On 25/03/11 21:48, Diane Holt wrote:
I hope you don't mind me sending you mail, but I'm a bit stuck...I've
been told I need the Linaro 4.5.2 toolchain because it has some "neon
optimizations" that the CS 4.5.1 doesn't have.
In general, you'd be better addressing these questions on the Linaro
Toolchain mailing list: linaro-toolchain@lists.linaro.org (I've copied
it in).
Not least because I'm on vacation for the next week. :)
> Unfortunately, the Linaro
4.5.2 that's available for download (already built) won't work in my
Scratchbox environment, since it was compiled against a glibc that's too
new. The CS 4.5.1 works fine -- but I'm not allowed to use it, because
of the neon stuff.
The CS and Linaro compilers are really very similar, but CodeSourcery
has not made a release since the autumn, so Linaro will have some extra
features.
Do you know whether CS actually does have (or will have) the same neon
optimizations Linaro has?
It depends which optimizations you are referring to? The existing CS
release had the latest improvements at the time it was released, and I
believe that the upcoming release will probably be very similar to
Linaro (at least, with respect to ARMv7 - there'll be many differences
for other architecture variants), but I'm not promising that.
Sorry if that's a bit vague, but I the contents of the next CS release
is still not finalised.
If it doesn't (and won't), then I'm going to have to build the Linaro
one from source. Unfortunately, I've not been able to find any detailed
information on how to go about doing that. Do you know if that's
documented anywhere?
Are you talking about building native compiler, or a cross-compiler? The
former is very simple (provided you have all the dependencies), while
the latter is more involved.
Here's the recipe to build a native compiler:
tar xf gcc-linaro.....tar.bz2
mkdir objdir
cd objdir
../gcc-linaro....../configure --prefix=<your-install-path> <opts>
make bootstrap
make install
You can copy the configure <opts> from another compiler using 'gcc -v'
and './configure --help' in the source tree should tell you what they mean.
If you want to build a cross compiler, I suggest you look at crosstool
or crosstool-ng, or OpenEmbedded. Building cross-toolchains is non-trivial.
Hope that helps.
Andrew
_______________________________________________
linaro-toolchain mailing list
linaro-toolchain@lists.linaro.org
http://lists.linaro.org/mailman/listinfo/linaro-toolchain
