@PETER96

It states in the README that:

This Release has been tested with the following:
- Red Hat Advanced Server 6.0 Update 2 Release 64-bit with GCC 4.4.4 (RHEL_6_64_GCC444) 
- Oracle Linux Server 6.0 Update 4 64-bit with UPA Lib GCC 4.4.4 (RHEL6_64_GCC444) 
- Oracle Linux Server 7.0 64-bit with GCC 4.8.2 (OL7_64_GCC482) 
- CentOS 7.0 64-bit with GCC 4.8.2 (OL7_64_GCC482) 

For CentOS 7.x with GCC 4.8.5, the application should link to librssl.a from OL7_64_GCC482. Therefore, the correct location for librssl.a is /home/pan/Elektron-SDK1.2.1.linux.rrg/Cpp-C/Eta/Libs/OL7_64_GCC482/Debug/librssl.a.

I change link then

||=== Build: Debug in fmarketrueter (compiler: GNU GCC Compiler) ===| /usr/bin/ld: /home/pan/Elektron-SDK1.2.1.linux.rrg/Cpp-C/Eta/Libs/OL7_64_GCC482/Debug/librssl.a(rsslImpl.c.o)||undefined reference to symbol 'dlclose@@GLIBC_2.2.5'| ||=== Build failed: 1 error(s), 0 warning(s) (0 minute(s), 11 second(s)) ===|

Have you added -ldl in the linker options? It requires -lnsl -lpthread -lrt -ldl -lm.

If this doesn't solve the problem, please share your Makefile.

You may need to verify the version of glibc installed on the machine.

# yum list glibc
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: anorien.csc.warwick.ac.uk
 * extras: centos.mirroring.pulsant.co.uk
 * updates: centos.mirrors.nublue.co.uk
Installed Packages
glibc.i686                           2.17-222.el7                          @base
glibc.x86_64                         2.17-222.el7                          @base

If the application is built properly, it will link to /lib64/libdl.so.2.

# ldd CENTOS7_64_GCC482/Debug/Consumer
        linux-vdso.so.1 =>  (0x00007ffd5c146000)
        libnsl.so.1 => /lib64/libnsl.so.1 (0x00007fbe0a4fe000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fbe0a2e2000)
        librt.so.1 => /lib64/librt.so.1 (0x00007fbe0a0da000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00007fbe09ed6000)
        libm.so.6 => /lib64/libm.so.6 (0x00007fbe09bd4000)
        libc.so.6 => /lib64/libc.so.6 (0x00007fbe09807000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fbe0a718000)

/lib64/libdl.so.2 will have dlopen@@GLIBC_2.2.5.

# strings /lib64/libdl.so.2 | grep dlopen
dlopen
dlopen.c
dlopen_doit
dlopenold.c
__dlopen_check
__dlopen
dlopen@@GLIBC_2.2.5

I check version below

glibc.x86_64 2.17-157.el7 Available Packages glibc.i686 2.17-222.el7 glibc.x86_64 2.17-222.el7

dlopen dlopen.c dlopen_doit dlopenold.c __dlopen_check __dlopen dlopen@@GLIBC_2.2.5

My linker option -lpthread -lema -lxml2 -lrssl -lrsslVA -ldl -lnsl -lrt -ldl -lm

but

/home/pan/Elektron-SDK1.2.1.linux.rrg/Cpp-C/Eta/Libs/OL7_64_GCC482/Debug/librsslVA.a(rsslReactor.c.o)||In function `_reactorTakeChannel':| /local/jenkins/workspace/ESDKCore/OS/OL7-64/esdk/Cpp-C/Eta/Impl/Reactor/rsslReactor.c|176|未定義參考到「rsslCreateNotifierEvent」|

From my test, the order of Elektron library in the link options is matter. The -lrsslVA must be before -lrssl.

 -lpthread -lema -lxml2 -lrsslVA -lrssl -ldl -lnsl -lrt -ldl -lm

The full commands are:

/usr/bin/g++ -c -m64 -D_REENTRANT -DLinux -O3 -DCOMPILE_64BITS -I/api/setup/Elektron-SDK1.2.1.linux.rrg/Cpp-C/Ema/Src/Include -I/api/setup/Elektron-SDK1.2.1.linux.rrg/Cpp-C/Ema/Src -o CENTOSL7_64_GCC482/Optimized/obj/Consumer.o Consumer.cpp

/usr/bin/g++ -o CENTOSL7_64_GCC482/Optimized/Consumer100 CENTOSL7_64_GCC482/Optimized/obj/Consumer.o -L/api/setup/Elektron-SDK1.2.1.linux.rrg/Cpp-C/Eta/Libs/OL7_64_GCC482/Debug -L/api/setup/Elektron-SDK1.2.1.linux.rrg/Cpp-C/Ema/Libs/OL7_64_GCC482/Debug  -lpthread -lema -lxml2 -lrsslVA -lrssl -ldl -lnsl -lrt -ldl -lm

From my test, the order of Elektron libraries in the link options is matter. -lrsslVA should be before -lrssl.

-lpthread -lema -lxml2 -lrsslVA -lrssl -ldl -lnsl -lrt -ldl -lm

The full commands are:

/usr/bin/g++ -c -m64 -D_REENTRANT -DLinux -O3 -DCOMPILE_64BITS -I/api/setup/Elektron-SDK1.2.1.linux.rrg/Cpp-C/Ema/Src/Include -I/api/setup/Elektron-SDK1.2.1.linux.rrg/Cpp-C/Ema/Src -o CENTOSL7_64_GCC482/Optimized/obj/Consumer.o Consumer.cpp

/usr/bin/g++ -o CENTOSL7_64_GCC482/Optimized/Consumer100 CENTOSL7_64_GCC482/Optimized/obj/Consumer.o -L/api/setup/Elektron-SDK1.2.1.linux.rrg/Cpp-C/Eta/Libs/OL7_64_GCC482/Debug -L/api/setup/Elektron-SDK1.2.1.linux.rrg/Cpp-C/Ema/Libs/OL7_64_GCC482/Debug  -lpthread -lema -lxml2 -lrsslVA -lrssl -ldl -lnsl -lrt -ldl -lm

Thank you for your answer.