RE: Compiling helloWorld of EPICS V4 on 64bit linux had a link error [SEC=UNOFFICIAL]

[<david.hickin@diamond.ac.uk>]

Hi Qingru,

 

Thanks for your emails.

I look after the two examples in exampleCPP.

 

Both examples, HelloWorld and ChannelArchiverService, currently link against expat. In fact HelloWorld doesn't need to.

 

So the quickest solution is to remove the line

 

USR_SYS_LIBS += expat

 

from HelloWorld/helloWorldApp/Makefile.

 

I'll make that change to the mercurial repo and it'll be in the next release.

 

However it sounds like you've got it to build by installing expat-devel. That'll still be useful if you try to build the ChannelArchiverService.

 

Dave

 

From: 米清茹 [mailto:miqingru@sinap.ac.cn]
Sent: 13 June 2014 07:00
To: LYNCH, Damien; Jani Hakala; Hinko Kocevar; tech-talk@aps.anl.gov
Subject: 答复: Compiling helloWorld of EPICS V4 on 64bit linux had a link error [SEC=UNOFFICIAL]

 

Hi Lynch, Jani, Hinko,

You are right! The expat-devel package hasn't installed. After I installed the expat-devel package with yum, libexpat.so was also installed into /usr/lib64.

Thank you very much!


Qingru Mi

---

发件人: LYNCH, Damien [dly@ansto.gov.au]
发送时间: 2014年6月12日 14:00
到: 米清茹; tech-talk@aps.anl.gov
主题: RE: Compiling helloWorld of EPICS V4 on 64bit linux had a link error [SEC=UNOFFICIAL]

Hi Qingru,

 

Glad to hear it’s working. I suspect the real problem is the expat-devel package is not installed.

 

Damien

 

From: 米清茹 [mailto:miqingru@sinap.ac.cn]
Sent: Thursday, 12 June 2014 3:32 PM
To: LYNCH, Damien; tech-talk@aps.anl.gov
Subject: 答复: Compiling helloWorld of EPICS V4 on 64bit linux had a link error [SEC=UNOFFICIAL]

 

Hi Lynch,
    There wasn't libexpat.so. After I created the link, the HelloWorld was built without any error.
    Thank you very much!

Qingru Mi
   

---

发件人: LYNCH, Damien [dly@ansto.gov.au]
发送时间: 2014年6月12日 11:59
到: 米清茹; tech-talk@aps.anl.gov
主题: RE: Compiling helloWorld of EPICS V4 on 64bit linux had a link error [SEC=UNOFFICIAL]

Although you don’t mention libexpat.so. Does that exist?  If not you could create it as a link to libexpat.so.1.

 

From: LYNCH, Damien
Sent: Thursday, 12 June 2014 1:52 PM
To: LYNCH, Damien; ???; tech-talk@aps.anl.gov
Subject: RE: Compiling helloWorld of EPICS V4 on 64bit linux had a link error [SEC=UNOFFICIAL]

 

Sorry, ignore that I missed I can find libexpat.so.1 and libexpat.so.1.5.2 in /lib64 in your message.

 

From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of LYNCH, Damien
Sent: Thursday, 12 June 2014 1:50 PM
To: ???; tech-talk@aps.anl.gov
Subject: RE: Compiling helloWorld of EPICS V4 on 64bit linux had a link error [SEC=UNOFFICIAL]

 

Hi,

 

I assume expat is the Expat XML parser library. Do you have that installed?

 

Damien

 

From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of ???
Sent: Thursday, 12 June 2014 1:29 PM
To: tech-talk@aps.anl.gov
Subject: Compiling helloWorld of EPICS V4 on 64bit linux had a link error

 

Hi,

    I compiled the EPICS-CPP-4.3.0 on 64bit centos6.5. As the HelloWorld in exampleCPP was compiled, an error occured. The error information shows below:

/usr/bin/g++ -o HelloService  -L/BLC/epics/v4/EPICS-CPP-4.3.0/pvAccessCPP/lib/linux-x86_64 -L/BLC/epics/v4/EPICS-CPP-4.3.0/pvDataCPP/lib/linux-x86_64 -Wl,-rpath,/BLC/epics/v4/EPICS-CPP-4.3.0/pvAccessCPP/lib/linux-x86_64 -Wl,-rpath,/BLC/epics/v4/EPICS-CPP-4.3.0/pvDataCPP/lib/linux-x86_64       -m64               HelloServiceMain.o HelloService.o    -lpvAccess -lpvData  -lexpat
/usr/bin/ld: cannot find -lexpat
collect2: ld returned 1 exit status
make[2]: *** [HelloService] Error 1
make[2]: Leaving directory `/BLC/epics/v4/EPICS-CPP-4.3.0/exampleCPP/HelloWorld/helloWorldApp/O.linux-x86_64'
make[1]: *** [install.linux-x86_64] Error 2
make[1]: Leaving directory `/BLC/epics/v4/EPICS-CPP-4.3.0/exampleCPP/HelloWorld/helloWorldApp'
make: *** [helloWorldApp.install] Error 2

I can find libexpat.so.1 and libexpat.so.1.5.2 in /lib64.

How to resolve the problem?


Qingru Mi
SSRF

 

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