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#1 (**permalink**) 02-21-2008, 04:51 AM

Hi.

When emerging sth we can enable or disable USE flags by writing
USE="usethis -andnotthis" emerge app
can it be done with CXX flags?
Of course I can write CXXFLAGS="very long cxxflags which I dont want to
write every time" emerge
but is there possibility to write something like CXXFLAGS="- -fno-rtti"
emerge
?

#2 (**permalink**) 02-21-2008, 04:51 AM

* Marek Defeciñski (2003-07-10 16:04 +0200)
> When emerging sth we can enable or disable USE flags by writing
> USE="usethis -andnotthis" emerge app
> can it be done with CXX flags?
> Of course I can write CXXFLAGS="very long cxxflags which I dont want to
> write every time" emerge
> but is there possibility to write something like CXXFLAGS="- -fno-rtti"
> emerge
> ?

C/CXXFLAGS are not incremental as USE and other flags are, so there is
no need for "disabling".

Thorsten
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#3 (**permalink**) 02-21-2008, 04:52 AM

Marek Defeciñski smie twierdzic jakoby:

> When emerging sth we can enable or disable USE flags by writing
> USE="usethis -andnotthis" emerge app
> can it be done with CXX flags?
> Of course I can write CXXFLAGS="very long cxxflags which I dont want to
> write every time" emerge
> but is there possibility to write something like CXXFLAGS="- -fno-rtti"
> emerge
> ?

no. but there is a simple way to do this. first make `cat
/etc/make.conf |grep FLAG`, then copy only those ones, which you need
and export them as enviroment variable (`export CFLAGS='new flags...`
and the same with CXXFLAGS). after emerging simply unset them (`unset
CFLAGS; unset CXXFLAGS) to make settings from make.conf file enabled again.

this trick works becouse emerge check first env. variables and after it,
but only in case that no C*FLAGS are sets it check /etc/make.conf file

pozdr. Aye

--
"Life's a bitch and so am I, the world owes me, so fuck you." - Green Day
PoLiSh YoUr EnGlIsH:
SZKLO POSZLO - GLASGOW

#4 (**permalink**) 02-21-2008, 04:52 AM

* Aye <crytcheck@NOSPAM-normanet.pl> wrote on 11/Jul/2003 - 12:55:13 :
> Marek Defeciñski smie twierdzic jakoby:
>
>> When emerging sth we can enable or disable USE flags by writing
>> USE="usethis -andnotthis" emerge app
>> can it be done with CXX flags?
>> Of course I can write CXXFLAGS="very long cxxflags which I dont want to
>> write every time" emerge
>> but is there possibility to write something like CXXFLAGS="- -fno-rtti"
>> emerge
>> ?
>
> no. but there is a simple way to do this. first make `cat
> /etc/make.conf |grep FLAG`, then copy only those ones, which you need
> and export them as enviroment variable (`export CFLAGS='new flags...`
> and the same with CXXFLAGS). after emerging simply unset them (`unset
> CFLAGS; unset CXXFLAGS) to make settings from make.conf file enabled again.
>
> this trick works becouse emerge check first env. variables and after it,
> but only in case that no C*FLAGS are sets it check /etc/make.conf file
>
> pozdr. Aye

Hi all,

another trick is to look in the ebuild file - normally you find there
CFLAGS and/or CXXFLAGS which can be edited ... otherwise you could try to
add them following examples from other ebuild files ;-)

Suxs
Stefan

#5 (**permalink**) 02-21-2008, 04:53 AM

On Thu, 10 Jul 2003 16:04:35 +0200, Marek Defeciñski wrote:

> Hi.
>
> When emerging sth we can enable or disable USE flags by writing
> USE="usethis -andnotthis" emerge app
> can it be done with CXX flags?
AFAIK and understood you right, YES.
#man gcc
e.g.
-msse or -mnosse

> Of course I can write CXXFLAGS="very long cxxflags which I dont want to
> write every time" emerge

> but is there possibility to write something like CXXFLAGS="- -fno-rtti"
> emerge
> ?
Why should you that? you put it in make.conf e.g. I have
'-fomit-frame-pointer' in CFLAGS and do not have it in CXXFLAGS.

regards
PiotrAF
P.

#6 (**permalink**) 02-21-2008, 04:53 AM

PiotrAF wrote:

> On Thu, 10 Jul 2003 16:04:35 +0200, Marek Defeciñski wrote:
>
>> ?
> Why should you that? you put it in make.conf e.g. I have
> '-fomit-frame-pointer' in CFLAGS and do not have it in CXXFLAGS.

I have -fomint-frame-pointer -fno-rtti -fno-exceptions in make.conf
everything compiled fine except for _one_ package.
So when I emerged this package compiler refused to compile as
no-rtti was set, hten I must
vi /etc/make.conf
find the line with no-rttti, delete it
emerge one package,
vi /etc/make.conf
add the line with no-rttti,
emerge the rest

It would be nice to avoid editing everytime make.conf
and be able to specify it in command line
CXXFLAGS="disable flag"

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enabling/disabling C(XX)FLAGS