C/C++

C/C++

C/C++

Your one-stop destination to learn and collaborate about the latest innovations in IBM C/C++ for z/OS compilers to develop high-performing C/C++ applications and system programs on z/OS while maximizing hardware use and improving application performance.

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  • 1.  Documentation

    Posted 03/23/23 09:23 AM

    Struggling to find the documentation on how to setup XL C/C++ under Unix System Services.

    I am trying to install an npm package which keeps failing with 
    EDC5129I No such file or directory. (errno2=0x05940252)FSUM3221 xlc++: Cannot spawn program /usr/lpp/cbclib/xlc/exe/ccndrvr - EDC5142I Invalid seek. (errno2=0x054D0057).

    The troubleshooting section refers me to the XL C/C++ doco which doesn't include an install guide so you would even know what to check for.  I eventually found some documentation but it only covers the z/OS SMP/E setup and nothing to do with how to invoke it or set it up in USS.



    ------------------------------
    Jonathan Juler
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  • 2.  RE: Documentation

    Posted 03/24/23 04:09 AM

    SMP/E is the only way you can install any product on z/OS (well, until IBM switches everything to z/OSMF, but that's another story).  Your system programmer has to do it for you.  You cannot install software by yourself, not least because you likely do not have the privileges needed to install (most of us do not).

    Installing anything on z/OS is a privilege granted to few.



    ------------------------------
    Peter Farley
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  • 3.  RE: Documentation

    Posted 03/26/23 06:37 PM

    Thanks Peter.  Yeah...no issue with who does the install or how - but the install docs help understand the steps taken to setup the environment.  Let's just say our environment is not always setup as per the docs but without them you don't know what you don't know eh?



    ------------------------------
    Jonathan Juler
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    Original Message


  • 4.  RE: Documentation

    Posted 03/24/23 04:22 AM

    I googled it and found

    I copied /usr/lpp/cbclib/xlc/etc/xlc.cfg to my current working directory:

    cp /usr/lpp/cbclib/xlc/etc/xlc.cfg myxlc.cfg

    I modified the value of the steplib option in myxlc.cfg from none to
    CBC.SCCNCMP.

    Thereafter the command

    xlc -F./xlc.cfg -o hw hw.c

    worked

    Make sure it points to your library

    Colin



    ------------------------------
    Colin Paice
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  • 5.  RE: Documentation

    Posted 03/26/23 06:33 PM

    Hi Colin,

    Thanks for the reply - I worked out eventually what I needed to do.  I have indeed already cracked that nut, my issue was npm was not using my xlc.cfg file to work out where to get stuff.  There is no option to tell npm to use a local xlc.cfg file but it does honour whatever you setup for normal C compiles.  The system version of xlg.cfg is not configured properly (methinks no-one uses it or due to low confidence takes matters in their own hands like I am).  I have some environment variables set like CFLAGS='-F xlc.cfg' and CXXFLAGS='-F xlc.cfg' which has helped with other attempts at C compilation but not this.  Turns out there is another option called XL_CONFIG that I had to set for npm to work out that I wanted to use the local version then bingo we had an attempted compile.

    Then I had to work out why it couldn't include the headers...again there are options in the xlc.cfg but I am no expert at this so it took me a while to work out which ones to use (cinc and cppinc).  None of this is helped by the inconsistency in the naming standards for variables and parameters nor by the sprinkling of different bits of information throughout different manuals.

    I finally got it to the point where it would at least attempt to compile the code and could now find the header files but now have a roadblock in the form of :
    npm ERR! "../cppsrc/zrexx.cc", line 187.1: CCN5130 (S) "Napi::RegisterModule" is not declared.

    The road goes ever on and down down from the door where it began...

    Regards J



    ------------------------------
    Jonathan Juler
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    Original Message


  • 6.  RE: Documentation

    Posted 03/27/23 10:17 AM
    Edited by Linda Chui 03/27/23 03:42 PM

    hi,

    All the documentation for that, including XL_CONFIG and how to set up the config file is in the z/OS XL C/C++ Users Guide in Chapter 25 (Compiler invocation using a customizable configuration file). A web link to the starting topic here: https://www.ibm.com/docs/en/zos/2.5.0?topic=guide-xlc-compiler-invocation-using-customizable-configuration-file

    Hope this helps.



    ------------------------------
    Linda Chui
    Compilation Technology & Enterprise Products
    IBM Canada
    ------------------------------

    Original Message


  • 7.  RE: Documentation

    Posted 03/27/23 06:46 PM

    Thanks Linda.  I have managed to work out everything I needed to know thus far but it is good to have it documented here.


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