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RE: AW: [avr-gcc-list] avr-libc-20020203 patches for c++ support

From: Dean Ferreyra
Subject: RE: AW: [avr-gcc-list] avr-libc-20020203 patches for c++ support
Date: Tue, 9 Apr 2002 11:06:00 -0700


> I program in c++ for pcs and would like to start using it for
> embedded apps
> on the avrs. I have used avrgcc c for some years, first from Gunnar's site
> and lately from Avrfreaks. I have some unix experience and cygwin
> and wincvs
> installed on a win98 system. Could someone list the basic steps and source
> locations necessary to build the c++ version, or perhaps point to
> where this
> is documented? Assume I am starting with an empty system.
> I am sure others would benefit from such a description.

I posted this (below) as a response to someone on the list ages ago.  The
information is sparse, but I hope it gets you started.

I don't know what wincvs is, but if you run into trouble you may want to try
the CVS that comes with cygwin.



> ...
> On the other hand, I thought I would tell you how I get avr-gcc
> up on my machine in case you want to try it.  It ensures that you
> have the lastest binutils and gcc and you'll get a system that
> works with the latest libc.  I have to say, though, that I don't
> know if this is feasible with a slow connection.
> I use Cygwin (http://sources.redhat.com/cygwin/) to provide a
> Unix-like environment on my Windows machine.  It's pretty
> painless since Cygnus provides the binaries.  Then I download the
> latest CVS sources for binutil and gcc and make them.  Here are
> some instructions on using CVS to get binutils sources:
> http://sources.redhat.com/binutils/.  And here are some
> instructions on using CVS to get gcc sources:
> http://gcc.gnu.org/cvs.html.  It can be an involved process, but
> if you're up to it, I think its a good way to get avr-gcc running
> on Windows.  I used to use the snapshots
> (ftp://sourceware.cygnus.com/pub/binutils/snapshots/ and
> ftp://gcc.gnu.org/pub/gcc/snapshots/), but at some point they
> stopped tracking the CVS sources and Marek Michalkiewicz
> suggested CVS and I've never looked back.
> At the end of this, I've included Marek's posted reply to some of
> my questions that got me started with CVS.
> Good luck!
> Dean Ferreyra
> ---------------------------------------------
> From: Marek Michalkiewicz [mailto:address@hidden
> Sent: Saturday, May 06, 2000 3:29 AM
> Cc: AVR List
> Subject: Re: ! synchronize avr-gcc with avr-binutils !
>> I have downloaded and built a recent snapshot of binutils:
>> and started to build a recent snapshot of gcc:
>> ftp://gcc.gnu.org/pub/gcc/snapshots/2000-05-01/egcs-core-20000501.tar.gz
>> The avr-as from this binutils still gives me errors when registers are
>> preceded by an "r".

> It seems binutils snapshots (even 000505 - non-Y2K-compliant) still
> don't have the CVS changes from 1 May.  Strange...  So you have to
> check out the sources using anonymous CVS.  Unfortunately it's a pain
> unless you have fast Internet access, but only the first time (later
> CVS updates usually take no more than a few minutes).
> It is probably a good idea to use current CVS gcc sources too, but
> be careful - they are being broken and fixed all the time :-).
> One good trick when using CVS sources is to build in a separate
> directory (so nothing is written to the CVS tree), like this:
> $ cd egcs
> $ cvs -z9 up
> $ mkdir ../build
> $ cd ../build
> $ ../egcs/configure --enable-languages=c --target=avr # --enable-checking
> $ make
> $ su -c "make install"
> (it is probably safest to rm -rf the build directory each time
> you do a new build - in theory, makefile dependencies should do
> the right thing, but in practice it might fail sometimes).
> The --enable-checking option is for the paranoid only (as of
> yesterday CVS there was internal compiler error in libgcc2.c),
> most people don't use it and live with these bugs...
> The old stable gcc-core-2.95.2-avr-patch-1.1 could be made to
> work with the new binutils by a simple 2-line change in avr.c
> function asm_file_start() - this way you can have 2.95.2 (stable)
> and 2.96 (CVS) installed at the same time, and choose one with
> the avr-gcc -V option (the one installed last is the default).
>> (As an aside, I have been using GNU C for AVR for several weeks now and
>> ecstatic to have such a great development system!  Thanks to everyone who
>> has made this possible!)
> Yes, it is great, but projects like this can never be said to be
> really finished, there is always one more bug or optimization :-).
> One thing still really missing is support for multiple address
> spaces (program and data), so you can access constants in program
> memory directly from C without these ugly macros.  Not easy to
> implement though (needs significant changes in gcc core sources,
> not just in the AVR port), but potentially useful on some other
> targets as well (many DSPs use the Harvard architecture too).
> Marek

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