[SCIP] linker error when building soplex

[Ziye Tang]

Dear Eddie,

You are absolutely right about the compiler not being configured correctly.
I followed your advice and it worked! Thanks very much for your timely help.

Ziye

On Fri, Jun 12, 2020 at 3:48 PM Edward Lam <ed at ed-lam.com> wrote:

> Hi Ziye,
>
> This error could be due to linking to a wrong version of libstdc++ while
> building Soplex. I get similar problems relating to different versions of
> libstdc++ on Linux, especially with the module system on my Linux computing
> cluster when the admin hasn’t configured the compiler for the right version
> of libstdc++.
>
> If you’re calling Cplex in SCIP (as opposed to calling Soplex in SCIP),
> you should avoid building Soplex altogether.
>
> You can use CMAKE_EXE_LINKER_FLAGS to add flags to linker command. Be
> careful to append your flags not overwrite the existing flags.
>
> Eddie
>
> On 12 Jun 2020, at 5:24 pm, Ziye Tang <ziyet at andrew.cmu.edu> wrote:
>
> Dear Franziska,
>
> Thank you for your reply. However I double checked with cmake
> instructions, it seems the flags are -DCPLEX_INCLUDE_DIRS and
> -DCPLEX_LIBRARY. And I was able to compile successfully using those flags
> on my local PC. Is it possible that the flag you mentioned is for older
> versions?
>
> Anyhow I had no problem during the cmake build process. And the linker
> error (shown in my first email) only pops up during the make process. I
> googled for this error and found a solution (to a similar problem) on
> stackoverflow
> <https://stackoverflow.com/questions/5083047/linker-problem-with-libstdc-so-6-in-connection-with-cuda>,
> which seems a rather straightforward fix: just tell linker where to find
> libstdc++.so explicitly. But I am fairly new to CMake as well as SCIP cmake
> system and I do not know where is the appropriate place to add such a
> linker flag. Do you think the solution is reasonable and if so, could you
> advise where to add the linker flag?
>
> Thanks,
> Ziye
>
> On Thu, Jun 11, 2020 at 4:46 PM Franziska Schloesser <schloesser at zib.de>
> wrote:
>
>> Dear Ziye,
>>
>> To only build scip you can run make in the scip folder that is generated
>> by cmake. For using cplex as LP solver you seem to have used the wrong
>> flags, you need the CPLEX_DIR.
>>
>> That would make your commands look something like this:
>>
>> mkdir build
>> cd build
>> cmake .. -DLPS=cpx -DCPLEX_DIR=</path/to/cplex/install>
>> cd scip
>> make
>>
>> I hope this helps,
>>
>> Best,
>> Franziska
>> On 6/5/20 11:33 AM, Ziye Tang wrote:
>>
>> Dear SCIP team,
>>
>> I am compiling scipoptsuite on a rhel8 server via cmake. I am using cplex
>> as my LP solver and have specified LPS, INCLUDE_DIRS and LIB flags. When
>> cmake finishes, I tried to run make. Here's the error I got:
>>
>> [  3%] Linking CXX executable ../../bin/soplex
>> /usr/bin/ld: CMakeFiles/soplex.dir/soplexmain.cpp.o: undefined reference
>> to symbol '_ZNSo9_M_insertIdEERSoT_@@GLIBCXX_3.4.9'
>> //usr/lib64/libstdc++.so.6: error adding symbols: DSO missing from
>> command line
>> collect2: error: ld returned 1 exit status
>> make[2]: *** [soplex/src/CMakeFiles/soplex.dir/build.make:86: bin/soplex]
>> Error 1
>> make[1]: *** [CMakeFiles/Makefile2:182:
>> soplex/src/CMakeFiles/soplex.dir/all] Error 2
>> make: *** [Makefile:163: all] Error 2
>>
>> I don't understand this linker error. It would be great if someone could
>> point me in the right direction. Also, if I am only using scip (with cplex
>> as LP solver), is there a make target I could build? A while ago I tried
>> make scip but I've got some other errors when using scip.
>>
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