "..." search starts here:
> 
> #include <...> search starts here:
> 
> /usr/lib/gcc/x86_64-linux-gnu/7/include
> 
> /usr/local/include
> 
> /usr/lib/gcc/x86_64-linux-gnu/7/include-fixed
> 
> /usr/include/x86_64-linux-gnu
> 
> /usr/include
> 
> End of search list.
> 
> GNU C11 (Ubuntu 7.4.0-1ubuntu1~18.04.1) version 7.4.0 (x86_64-linux-gnu)
> 
>                  compiled by GNU C version 7.4.0, GMP version 6.1.2, 
> MPFR version 4.0.1, MPC version 1.1.0, isl version isl-0.19-GMP
> 
> GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
> 
> Compiler executable checksum: fa57db1fe2d756b22d454aa8428fd3bd
> 
> COLLECT_GCC_OPTIONS='-o' 'zmqserver' '-L.' '-v' '-mtune=generic' 
> '-march=x86-64'
> 
> as -v --64 -o /tmp/ccKlQGoW.o /tmp/cc2R1v53.s
> 
> GNU assembler version 2.30 (x86_64-linux-gnu) using BFD version (GNU 
> Binutils for Ubuntu) 2.30
> 
> COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/7/:/usr/lib/gcc/x86_64-linux-gnu/7/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/7/:/usr/lib/gcc/x86_64-linux-gnu/
> 
> LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/7/:/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/7/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/7/../../../:/lib/:/usr/lib/
> 
> COLLECT_GCC_OPTIONS='-o' 'zmqserver' '-L.' '-v' '-mtune=generic' 
> '-march=x86-64'
> 
> /usr/lib/gcc/x86_64-linux-gnu/7/collect2 -plugin 
> /usr/lib/gcc/x86_64-linux-gnu/7/liblto_plugin.so 
> -plugin-opt=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper 
> -plugin-opt=-fresolution=/tmp/ccOSG0IO.res 
> -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s 
> -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc 
> -plugin-opt=-pass-through=-lgcc_s --sysroot=/ --build-id --eh-frame-hdr 
> -m elf_x86_64 --hash-style=gnu --as-needed -dynamic-linker 
> /lib64/ld-linux-x86-64.so.2 -pie -z now -z relro -o zmqserver 
> /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/Scrt1.o 
> /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/crti.o 
> /usr/lib/gcc/x86_64-linux-gnu/7/crtbeginS.o -L. 
> -L/usr/lib/gcc/x86_64-linux-gnu/7 
> -L/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu 
> -L/usr/lib/gcc/x86_64-linux-gnu/7/../../../../lib 
> -L/lib/x86_64-linux-gnu -L/lib/../lib -L/usr/lib/x86_64-linux-gnu 
> -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/7/../../.. 
> /tmp/ccKlQGoW.o -llibczmq -lgcc --push-state --as-needed -lgcc_s 
> --pop-state -lc -lgcc --push-state --as-needed -lgcc_s --pop-state 
> /usr/lib/gcc/x86_64-linux-gnu/7/crtendS.o 
> /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/crtn.o
> 
> /usr/bin/ld: cannot find -llibczmq
> 
> collect2: error: ld returned 1 exit status
> 
> Trying to build the zguide examples shows that something is missing or 
> misconfigured for that as well: (using library cloned from 
> https://github.com/booksbyus/zguide)
> 
> ./build hwserver
> 
> hwserver
> 
> /usr/bin/ld: cannot find -luuid
> 
> collect2: error: ld returned 1 exit status
> 
> I have looked thru online discussion groups to the point of exhaustion; 
> some possible ideas here 
> <https://stackoverflow.com/questions/19406024/c-linker-cannot-find-lcrypto-but-the-library-is-in-the-path> 
> and here 
> <https://stackoverflow.com/questions/335928/ld-cannot-find-an-existing-library>, 
> but still no luck.
> 
> What am I missing?     -B.E.
> 
> 
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> 



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