[gentoo-dev] new ebuild variables proposal...

[gentoo-dev] new ebuild variables proposal...

[Zach Forrest]

I've been working on an ebuild recently and the package won't compile 
with the '-funroll-loops' compiler flag. It might be nice to have a 
couple of variables such as 'BAD_CFLAGS' and 'BAD_CXXFLAGS' that would 
tell portage to remove these compiler flags for a particular ebuild. 
This would provide a uniform way to deal with any similar problems 
without someone having to modify their optimization settings for one ebuild.

Any thoughts?

Zach

Re: [gentoo-dev] new ebuild variables proposal...

[George Shapovalov]

This is in fact possible and does not require new flag introguction. Just
define you CFLAGS in src_compile and pass them to make. You can easily to
redefine or add something to C[XX]Flags. If you want to only remove some
specific flags you will need to do some bash magic (though I am sure such
utils exist already, if not its a few lines of python code).
In the last case you indeed may want some automation on the side of
portage scripts. For details on how to do such CFLAGS modifications
just grep for CFLAGS under /usr/portage and read files which match.

If you want this to be seriously considered by core developers (since
this is a modification to portage) this is what you will need to do (from
my experience):
write more detailed proposal (not very long though) and spend some time on
motivations - why this is necessary. Then submit this onto bugs.gentoo.org
as a feature request (put it under: gentoo/portage/enhancement).


George


On Fri, 5 Apr 2002, Zach Forrest wrote:

> I've been working on an ebuild recently and the package won't compile
> with the '-funroll-loops' compiler flag. It might be nice to have a
> couple of variables such as 'BAD_CFLAGS' and 'BAD_CXXFLAGS' that would
> tell portage to remove these compiler flags for a particular ebuild.
> This would provide a uniform way to deal with any similar problems
> without someone having to modify their optimization settings for one ebuild.
>
> Any thoughts?
>
> Zach
>
> _______________________________________________
> gentoo-dev mailing list
> gentoo-dev@gentoo.org
> http://lists.gentoo.org/mailman/listinfo/gentoo-dev
>

Re: [gentoo-dev] new ebuild variables proposal...

[Spider]

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try something like :
	CFLAGS=`echo CFLAGS | sed s:-funroll-loops::g`
//Spider

begin  quote
On Fri, 05 Apr 2002 09:04:37 -0800
Zach Forrest <zach@disinformation.ca> wrote:

> I've been working on an ebuild recently and the package won't compile 
> with the '-funroll-loops' compiler flag. It might be nice to have a 
> couple of variables such as 'BAD_CFLAGS' and 'BAD_CXXFLAGS' that would
> tell portage to remove these compiler flags for a particular ebuild. 
> This would provide a uniform way to deal with any similar problems 
> without someone having to modify their optimization settings for one
> ebuild.
> 
> Any thoughts?
> 
> Zach
> 
> _______________________________________________
> gentoo-dev mailing list
> gentoo-dev@gentoo.org
> http://lists.gentoo.org/mailman/listinfo/gentoo-dev


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Re: [gentoo-dev] new ebuild variables proposal...

[Bart Verwilst]

Hi

Easiest and best way to do it IMHO:

CFLAGS=${CFLAGS/-funroll-loops}

See ya!

On Friday 05 April 2002 20:58, Spider wrote:
|| try something like :
|| 	CFLAGS=`echo CFLAGS | sed s:-funroll-loops::g`
|| //Spider
||
|| begin  quote
|| On Fri, 05 Apr 2002 09:04:37 -0800
||
|| Zach Forrest <zach@disinformation.ca> wrote:
|| > I've been working on an ebuild recently and the package won't compile
|| > with the '-funroll-loops' compiler flag. It might be nice to have a
|| > couple of variables such as 'BAD_CFLAGS' and 'BAD_CXXFLAGS' that would
|| > tell portage to remove these compiler flags for a particular ebuild.
|| > This would provide a uniform way to deal with any similar problems
|| > without someone having to modify their optimization settings for one
|| > ebuild.
|| >
|| > Any thoughts?
|| >
|| > Zach
|| >
|| > _______________________________________________
|| > gentoo-dev mailing list
|| > gentoo-dev@gentoo.org
|| > http://lists.gentoo.org/mailman/listinfo/gentoo-dev

-- 
Bart Verwilst
Gentoo Linux Developer, Desktop Team
Gent, Belgium

Re: [gentoo-dev] new ebuild variables proposal...

[Spider]

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you win! : )



> Easiest and best way to do it IMHO:
> CFLAGS=${CFLAGS/-funroll-loops}
> || 	CFLAGS=`echo CFLAGS | sed s:-funroll-loops::g`

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Re: [gentoo-dev] new ebuild variables proposal...

[Jared H. Hudson]

Most ebuilds for packages that are picky about optimization settings, set 
their own CFLAGS & CXXFLAGS. If you will post what package you tried to 
compile and could not due to a CFLAGS setting, it would help us.

For example, if you look at the glibc ebuild you will find that CFLAGS is 
set to -O2 instead of the possible default of -O3, because linuxthreads 
which is part of glibc won't compile with -O3 apparently.

Personally, I feel this is the right way to handle this. Otherwise, just
having a BAD_CFLAGS variable takes away optimizations from programs which 
might have a problem with 1 but not all optimization flags.

-Jared H.

On Fri, 5 Apr 2002, Zach Forrest wrote:

> I've been working on an ebuild recently and the package won't compile 
> with the '-funroll-loops' compiler flag. It might be nice to have a 
> couple of variables such as 'BAD_CFLAGS' and 'BAD_CXXFLAGS' that would 
> tell portage to remove these compiler flags for a particular ebuild. 
> This would provide a uniform way to deal with any similar problems 
> without someone having to modify their optimization settings for one ebuild.
> 
> Any thoughts?
> 
> Zach
> 
> _______________________________________________
> gentoo-dev mailing list
> gentoo-dev@gentoo.org
> http://lists.gentoo.org/mailman/listinfo/gentoo-dev
> 

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