Experimental Physics and
Industrial Control System

"Ernest L. Williams Jr." <[email protected]> · Fri, 14 Oct 2005 14:48:13 -0400

On Fri, 2005-10-14 at 14:29 -0400, Zhijian Yin (ZY) wrote:
> Hi, Ernest,
> 
> Just like you, I am trying to compile epics for a AMD64 linux box.  I am 
> running Debian.
> 
> Compiling epics base stalls, because  
> $(EPICS)/base/startup/EpicsHostArch.pl(and EpicsHostArch shell script) 
> reports amd64 as "unsupported".
> 
> I found a quick and dirty fix is to add x86_64 to the cpu list for 
> x86-linux, i.e., change EpicsHostArch script to
> 
> case $sysname in
>     Linux )
>         os=linux
>                 cpu=`uname -m`
>         case $cpu in i386 | i486 | i586 | i686 | x86_64 )          ### 
> added x86_64
>             cpu=x86
> 
> And change the related lines in EpicsHostArch.pl to
> 
> sub GetEpicsHostArch { # no args
>     $arch=$Config{'archname'};
>     if ($arch =~ /sun4-solaris/)       { return "solaris-sparc";
>     } elsif ($arch =~ m/i86pc-solaris/) { return "solaris-x86";
>     } elsif ($arch =~ m/sun4-sunos/)    { return "sun4-68k";
>     } elsif ($arch =~ m/i[3-6]86-linux/)    { return "linux-x86";
>     } elsif ($arch =~ m/x86_64/)    { return 
> "linux-x86";                   ####this is a newly added line
>     } elsif ($arch =~ m/MSWin32-x86/)   { return "win32-x86";
>     } elsif ($arch =~ m/cygwin/)        { return "cygwin-x86";
>     } elsif ($arch =~ m/PA-RISC1.1/)    { return "hpux-parisc";
>     } elsif ($arch =~ m/darwin/)        { return "darwin-ppc";
>     } else { return "unsupported"; }
> }
> 
> 
> The idea is to have 'uname -m' (which reports as x86_64 for AMD64) as 
> linux-x86 for epics. 

I did not have to do the above.  My RedHat AMD64 machine just reports
the correct architecture with uname of course.

When I source 
/ade/epics/supTop/base/R3.14.7/startup/EpicsHostArch
every thing is set properly.

EPICS_HOST_ARCH=linux-x86_64

The next step was add configuration files in the
<EPICS_BASE>/configure/os area.
> 
> Recompilation works fine.  Since it uses x86_64 libs, the build is 64bit.

Compilation worked very well and was extremely fast, however, it is not
64-bit.  When the compilation is complete what you get is a 32-bit
application running on a 64-bit OS.  So basically, when we run EPICS it
the linux OS is in 32-bit compatibility mode.

To achieve the 64-bit mode we will have to throw the "-m64" flag to the
GCC compiler.

This is my next step but I sense there will be trouble as some of my
colleagues have forewarned me.

> 
> A better way probably is as what you suggested, add x86_64 as a seperate 
> architecture.  I think you can just copy the linux-x86 files.
Yes, copy them and rename them.  I also had to make a few modifications
inside some of the files.  For example, 
change ARCH_DEP_CPPFLAGS += -D_X86_
to ARCH_DEP_CPPFLAGS += -D_X86_64_

> 
> 
> ZY
> 
> 
> Ernest L. Williams Jr. wrote:
> 
> >Hi,
> >
> >I have an AMD64 linux box running redhat linux and want to build both a
> >32-bit and 64-bit version of EPICS BASE.
> >
> >Before we get started, I wanted to check the community for EPICS running
> >on AMD64 natively.  Is anyone doing this?
> >
> >I would like to start with just building EPICS R3.14 natively against an
> >ADM64 Opteron architecture.  Not interested in cross-compiling yet (i.e.
> >let's forget about vxWorks for now).
> >
> >Of course, we will need new configuration files in
> >"<EPICS_BASE/configure/os>"
> >
> >I supposed they would look like so:
> >================================================
> >CONFIG.Common.linux-x86_64
> >CONFIG.Common.linux-x86_64-debug
> >CONFIG.linux-x86_64.Common
> >CONFIG.linux-x86_64-debug.Common
> >CONFIG.linux-x86_64-debug.linux-x86_64-debug
> >CONFIG.linux-x86_64.linux-x86_64
> >CONFIG.linux-x86_64.linux-x86_64-debug
> >CONFIG_SITE.Common.linux-x86_64
> >CONFIG_SITE.linux-x86_64.Common
> >CONFIG_SITE.linux-x86_64-debug.linux-x86_64-debug
> >CONFIG_SITE.linux-x86_64.linux-x86_64
> >CONFIG_SITE.linux-x86_64.UnixCommon
> >=================================================
> >
> >Thanks,
> >Ernest L. Williams Jr.
> >SNS Control Systems Group
> >ORNL
> >
> >
> >
> >  
> >
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System