Experimental Physics and
Industrial Control System

On 8/11/2011 10:06 AM, Jeff Hill wrote:
> I don't know how you can determine what that is. On RHEL I tried "g++ 
> --dumpspecs" but this doesn't appear to reveal any clues.

 From a Debian 6.0 system.  The __i586__ indicates -march=i586

> $ touch empty.c
> $ cpp -dM empty.c | grep 86
> #define __i586 1
> #define __DBL_MAX__ 1.7976931348623157e+308
> #define __i386 1
> #define __i586__ 1
> #define __i386__ 1
> #define i386 1

Note "--target=i486-linux-gnu" is what usually selects this.  Debian 
also gives "--with-arch-32=i586" which overrides this.

> $ gcc -v
> Using built-in specs.
> Target: i486-linux-gnu
> Configured with: ../src/configure -v --with-pkgversion='Debian 
> 4.4.5-8' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs 
> --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr 
> --program-suffix=-4.4 --enable-shared --enable-multiarch 
> --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib 
> --without-included-gettext --enable-threads=posix 
> --with-gxx-include-dir=/usr/include/c++/4.4 --libdir=/usr/lib 
> --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug 
> --enable-objc-gc --enable-targets=all --with-arch-32=i586 
> --with-tune=generic --enable-checking=release --build=i486-linux-gnu 
> --host=i486-linux-gnu --target=i486-linux-gnu
> Thread model: posix
> gcc version 4.4.5 (Debian 4.4.5-8)


I checked a Fedora Core 12 system and it has __i686__

> $ cpp -dM ~/empty.c |grep 86
> #define __i686 1
> #define __DBL_MAX__ 1.7976931348623157e+308
> #define __i686__ 1
> #define __i386 1
> #define __i386__ 1
> #define i386 1

Unfortunately I don't have easy access to older versions or RHEL.


-- 
https://code.launchpad.net/~epics-core/epics-base/epicsR3.15-atomics/+merge/70642
Your team EPICS Core Developers is requested to review the proposed merge of lp:~epics-core/epics-base/epicsR3.15-atomics into lp:epics-base.

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Re: [Merge] lp:~epics-core/epics-base/epicsR3.15-atomics into lp:epics-base Jeff Hill

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