Re: [gentoo-user] Re: Firefox and clang

[Jack <ostroffjh@users.sourceforge.net>]

I sent my previous reply before seeing this, and I have still not  
received Marco's message, which explains thing better then I did.

On 2024.11.01 13:50, Michael wrote:
> On Friday 1 November 2024 17:00:20 GMT Marco Rebhan wrote:
> > On Friday, 1 November 2024 17:41:25 CET Michael wrote:
> > > Without USE="clang" the emerge takes 12-18% longer, but I am not  
> sure what
> > > is the recommended compiler for FF or why it was changed.
> >
> > Hi Michael,
> >
> > https://bugs.gentoo.org/941878 seems to be the relevant bug with  
> discussion
> > on why it was changed.
> 
> Thanks!  From what I read briefly, I understand clang is recommended  
> upstream
> and therefore was set as a default flag.  However, a rust Vs rust-bin  
> version
> clash can occur and since FF patched their code to work with gcc,  
> setting
> clang as the default compiler is no longer considered necessary - at  
> least
> this is the present status.
> 
> I don't know what the runtime performance impact may be of the  
> current clang
> Vs gcc[1], but compilation times were longer on my systems, loosely  
> comparing
> FF versions 128.3.1 to 128.4.0.
> 
> [1]  
> https://stackoverflow.com/questions/3187414/clang-vs-gcc-which-produces-faster-binaries
> 
> 
> > > PS. Also I do not understand the meaning of these notations:
> > >
> > > IUSE="foo"
> >
> > Everything outside the quotes is normal bash syntax, the variable  
> contents
> > are interpreted by Portage.
> >
> > This sets the ebuild to have USE flags "foo". (If IUSE was set  
> before this
> > line, it will clear out all the USE flags that were defined before.)
> >
> > > IUSE="+foo"
> >
> > This sets the ebuild to have USE flags "foo", the preceding "+" on  
> the USE
> > flag means it is enabled by default.
> >
> > > IUSE+="foo"
> >
> > This appends to the previous IUSE value. Equivalent to  
> IUSE="${IUSE}foo"
> > (note the missing space, hence why the Firefox ebuild uses IUSE+="  
> foo"
> > instead).
> >
> > Cheers,
> > Marco
> 
> Thanks for this clear and succinct explanation!  :-)
>