Bingo ! Following the way of Alain, I found the missing link. libleghist.so must also be linked, and then it compilled with no errors. Thanks to all for the tips, The tip from Aalin is a great Helpfull Hint Greetings Ronny > -----Original Message----- > From: Grumelart, Alain [SMTP:agrumela@xxxxxxxxxx] > Sent: Wednesday, November 20, 2002 7:32 PM > To: 'foxboro@xxxxxxxxxxxxx' > Subject: Re: [foxboro] data retrieval with legacy historian > > > Ronny > > I find that if I can't rely on the documentation to determine which > libraries > have to be included on the cc commnad line (as sometimes happens), > I can track them down with a combination of the nm and grep commands. > > nm reports the symbols that are defined and/or referenced in a library > file. > > Let's say for instance that, when you build your application, the linker > reports > that rq_msgs is undefined. > > To search for the dynamic library that defines this function > type the following command sequence from a bourne shell script: > > cd /usr/lib > for f in lib*.so > do echo $f > nm $f | grep rq_msgs > done > > You will see output similar to this: > > libhistory.so > [664] | 137064| 440|FUNC |GLOB |0 |7 |rq_msgs > [397] | 0| 0|FILE |LOCL |0 |ABS |rq_msgs50.c > > It tells you that rq_msgs in defined in libhistory.so. > Therefore you have to add -lhistory to you compilation command to resolve > that undefined symbol. > > If you see the word UNDEF in the second to last field then that library > contains code that calls the function but the fucntion is defined in > another library file. So you have to keep looking until you find the > library file where the fucntion IS defined. > > This is why you often have to put more than one -lxxx references > in your compiler command. > Libraries are built by calling functions from other libraries. > > BTW: -lxxx on the compiler command line is short-hand notation > for libxxx.so or libxxx.a. > The linker will look for the library file in /usr/lib and in any > other directory specified by the -L flags. > > Another usefull trick is to use the ldd command. > If you want to compile for instance an application that retrieves > legacy historian data and you know about an existing program or utility > that does the same thing, you can use ldd to find out what libraries > the program loads at run-time and where it expects to find them. > Then you know your program will have to be linked also with at least > some of these libraries. > > > Hope this helps. > > Alain Grumelart Ing. > Systems Integration & IT > Invensys Process Systems > Foxboro Canada Inc. > > > > > -----Original Message----- > From: De Maeyer Ronny [mailto:Ronny.DeMaeyer@xxxxxxxxxx] > Sent: Monday, November 18, 2002 2:51 AM > To: foxboro@xxxxxxxxxxxxx > Subject: [foxboro] data retrieval with legacy historian > > > > Hi, > > I am trying to compile a program to retrieve data from the legacy > historian. > Following the documentation (BO 193BL rev.e section 8) I use the following > syntax > > cc testhist.c -L/opt/fox/hstorian/bin -I/usr/include/fox -lhist -lisam > -lfox > -lPW > > I get the following errors > > ld: fatal: library -lisam : not found > ld: fatal: library -lPW: not found > > We use the c compiler from SUN, and the legacy historian on ver. 4.3 > In witch library could these files be ? > I have searched the AW but could not find anything like isam.lib or PW.lib > > Has anyone any sugestion ? > > > Thanks in advace, > Ronny > > > Ronny De Maeyer > > > > Fluxys n.v. > > LNG TERMINAL ZEEBRUGGE > > H.V. Wolvensstraat 3, Kaai 615 > > B - 8380 ZEEBRUGGE > > Tel.: (++32) (0)50 36 66 24 (direct) > > Tel.: (++32) (0)50 36 66 11 (central) > > > > mailto:ronny.demaeyer@xxxxxxxxxx > > http://www.fluxys.net > > > > > > > > > ************************************************************************** > This e-mail and any attachments thereto may contain information which is > confidential and/or protected by intellectual property rights and are > intended for the sole use of the recipient(s) named above.Any use of the > information contained herein (including, but not limited to, total or > partial reproduction, communication or distribution in any form) by > persons > other than the designated recipient(s) is prohibited.Any liability for the > correct and complete transmission of the information or for any delay or > interruption of the transmission or for damages arising from the use of > reliance of the information shall be disclaimed.If you have received this > e-mail in error, please notify the sender either by telephone or by e-mail > and delete the material from any computer. > Thank you for your cooperation > ************************************************************************** > > > > _______________________________________________________________________ > This mailing list is neither sponsored nor endorsed by Invensys Process > Systems (formerly The Foxboro Company). 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Thank you for your cooperation ************************************************************************** _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: http://www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave