Experimental Physics and
Industrial Control System

"Mark Rivers" <[email protected]> · Tue, 2 Jun 2009 07:51:11 -0500

Hi Patrick,

Which architecture you build EPICS base and extensions for is controlled by the environment variable EPICS_HOST_ARCH.  I suspect you built libezca with EPICS_HOST_ARCH=linux-x86.  For 64-bits you need it to be linux-86_64.  

You can tell which version the .so file is with the Linux "file" command:

corvette:extensions_devel/lib/linux-x86>file libezca.so 
libezca.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), not stripped

You can also just look at what directory it is in.  EPICS puts 32-bit .so libraries in lib/linux-x86, while 64-bit libraries are in lib/linux-x86_64.

Mark

________________________________

From: [email protected] on behalf of Patrick Thomas
Sent: Mon 6/1/2009 11:04 PM
To: [email protected]
Subject: ezca libray

Hi,

I'm trying to use the ezca library in a C program, but when I execute it
I get the error:
error while loading shared libraries: libezca.so: wrong elf class:
ELFCLASS32

I guess this means that libezca was compiled as a 32 bit library, while
the program is 64 bit? I thought I had compiled ezca as 64 bit. Is there
some flag I am missing, either when I compile the libezca extensions or
the program itself?

Thank you,
Patrick

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System