[zeromq-dev] Problems building zmq

Bill Engelke engelke77 at bellsouth.net
Wed Nov 20 17:23:14 CET 2019 

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-b
ut-the-library-is-in-the-path>  and here
<https://stackoverflow.com/questions/335928/ld-cannot-find-an-existing-libra
ry> , but still no luck.

 

What am I missing?     -B.E.

 

 

 

 

 

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