Re: GCC plugin for avr-gcc

Hi Jeremy !

Thanks a lot for your reply ! Please see my reply inline.

On Thu, Jul 24, 2014 at 3:35 AM, Jeremy Bennett
<[email protected]> wrote:
> On 24/07/14 03:38, Sandeep K Chaudhary wrote:
>> Hi Guys,
>>
>> I wish to implement a GCC plugin that can work with avr-gcc. I came to
>> realize that the latest avr-gcc or avr-g++ is based off GCC 4.8.2.
>> However, the whole GCC plugin APIs were introduced in 4.9.0.
>> Therefore, the 'fplugin' option is not present with the latest
>> avr-gcc.
>
> Hi Shadeep,
>
> That doesn't seem right to me. I think the plugin mechanism his already
> there. For example the MAGEEC plugin (www.mageec.org) works with both
> 4.8 and 4.9 AVR GCC.
>
> It is possible that official distributions are compiled with it
> disabled. What does gcc -v report?

Here is the output of "gcc -v" :

sandeep@ubuntu:~/ispec$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
4.8.2-19ubuntu1'
--with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.8 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--enable-gnu-unique-object --disable-libmudflap --enable-plugin
--with-system-zlib --disable-browser-plugin --enable-java-awt=gtk
--enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre
--enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64
--with-arch-directory=amd64
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)


"--enable-shared" is configured here. Is this what you meant? Please
let me know.

>
> However...
>
> While the interface for initializing a plugin is well defined, plugins
> inherently use internal APIs and these are not stable. In the MAGEEC
> plugin you'll see a lot of #ifdefs with the GCC minor version numbers.
>
> If you are doing this sort of work, I suggest you just use mainline GCC.
> Then you can be sure you are using the latest version.
>
>> Can someone please tell me when we can expect to have the plugin
>> support in avr-gcc? Also, is there some way to get around this problem
>> i.e. somehow being able to use the plugin option with current avr-gcc?
>>
>> It would be a great help if I can get the plugin option to work with avr-gcc.
>
> I believe it is working. Have a look at the code for MAGEEC to see how
> we use it. It's on GitHub:
>
>   https://github.com/mageec/mageec
>
> (I demonstrated this at the GNU Tools Cauldron last weekend. The talk
> and video should be up in a couple of weeks).

Yes, I am looking at this code. In case of questions, will get back to you.

>
> Best wishes,
>
>
> Jeremy
>
> --
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>
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-- 
Thanks and regards,
Sandeep K Chaudhary.