should backport OpenMP 3.0 to gcc-4.3.1 for Intrepid

[Qichang Liang]

Binary package hint: gcc-4.3

gcc implementation of the new openmp-3.0 standard has been merged into the svn trunk in June

http://gcc.gnu.org/

openmp-3.0 contains quite a number of new features and redhat has already backported openmp-3.0 to 4.3.1. To make openmp-3.0 into Intrepid, which would help many multi-core machines, should we also backport openmpi-3.0 to gcc-4.3.1 in Intrepid? Can we just lift Redhat's diff into our one?

http://download.fedora.redhat.com/pub/fedora/linux/development/source/SRPMS//gcc-4.3.1-5.src.rpm

[Matthias Klose (doko)]

Leung, Kai-Cheung schrieb:
> Public bug reported:
>
> Binary package hint: gcc-4.3
>
> gcc implementation of the new openmp-3.0 standard has been merged into
> the svn trunk in June
>
> http://gcc.gnu.org/
>
> openmp-3.0 contains quite a number of new features and redhat has
> already backported openmp-3.0 to 4.3.1. To make openmp-3.0 into
> Intrepid, which would help many multi-core machines, should we also
> backport openmpi-3.0 to gcc-4.3.1 in Intrepid? Can we just lift Redhat's
> diff into our one?

No, the diff contains more than the openmp backport.

[Qichang Liang (kcleung-users)]

Quoting Matthias Klose <email address hidden>:

> Leung, Kai-Cheung schrieb:
> > Public bug reported:
> >
> > Binary package hint: gcc-4.3
> >
> > gcc implementation of the new openmp-3.0 standard has been merged
> into
> > the svn trunk in June
> >
> > http://gcc.gnu.org/
> >
> > openmp-3.0 contains quite a number of new features and redhat has
> > already backported openmp-3.0 to 4.3.1. To make openmp-3.0 into
> > Intrepid, which would help many multi-core machines, should we also
> > backport openmpi-3.0 to gcc-4.3.1 in Intrepid? Can we just lift
> Redhat's
> > diff into our one?
>
> No, the diff contains more than the openmp backport.
>
> --
> should backport OpenMP 3.0 to gcc-4.3.1 for Intrepid
> https://bugs.launchpad.net/bugs/253185
> You received this bug notification because you are a direct subscriber
> of the bug.
>

However how easy / difficult if we merge openmp-3.0 into ubuntu intrepid
gcc-4.3.1 without using redhat diff?

[Matthias Klose (doko)]

Leung, Kai-Cheung schrieb:
> However how easy / difficult if we merge openmp-3.0 into ubuntu intrepid
> gcc-4.3.1 without using redhat diff?

yoe, not me ;) I didn't look how difficult it is, but given our feature freeze
date approaching, you have to be quick. As an alternative, us the gcc-snapshot
package for experimental work.

  Matthias

[Qichang Liang (kcleung-users)]

Hi,

I am now trying to navigate the gcc sourcecode. Is the openmp-3.0 stuff
built into gfortran, gcc and g++, outside the libgomp subdirectory?

So when I try to merge openmp stuff into gcc-4.3.1 source file, which part
of the current gcc svn should I look at? I am a bit lost........
Obviously the the current trunk is 4.4 and I shouldn't merge everything at
the trunk to our gcc-4.3 source.....

Alternatively, I can use gcc-snapshot. By definition, it is a snapshot of
the trunk (future 4.4). Am I correct? If I use this snapshot and compile
my own programs, then if my programs links to other libraries (standard
libraries as well as some specific libraries), do I have to recompile ALL
these libraries using gcc-snapshot as well? This is my initial motivation
for thinking about backporting openmp 3.0 to gcc-4.3.1

Kai-Cheung

Quoting Matthias Klose <email address hidden>:

> Leung, Kai-Cheung schrieb:
> > However how easy / difficult if we merge openmp-3.0 into ubuntu
> intrepid
> > gcc-4.3.1 without using redhat diff?
>
> yoe, not me ;) I didn't look how difficult it is, but given our
> feature freeze
> date approaching, you have to be quick. As an alternative, us the
> gcc-snapshot
> package for experimental work.
>
> Matthias
>
> --
> should backport OpenMP 3.0 to gcc-4.3.1 for Intrepid
> https://bugs.launchpad.net/bugs/253185
> You received this bug notification because you are a direct subscriber
> of the bug.
>

[Matthias Klose (doko)]

you only have to use the snapshot for the parts using OpenMP 3.0. Make sure that you do use the shared libs from gcc-snapshot as well.

[Matthias Klose (doko)]

tempted to close this one as won't fix.

[Matthias Klose (doko)]

closing as won't fix. please see the gcc-snapshot package (20081024-0ubuntu1) for openmp-3.0.