[blfs-dev] GCC5 Tagging Question

Ken Moffat zarniwhoop at ntlworld.com
Fri May 1 16:26:00 PDT 2015

On Fri, May 01, 2015 at 05:26:25PM -0500, Douglas R. Reno wrote:
> Hello all,
> Before I can begin tagging for GCC 5 (and doing the Xorg Updates
> ticket), I have to ask a question. I initially built this system with
> the --with-pic option in Binutils 2.25 in Chapter 6, and therefore I
> have -fPIC and -DPIC enabled by default by the compiler. I plan on
> rebuilding Binutils and GCC without PIC before I begin tagging and
> updating packages on this system. Are there any issues that may arise
> from this?
I'm not aware of any, but everything can be an adventure.  I guess
you'll be updating in place : if it goes bad, backups are your

> On a side note, it appears that my SBU value has increased by an
> additional 20 seconds with GCC 5. Is that odd? (It could be the fact
> that I am watching a movie on  another monitor and I have a text
> editor and Seamonkey open, but I don't think that it should have that
> much of an impact...). I will correct this value before I run through
> the Xorg ticket.
> Thank you, and input is definitely welcome!
Building with newer versions, I expect the SBU to take longer.  I
already noted that my kernel compiles seem to take a little longer
with gcc-5, but I've been pleasantly surprised by the overall speed
of my desktop scripts (using -j4 -O for make, but not for the

If I'm going to use a system to measure packages for BLFS, I always
repeat the SBU calculation after it has booted.  In my latest
system, I'm not intending to use it to measure anything - I'll still
use 7.7 for that - but I reran the calculation anyway : it went from
158.268s (using 7.7 and a 4.1-rc kernel to 167.646s using itself and
4.0.1).  Don't be fooled by the 3 decimal places, on this machine
(which might be doing other things during the initial build) I would
regard a difference of less than 10 seconds as probably noise.

'top' is usually helpful in determining if the system is under
pressure (typically, swapping) - the current version is quite nice
once you've fixed up what it shows to be more like the older

Nanny Ogg usually went to bed early. After all, she was an old lady.
Sometimes she went to bed as early as 6 a.m.

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